What is OBD-II Code P02AF – Cylinder 6 – Fuel Trim at Min Limit

What is OBD-II Code P02AF – Cylinder 6 – Fuel Trim at Min Limit

If you have a warning light on your dashboard, it can be alarming and confusing, especially if you’re not familiar with the car’s systems. OBD-II codes are the language of the car’s computer, and they provide insight into the cause of the malfunction. Today, we will dive into one of the most common OBD-II codes, P02AF – Cylinder 6 – Fuel Trim at Min Limit, and explain what it is, the symptoms that come with it, and how to fix it.

What is OBD-II Code P02AF- Cylinder 6 – Fuel Trim at Min Limit?

The OBD-II code P02AF means that there is a problem with the fuel trim of a specific cylinder in your engine. In particular, it refers to Cylinder 6, which is one of the cylinders in a V6 engine. The fuel trim is the ratio of fuel to air that is required for the engine to run properly. When it is at “min limit,” it means there is not enough fuel for the engine to run at its optimal level. So, P02AF refers to a problem with this ratio in Cylinder 6.

Symptoms of OBD-II Code P02AF- Cylinder 6 – Fuel Trim at Min Limit

While the check engine light will be illuminated, there are other symptoms that may come with Code P02AF. These may include rough idling, a misfire, a decrease in fuel efficiency, reduced engine power, and difficulty starting the vehicle. You may also notice that your engine runs hotter than usual or that there is a stronger smell of fuel from the exhaust.

Causes of OBD-II Code P02AF- Cylinder 6 – Fuel Trim at Min Limit

There are several reasons why the fuel trim ratio in Cylinder 6 may be below the minimum limit. Some of these causes may overlap, and a proper diagnosis should be conducted to ensure the correct problem is identified.

1. Faulty fuel injector – An issue with the fuel injector in cylinder 6 can affect the fuel supply to that specific cylinder.

2. Vacuum leaks – Air infiltration into the engine can upset the air/fuel ratio, and consequently, the fuel trim.

3. Malfunctioning oxygen sensor – The oxygen sensor is responsible for detecting the oxygen levels in the engine and adjusting the fuel trim accordingly.

4. Defective mass airflow sensor – This sensor is used to calculate the amount of air coming into the engine, so if it malfunctions, it can affect the fuel trim ratio.

5. Clogged fuel filter – The fuel filter is responsible for removing impurities from the fuel before it gets to the engine. If it becomes clogged, the flow of fuel will be affected.

How to Fix OBD-II Code P02AF- Cylinder 6 – Fuel Trim at Min Limit

Once a diagnosis has been made, the following remedies may be applied.

1. Replace the fuel injector – If the fuel injector is the issue, it is best to replace it with a new one. If it is not practical to replace just one fuel injector, then it is best to replace them all at the same time.

2. Fix the vacuum leaks – Finding and repairing any leaks is essential to ensure that the air/fuel ratio is not affected.

3. Replace the oxygen sensor – A malfunctioning oxygen sensor can cause too much or too little fuel to be delivered to the engine. A new sensor should be installed to restore the balance.

4. Replace the mass airflow sensor – Similar to the oxygen sensor, a malfunctioning mass airflow sensor can cause the incorrect air/fuel ratio. A new sensor can restore proper function.

5. Replace the fuel filter – Lastly, if the fuel filter is clogged, it will need to be replaced. This will ensure the fuel system can effectively deliver the necessary fuel to the engine.

Frequently Asked Questions

1. What happens if I don’t fix OBD-II code P02AF?

Ignoring OBD-II code P02AF can lead to reduced engine performance, degraded fuel efficiency, and an increase in emission levels, which might lead to issues during emissions testing.

2. What happens if I drive with code P02AF

Code P02AF can cause your vehicle to run rough, have a loss of power, and emit harmful pollutants. It is not advisable to drive with this code, so it needs to be resolved as soon as possible.

3. Can I fix code P02AF myself?

While some fixes can be done, it is best left to professionals. Diagnosing the problem may require specialized diagnostic tools, and this code may indicate a more serious problem.

4. Will P02AF automatically clear itself?

OBD-II codes don’t clear themselves unless the root cause of the issue is fixed. After fixing the problem, you will need to clear the code, which can be done with an OBD-II scanner.

5. How much does it cost to fix code P02AF?

The cost to fix code P02AF can vary greatly depending on the cause of the problem. Some fixes such as a clogged fuel filter can be as low as $50. However, some fixes may be more expensive, with fuel injector replacements costing upwards of $500.


OBD-II code P02AF is a common code that indicates a problem with the fuel trim in Cylinder 6 of the engine. Identifying and resolving the problem is vital for the proper functioning of the engine, as well as for improved fuel efficiency and lower emissions. A competent mechanic should be able to identify and troubleshoot the issue and provide a reasonable cost for the repair. It is best to address this problem immediately to avoid added costs related to decreased efficiency and damage to other parts of the engine.

Scroll to Top