What is OBD-II Code P02B0 – Cylinder 6 – Injector Restricted

What is OBD-II Code P02B0 – Cylinder 6 – Injector Restricted

As a mechanic, dealing with OBD codes is an everyday activity. However, for the average person who may not have much technical knowledge about cars, these codes can be overwhelming and confusing. Understanding what specific codes mean is important in troubleshooting and identifying problems in the vehicle. One such code is OBD-II Code P02B0 – Cylinder 6 – Injector Restricted. In this article, we will explain what this code means and provide steps on how to repair the issue.

OBD-II Code P02B0 Definition

OBD stands for On-Board Diagnostics. The OBD system is responsible for monitoring the health and performance of the vehicle’s engine and emissions control systems. The OBD system is capable of detecting faults and storing Diagnostic Trouble Codes (DTCs) to help mechanics diagnose and repair issues in the vehicle. OBD-II Code P02B0 is one of these diagnostic trouble codes. It is a generic code that is defined as “Cylinder 6 – Injector Restricted,” indicating that there is a problem with the fuel injector in cylinder 6.

Causes of OBD-II Code P02B0

1. Dirty or Clogged Fuel Injector – Over time, the fuel injector can accumulate dirt, varnish, and other debris that can clog the nozzle, reducing fuel flow to the cylinder.

2. Faulty Fuel Injector – Fuel injectors can also fail due to wear and tear or electrical problems. A short circuit in the injector can also result in a restricted flow of fuel to the cylinder.

3. Fuel System Issue – The fuel system can also cause injector issues, including low fuel pressure or a malfunctioning fuel pump. Poor fuel quality, like dirty or contaminated fuel, can also lead to restricted fuel flow.

Symptoms of OBD-II Code P02B0

There are several symptoms that can be experienced when OBD-II Code P02B0 arises. These symptoms can result in poor engine performance, fuel economy, and emissions. The following are some of the symptoms that may be experienced when this code is present:

1. Check Engine Light (CEL) – The appearance of the check engine light is often the first symptom of OBD-II Code P02B0. The light indicates that the computer has detected a problem with the fuel injector in cylinder 6.

2. Rough Idle – A clogged or faulty fuel injector can result in an engine misfire. This misfire can cause the engine to shake or vibrate while idling.

3. Reduced Power – Restricted fuel flow to cylinder six can result in reduced power as the engine struggles to keep up with demand. Acceleration may be sluggish, and the vehicle may stall at times.

4. Poor Fuel Economy – If the fuel injector is not working correctly, the engine may use more fuel than necessary, resulting in poor fuel economy.

5. Emissions Issues – Emissions control systems could be affected by a restricted fuel injector, resulting in increased emissions that will trigger a failed emissions test.

How to Repair OBD-II Code P02B0

Repairing OBD-II Code P02B0 involves identifying and addressing the root cause of the issue. The following are steps that a mechanic can take to repair this code:

1. Check for Other Codes – It is essential to check for other diagnostic trouble codes that could be related to injector problems. This may include issues with fuel pressure or injector wiring.

2. Test Cylinder Six Injector – A mechanic will use a scan tool to test the fuel injector’s electrical system, fuel pressure, and spray pattern of the fuel injector to determine whether the injector is the issue.

3. Remove and Clean or Replace the Fuel Injector – If the fuel injector is found to be restricted or faulty, it may be necessary to remove and clean or replace the fuel injector to ensure proper fuel flow to cylinder 6.

4. Check the Fuel Delivery System – After cleaning, or replacement of the fuel injector, it is vital to check the entire fuel delivery system to ensure it is functioning correctly. This includes checking fuel pressure, fuel lines, fuel pump, and fuel filter.

5. Road Test – Finally, it is essential to road test the vehicle to ensure the repair addressed the issue successfully. The check engine light should turn off after the repair.


Q: Can OBD-II Code P02B0 be ignored?
A: No, this code should not be ignored, as it can result in engine damage, reduced fuel economy, and increased emissions.

Q: Can I repair OBD-II Code P02B0 myself?
A: Unless you have experience working with fuel systems, we highly recommend leaving the repair of this code to a qualified mechanic.

Q: How long does it take to repair OBD-II Code P02B0?
A: The time it takes to repair this code will depend on the root cause of the problem. However, it typically takes a few hours for a mechanic to diagnose and repair the issue.

Q: How can I prevent my fuel injector from clogging or becoming restricted?
A: Regular maintenance is essential to keeping the fuel injector clean and functional. This includes using high-quality gasoline, changing the fuel filter regularly, and having the fuel system cleaned by a professional mechanic at least once a year.

Q: Will OBD-II Code P02B0 automatically reset after the issue is fixed?
A: Once the issue causing the code is fixed, the code will automatically reset when the check engine light resets.


OBD-II Code P02B0 is a diagnostic trouble code that indicates a problem with the fuel injector in cylinder 6. This article has outlined the causes, symptoms, and steps for repairing the issue. By understanding these factors, vehicle owners can take the appropriate steps to repair the problem and prevent it from happening in the future. Regular maintenance and servicing of the fuel system can also prevent injector-related problems. So, if you ever face OBD-II Code P02B0, now you know what steps to take to fix the condition.

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