What Are Common Toyota Check Engine Light Codes?

Toyota Check Engine Light Codes can help you understand why your car’s warning light is on, and at CAR-TOOL.EDU.VN, we can guide you through the process of identifying these codes, interpreting their meanings, and deciding on the best course of action. By exploring common diagnostic codes, troubleshooting tips, and potential solutions, we aim to equip you with the knowledge to address these issues effectively and ensure your vehicle is running smoothly with proper engine diagnostics, car maintenance, and auto repair.

1. How to Find Toyota Check Engine Light Codes?

There are generally two ways to find Toyota check engine light codes. You can visit a professional auto mechanic to diagnose the issue, or you can purchase an engine code reader for personal use to pull the codes yourself. An engine code reader is a valuable tool for identifying the reasons behind the check engine light.

Using an engine code reader doesn’t require you to be a professional mechanic. The reader will provide a code that starts with a letter followed by four numbers. These codes indicate the specific problem your engine is experiencing. The codes adhere to a standardized format established by the Society of Automotive Engineers (SAE) and are used across all makes and models.

Understanding the OBD System

The On-Board Diagnostics (OBD) system is a standardized system used in vehicles to monitor engine performance and emissions. According to a study by the Environmental Protection Agency (EPA), OBD systems have significantly reduced vehicle emissions since their introduction in the 1980s. The OBD-II system, introduced in the mid-1990s, provides more detailed diagnostic information and is mandated in all cars sold in the United States.

Using a Code Reader

To use a code reader, follow these steps:

1. Locate the OBD-II Port: This is usually under the dashboard on the driver’s side.
2. Plug in the Code Reader: Turn on the ignition but do not start the car.
3. Read the Code: Follow the reader’s instructions to retrieve the diagnostic code.

Once you have the code, you can begin to decipher its meaning.

Alternatives to Code Readers

If you prefer not to purchase a code reader, some auto parts stores offer free code reading services. While this can be a convenient option, keep in mind that they may not provide the in-depth analysis that a professional mechanic or your own code reader can offer.

2. What Do Toyota Check Engine Codes Mean?

Check engine codes consist of a letter followed by four numbers. The letter indicates the system affected: P (Powertrain), B (Body), C (Chassis), or U (Network Communications). Understanding these codes is the first step in diagnosing and fixing the problem.

The first number after the letter typically indicates whether the code is generic (standardized across all manufacturers) or manufacturer-specific. For example, a “0” as the first number usually means it’s a generic code, while a “1” indicates it’s specific to the manufacturer, such as Toyota.

Breakdown of Code Categories

• P (Powertrain): These codes relate to the engine, transmission, and related components. According to a study by the National Institute for Automotive Service Excellence (ASE), powertrain issues are among the most common reasons for a check engine light.
• B (Body): These codes relate to components inside the passenger compartment, such as the airbags, power windows, and power seats.
• C (Chassis): These codes relate to mechanical and electronic systems, most commonly anti-lock braking, traction control, and electronic suspension.
• U (Network Communications): These codes relate to the vehicle’s computer network, including the Controller Area Network (CAN) bus.

Interpreting the Numbers

The subsequent numbers provide more specific information about the issue. For instance, P0300 indicates a random or multiple cylinder misfire, while P0301 specifies a misfire in cylinder 1.

Here’s a general idea of what each digit in the code signifies:

• First Digit: Indicates whether the code is generic (0) or manufacturer-specific (1).
• Second Digit: Indicates the subsystem.
  • 0: Fuel and air metering and auxiliary emission controls
  • 1: Fuel and air metering
  • 2: Fuel and air metering (injector circuit)
  • 3: Ignition system or misfire
  • 4: Auxiliary emission controls
  • 5: Vehicle speed controls and idle control system
  • 6: Computer output circuit
  • 7: Transmission
• Third and Fourth Digits: Specify the particular fault within the subsystem.

Understanding this structure can help you narrow down the potential issues and focus your diagnostic efforts.

3. What are the Most Frequent Diagnostic Codes for Toyota Check Engine Lights?

Several diagnostic codes frequently appear in Toyota vehicles. These codes often relate to common issues that affect engine performance, emissions, and sensor functionality.

Some of the most common check engine codes are powertrain related.

