The P02B7: Cylinder 8 – Fuel Trim at Min Limit code indicates that the fuel trim for cylinder 8 has reached its minimum limit, meaning the engine control unit (ECU) is reducing the fuel delivery to cylinder 8 to its lowest possible level. This can be caused by a faulty fuel injector, restricted fuel delivery (from the fuel filter or fuel pump), or a malfunctioning fuel pressure regulator. Diagnosing and repairing this issue is important to prevent poor engine performance.
P02B7 – Quick Overview
Meaning | P02B7: Cylinder 8 – Fuel Trim at Min Limit |
Is it serious? | Yes, this code is serious and can cause engine misfires, poor performance, and reduced fuel efficiency if not addressed promptly. |
Possible causes | – Faulty fuel injector for cylinder 8 – Restricted fuel filter or fuel pump issues – Faulty fuel pressure regulator |
How to diagnose? | – Test the fuel injector for cylinder 8 – Inspect the fuel filter and fuel pump – Check the fuel pressure regulator |
P02B7 Meaning
The P02B7: Cylinder 8 – Fuel Trim at Min Limit code means that the ECU is minimizing fuel delivery to cylinder 8 in response to an air-fuel imbalance. This issue can result from a malfunctioning fuel injector, restricted fuel flow from a clogged fuel filter or a weak fuel pump, or a faulty fuel pressure regulator. If left unresolved, this condition can lead to engine misfires, rough idling, and reduced fuel efficiency.
Step-by-step diagnostic guide
Here’s how to troubleshoot and repair the P02B7 code:
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check for any additional related codes that may provide further information on the fuel system or injector issues. | OBD-II Scanner |
Test the Fuel Injector | Test the fuel injector for cylinder 8 to ensure it is delivering fuel properly. Replace it if clogged or malfunctioning. | Multimeter, Fuel Injector Tester |
Inspect the Fuel Filter | Check the fuel filter for clogs or restrictions that could be limiting fuel flow to cylinder 8. Replace the filter if necessary. | Fuel Filter Wrench, Replacement Filter |
Test the Fuel Pump | Inspect the fuel pump to ensure it is providing adequate fuel pressure. Replace the pump if it is not functioning properly. | Fuel Pressure Gauge, Multimeter |
Check the Fuel Pressure Regulator | Test the fuel pressure regulator to ensure it is maintaining proper fuel pressure. Replace if faulty. | Fuel Pressure Gauge, Replacement Regulator |
Repair/Replace Components | Replace any faulty components, such as the fuel injector, fuel filter, fuel pump, or pressure regulator, to restore proper fuel flow. | Replacement Parts, Basic Tools |
Clear Code and Test Drive | After repairs, clear the P02B7 code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle after the test drive to ensure the P02B7 code does not return. | OBD-II Scanner |
By following this step-by-step diagnostic guide, you can effectively troubleshoot and resolve the P02B7 code, ensuring proper fuel delivery to cylinder 8 and restoring engine performance.

Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)