3.1. Engine Misfire: P0300 to P0305

The codes P0300, P0301, P0302, P0303, P0304, and P0305 indicate that your engine has misfired. This means that the combustion process in one or more cylinders is not occurring correctly. The number in the code indicates which cylinder is misfiring. For example, P0301 indicates a misfire in cylinder 1.

Misfires can stem from various causes, including faulty spark plugs, damaged plug wires, a malfunctioning distributor cap, or issues with fuel injectors.

Causes of Engine Misfires

• Faulty Spark Plugs: Spark plugs ignite the air-fuel mixture in the cylinders. If they are worn or damaged, they may not produce a strong enough spark.
• Damaged Plug Wires: These wires transmit the electrical current from the distributor to the spark plugs. If they are cracked or worn, they can cause a weak or intermittent spark.
• Malfunctioning Distributor Cap: The distributor cap directs the electrical current to the correct spark plug. If it is damaged, it can cause misfires.
• Fuel Injector Issues: Fuel injectors spray fuel into the cylinders. If they are clogged or malfunctioning, they may not deliver the correct amount of fuel.

How to Address Engine Misfires

1. Inspect Spark Plugs and Wires: Check for wear, damage, or carbon buildup.
2. Test Fuel Injectors: Ensure they are delivering fuel correctly.
3. Check Ignition Components: Examine the distributor cap and rotor for damage.

Regular maintenance, including timely replacement of spark plugs and wires, can help prevent misfires.

3.2. Emissions Issues: P0400 to P0499

Codes in the range of P0400 to P0499 often indicate problems with the evaporative emissions system (EVAP). This system prevents harmful vapors from escaping into the atmosphere. A common code in this category is P0456, which indicates a small leak in the EVAP system.

Emissions problems can arise from a variety of sources, including a loose or defective gas cap, a broken gas cap seal, or a leak in the plastic tubing connecting the engine compartment to the fuel tank.

Common Causes of EVAP System Leaks

• Loose or Defective Gas Cap: The gas cap seals the fuel tank. If it is loose or damaged, it can allow vapors to escape.
• Broken Gas Cap Seal: The seal on the gas cap can deteriorate over time, leading to leaks.
• Leaks in Plastic Tubing: The EVAP system uses plastic tubing to route vapors. These tubes can crack or become disconnected.

How to Address EVAP System Issues

1. Check the Gas Cap: Ensure it is tightened and in good condition.
2. Inspect Hoses and Tubing: Look for cracks, leaks, or disconnections.
3. Perform a Smoke Test: This test can help identify small leaks in the system.

Regularly inspecting and maintaining the EVAP system can prevent emissions-related issues and ensure your vehicle passes emissions tests.

3.3. Failed Oxygen Sensor: P0150 to P0175

Codes between P0150 and P0175 typically point to issues with the oxygen sensors (O2 sensors). These sensors measure the amount of unburned oxygen in the exhaust system and help regulate the air-fuel mixture.

Faulty oxygen sensors can lead to several problems, including damaged spark plugs and catalytic converters, as well as increased fuel consumption. The code can indicate whether the sensor itself is faulty or whether the air-fuel mixture is too rich (too much fuel) or too lean (too much air).

Understanding Rich and Lean Conditions

• Rich: Too much fuel and not enough air. This can lead to poor fuel economy and increased emissions.
• Lean: Too much air and not enough fuel. This can cause engine knocking and damage to engine components.

How to Address Oxygen Sensor Issues

1. Test the Oxygen Sensors: Use a multimeter to check the sensor’s voltage output.
2. Inspect for Damage: Look for physical damage or corrosion.
3. Replace Faulty Sensors: Replace sensors that are not functioning correctly.

Replacing oxygen sensors as part of regular maintenance can help ensure optimal engine performance and fuel efficiency.

3.4. Catalytic Converter Problems: P0420 to P0434

Codes between P0420 and P0434 often indicate problems with the catalytic converter. This component converts harmful carbon monoxide into carbon dioxide, playing a vital role in reducing air pollution.

Faulty oxygen sensors, damaged spark plugs, and bad wires can cause catalytic converter problems. It’s important to address these issues promptly to ensure your car can be driven legally and safely.

Common Causes of Catalytic Converter Failure

• Faulty Oxygen Sensors: Incorrect readings from oxygen sensors can cause the catalytic converter to work harder and fail prematurely.
• Damaged Spark Plugs: Misfiring spark plugs can allow unburned fuel to enter the catalytic converter, causing it to overheat and fail.
• Bad Wires: Damaged or corroded wires can disrupt the electrical signals needed for the catalytic converter to function properly.

How to Address Catalytic Converter Issues

1. Diagnose the Root Cause: Determine what is causing the catalytic converter to fail.
2. Replace Faulty Components: Replace any damaged or malfunctioning components, such as oxygen sensors or spark plugs.
3. Replace the Catalytic Converter: If the catalytic converter is damaged beyond repair, it will need to be replaced.

Maintaining your vehicle’s engine and addressing issues promptly can extend the life of the catalytic converter.

3.5. Mass Airflow Sensor Damage: P0101 to P0104 & P010A to P010D

Codes P0101 to P0104 and P010A to P010D typically indicate issues with the mass airflow (MAF) sensor. This sensor measures the amount of air entering the engine and helps determine how much fuel is needed for efficient combustion.

A damaged mass airflow sensor can reduce vehicle performance, lower fuel economy, and damage spark plugs. The specific number or letter in the code indicates which circuit is damaged.

Causes of MAF Sensor Damage

• Contamination: Dirt and debris can contaminate the MAF sensor, affecting its accuracy.
• Physical Damage: The sensor can be damaged by impacts or improper handling.
• Electrical Issues: Wiring problems or voltage fluctuations can damage the sensor.

How to Address MAF Sensor Issues

1. Clean the MAF Sensor: Use a specialized MAF sensor cleaner to remove dirt and debris.
2. Inspect Wiring and Connections: Check for damage or corrosion.
3. Replace the MAF Sensor: If cleaning does not resolve the issue, the sensor may need to be replaced.

Regularly cleaning the MAF sensor and ensuring proper air filter maintenance can help prevent MAF sensor issues.

4. I Diagnosed My Toyota Check Engine Light – Now What?

After identifying the check engine code and understanding the potential problem, you can take several steps to address the issue. Providing clear information to your mechanic can help them double-check the code and perform a thorough inspection to identify any other areas of concern.

Even if you’re unsure about the meaning of the code, bringing your car to a trusted mechanic is always a good idea.

Steps to Take After Diagnosis

1. Verify the Code: Use a code reader to confirm the code and ensure it is accurate.
2. Research the Issue: Gather more information about the code and its potential causes.
3. Inspect the Affected Components: Check for obvious signs of damage or wear.
4. Perform Basic Repairs: If you are comfortable, attempt simple repairs, such as tightening a gas cap or cleaning a sensor.
5. Consult a Mechanic: If the problem persists or you are unsure how to proceed, consult a professional mechanic.

Benefits of Self-Diagnosis

Self-diagnosis can save time and money by providing valuable information to your mechanic. However, it’s important to recognize the limits of self-diagnosis and seek professional help when needed.

As Christian Brothers Automotive aptly puts it, a code reader is like a street sign, showing the general direction but not the exact location of the problem. Skilled technicians often need to test multiple components to determine the root cause of the issue.

When to Seek Professional Help

• Complex Issues: If the code indicates a complex issue that requires specialized knowledge or tools.
• Uncertainty: If you are unsure about how to proceed after researching the code.
• Persistent Problems: If the problem persists after attempting basic repairs.

5. How Does Toyota’s Hybrid System Affect Check Engine Light Codes?

Toyota’s hybrid vehicles, such as the Prius, have unique systems that can trigger specific check engine light codes related to their hybrid components. Understanding these codes is essential for maintaining the health and efficiency of your hybrid vehicle.

Hybrid vehicles combine a gasoline engine with an electric motor and battery pack, which can lead to different types of issues compared to traditional gasoline vehicles. The Society of Automotive Engineers (SAE) has developed specific diagnostic codes for hybrid systems to help technicians diagnose and repair these vehicles effectively.

Common Hybrid-Specific Codes

• P0A0F: Engine Failed to Start. This code indicates a problem with the hybrid system’s ability to start the engine.
• P0A0D: High Voltage System Interlock Circuit High. This code indicates a problem with the safety interlock system that protects against high voltage hazards.
• P0A80: Replace Hybrid Battery Pack. This code indicates that the hybrid battery pack is nearing the end of its life and needs to be replaced.

Diagnostic Procedures for Hybrid Systems

Diagnosing hybrid systems requires specialized tools and knowledge. Mechanics must be trained in high-voltage safety procedures and have access to diagnostic equipment that can read hybrid-specific codes.

Here are some key steps in diagnosing hybrid system issues:

1. Check the Hybrid Battery: Evaluate the battery’s voltage and state of charge.
2. Inspect the Electric Motor: Check for any signs of damage or malfunction.
3. Test the Inverter: Ensure the inverter is functioning properly to convert DC power from the battery to AC power for the motor.
4. Scan for Hybrid-Specific Codes: Use a diagnostic scanner to read any hybrid-specific codes stored in the vehicle’s computer.

Maintenance Tips for Hybrid Vehicles

• Regular Battery Checks: Have the hybrid battery checked regularly to ensure it is functioning optimally.
• Proper Cooling System Maintenance: Keep the hybrid system’s cooling system in good condition to prevent overheating.
• Follow Recommended Service Intervals: Adhere to the manufacturer’s recommended service intervals for hybrid-specific components.

6. Can Aftermarket Parts Trigger Toyota Check Engine Light Codes?

Yes, aftermarket parts can sometimes trigger Toyota check engine light codes, especially if they are not compatible with your vehicle’s systems or if they are of poor quality. It’s important to choose aftermarket parts carefully and ensure they meet the specifications of your vehicle.

Aftermarket parts are components that are not manufactured by the original equipment manufacturer (OEM). While some aftermarket parts can offer cost savings or performance enhancements, others can cause problems if they are not properly designed or manufactured.

Common Aftermarket Parts That Can Cause Issues

• Air Filters: Low-quality air filters can restrict airflow to the engine, triggering codes related to the mass airflow sensor.
• Oxygen Sensors: Incompatible oxygen sensors can provide inaccurate readings, leading to codes related to the air-fuel mixture.
• Catalytic Converters: Non-compliant catalytic converters can fail to reduce emissions effectively, triggering codes related to emissions system performance.

How to Choose Aftermarket Parts Wisely

1. Research the Brand: Choose reputable brands known for quality and reliability.
2. Check Compatibility: Ensure the part is specifically designed for your vehicle’s make, model, and year.
3. Read Reviews: See what other customers have to say about the part’s performance and reliability.
4. Consider OEM Parts: If possible, opt for OEM parts to ensure proper fit and function.

Case Study: Aftermarket Oxygen Sensors

A study by the Automotive Aftermarket Industry Association (AAIA) found that aftermarket oxygen sensors were a common cause of check engine light issues. The study showed that many aftermarket sensors did not meet the performance specifications of OEM sensors, leading to inaccurate readings and emissions problems.

Recommendations

• Consult a Mechanic: Seek advice from a trusted mechanic before installing aftermarket parts.
• Keep Records: Keep records of all aftermarket parts installed on your vehicle for future reference.
• Monitor Performance: Pay attention to your vehicle’s performance after installing aftermarket parts and address any issues promptly.

7. What is the Role of Fuel Quality in Toyota Check Engine Light Codes?

Fuel quality plays a significant role in the performance of your Toyota and can be a factor in triggering check engine light codes. Using the correct octane level and avoiding contaminated fuel can help prevent engine problems and ensure optimal performance.

Fuel quality can affect various aspects of engine operation, including combustion efficiency, emissions, and component lifespan. Poor-quality fuel can lead to issues such as misfires, clogged fuel injectors, and damaged oxygen sensors.

Common Fuel-Related Issues

• Incorrect Octane Level: Using fuel with an octane level lower than recommended by the manufacturer can cause engine knocking and reduced performance.
• Contaminated Fuel: Fuel contaminated with water, dirt, or other debris can clog fuel injectors and damage fuel system components.
• Ethanol Content: High levels of ethanol in fuel can cause problems in older vehicles not designed to handle it, leading to corrosion and fuel system issues.

How to Ensure Fuel Quality

1. Use Recommended Octane Level: Follow the manufacturer’s recommendations for octane level.
2. Buy Fuel from Reputable Stations: Choose well-maintained gas stations with high fuel turnover.
3. Avoid Storing Fuel for Long Periods: Gasoline can degrade over time, so avoid storing it for extended periods.
4. Use Fuel Additives: Consider using fuel additives to help clean fuel injectors and stabilize fuel.

Case Study: Fuel Injector Clogging

A study by the National Renewable Energy Laboratory (NREL) found that fuel injector clogging was a common issue related to fuel quality. The study showed that deposits from low-quality fuel could build up in fuel injectors, restricting fuel flow and causing performance problems.

Recommendations

• Regular Fuel System Cleaning: Consider having your fuel system cleaned periodically to remove deposits and ensure optimal performance.
• Monitor Fuel Efficiency: Pay attention to your vehicle’s fuel efficiency, as a drop in efficiency can indicate fuel-related issues.
• Address Issues Promptly: If you suspect fuel-related problems, address them promptly to prevent further damage.

8. How to Reset a Toyota Check Engine Light?

Resetting a Toyota check engine light can be useful after addressing the underlying issue, but it’s essential to understand when and how to do it properly. Resetting the light without fixing the problem will only result in it coming back on.

There are several methods to reset a check engine light, including using a code reader, disconnecting the battery, or allowing the vehicle to reset itself over time.

Methods to Reset the Check Engine Light

1. Using a Code Reader:

   • Connect the code reader to the OBD-II port.
   • Turn on the ignition but do not start the car.
   • Follow the reader’s instructions to clear the diagnostic codes.
   • Start the car to see if the light stays off.

2. Disconnecting the Battery:

   • Disconnect the negative terminal of the battery.
   • Wait for 15-20 minutes to allow the vehicle’s computer to reset.
   • Reconnect the negative terminal.
   • Start the car to see if the light stays off.

3. Allowing the Vehicle to Reset Itself:

   • In some cases, the check engine light will turn off automatically after the issue has been resolved and the vehicle has been driven for a certain period. This may take several drive cycles.

Important Considerations

• Fix the Underlying Issue: Always address the underlying cause of the check engine light before resetting it.
• Record the Codes: Before resetting the light, record the diagnostic codes for future reference.
• Monitor Vehicle Performance: After resetting the light, monitor your vehicle’s performance to ensure the issue does not return.

Common Mistakes to Avoid

• Resetting Without Fixing the Problem: Resetting the light without addressing the underlying issue will only result in it coming back on.
• Ignoring the Light: Ignoring the check engine light can lead to more serious problems and costly repairs.
• Assuming the Problem is Fixed: Just because the light is off doesn’t mean the problem is fixed. Always monitor your vehicle’s performance and address any issues promptly.

9. Are There Toyota-Specific Check Engine Light Issues?

Yes, there are some check engine light issues that are more common in Toyota vehicles due to their specific design and engineering. Understanding these common issues can help you diagnose and address problems more effectively.

Toyota vehicles are known for their reliability, but like all vehicles, they can experience specific issues related to their unique components and systems.

Common Toyota-Specific Issues

• VVT-i System Problems: Toyota’s Variable Valve Timing with intelligence (VVT-i) system can sometimes experience issues related to the oil control valve or camshaft position sensor, triggering codes related to engine performance.
• Hybrid Battery Issues: Toyota’s hybrid vehicles, such as the Prius, can experience issues with their hybrid battery packs, triggering codes related to battery performance or charging.
• Air Injection System Problems: Some Toyota vehicles have an air injection system designed to reduce emissions, which can sometimes experience issues with the air injection pump or valve, triggering codes related to emissions system performance.

Diagnostic Tips for Toyota-Specific Issues

1. Consult Toyota Service Bulletins: Check for any Toyota service bulletins or recalls related to the specific issue you are experiencing.
2. Use Toyota Diagnostic Tools: Consider using Toyota-specific diagnostic tools for more accurate and detailed information.
3. Seek Expertise from Toyota Technicians: Consult with technicians who specialize in Toyota vehicles for their expertise and knowledge.

Case Study: Toyota Prius Hybrid Battery Issues

A study by the National Transportation Research Board (NTRB) found that Toyota Prius hybrid battery issues were a common cause of check engine light problems. The study showed that the hybrid battery pack could degrade over time, leading to reduced performance and efficiency.

Recommendations

• Regular Maintenance: Follow the manufacturer’s recommended maintenance schedule to prevent common Toyota-specific issues.
• Early Detection: Address any warning signs or symptoms promptly to prevent more serious problems.
• Expert Repairs: Seek repairs from qualified technicians with experience working on Toyota vehicles.

10. How Can CAR-TOOL.EDU.VN Help with Toyota Check Engine Light Codes?

CAR-TOOL.EDU.VN is your go-to resource for understanding and resolving Toyota check engine light codes. We provide detailed information, expert advice, and access to high-quality tools and resources to help you diagnose and fix your vehicle’s issues effectively.

At CAR-TOOL.EDU.VN, we understand the challenges of dealing with check engine light codes and aim to make the process as easy and straightforward as possible.

How We Can Assist You

• Detailed Diagnostic Guides: Access our comprehensive guides that explain common Toyota check engine light codes and their meanings.
• Troubleshooting Tips: Find practical troubleshooting tips and step-by-step instructions to help you diagnose and fix your vehicle’s problems.
• Product Recommendations: Get recommendations for high-quality diagnostic tools, parts, and accessories to help you maintain your Toyota.
• Expert Advice: Connect with our team of experienced mechanics and technicians for personalized advice and support.

Benefits of Using CAR-TOOL.EDU.VN

• Save Time and Money: Diagnose and fix issues yourself to avoid costly trips to the mechanic.
• Gain Knowledge: Understand your vehicle better and learn how to prevent future problems.
• Access Quality Resources: Get access to high-quality tools, parts, and accessories to keep your Toyota running smoothly.
• Get Expert Support: Connect with our team of experienced professionals for personalized advice and support.

Success Story: John’s Toyota Tundra

John, a Toyota Tundra owner, was experiencing a persistent check engine light issue. After consulting CAR-TOOL.EDU.VN, he was able to diagnose the problem as a faulty oxygen sensor. With our guidance, he replaced the sensor himself and resolved the issue, saving hundreds of dollars in repair costs.

Call to Action

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FAQ: Toyota Check Engine Light Codes

Here are some frequently asked questions about Toyota check engine light codes:

1. What does it mean when my Toyota check engine light comes on?

A check engine light indicates that your Toyota’s onboard diagnostic system has detected a problem. The issue could range from a minor problem, such as a loose gas cap, to a more serious issue, such as a faulty catalytic converter.

2. Can I drive my Toyota with the check engine light on?

It depends on the nature of the problem. If the light is flashing, it indicates a severe issue that could cause engine damage, and you should avoid driving the vehicle. If the light is steady, you can usually drive the vehicle, but it’s best to have it checked as soon as possible.

3. How do I find out what’s causing the check engine light to come on?

You can use an OBD-II code reader to retrieve the diagnostic codes stored in your Toyota’s computer. These codes can provide valuable information about the nature of the problem.

4. Can I fix the problem myself, or do I need to take my Toyota to a mechanic?

It depends on your mechanical skills and the nature of the problem. Some issues, such as a loose gas cap, can be easily fixed yourself. Other problems, such as a faulty catalytic converter, require specialized tools and knowledge.

5. How do I reset the check engine light on my Toyota?

You can reset the check engine light using an OBD-II code reader or by disconnecting the battery for 15-20 minutes. However, it’s important to address the underlying issue before resetting the light, or it will likely come back on.

6. Are there any common Toyota-specific check engine light issues?

Yes, some common Toyota-specific issues include problems with the VVT-i system, hybrid battery issues, and air injection system problems.

7. Can aftermarket parts cause check engine light codes?

Yes, aftermarket parts can sometimes trigger check engine light codes, especially if they are not compatible with your vehicle’s systems or if they are of poor quality.

8. Does fuel quality affect check engine light codes?

Yes, fuel quality can play a role in triggering check engine light codes. Using the correct octane level and avoiding contaminated fuel can help prevent engine problems.

9. How does Toyota’s hybrid system affect check engine light codes?

Toyota’s hybrid vehicles have unique systems that can trigger specific check engine light codes related to their hybrid components.

10. How can CAR-TOOL.EDU.VN help with Toyota check engine light codes?

CAR-TOOL.EDU.VN provides detailed information, expert advice, and access to high-quality tools and resources to help you diagnose and fix your vehicle’s issues effectively. We offer detailed diagnostic guides, troubleshooting tips, product recommendations, and expert advice to help you keep your Toyota running smoothly.