Cylinder 7 Injector Leaking
The P02B5 code indicates that the engine control module (ECM) has detected a leak in the fuel injector for cylinder 7. This can cause an overly rich fuel mixture in that cylinder, leading to misfires, reduced fuel economy, and potential damage to the catalytic converter or engine. The leak may be internal (dripping into the cylinder) or external (fuel leaking from the injector body).
01. Most Common Causes
- Faulty fuel injector (stuck open or leaking internally)
- Damaged injector O-ring or seal
- Cracked injector body or fuel rail
- Contaminated fuel causing injector sticking
02. Symptoms You Will Notice
- Check Engine Light on
- Rough idle or misfire from cylinder 7
- Strong fuel smell from exhaust or engine bay
- Decreased fuel economy
- Possible fuel leak visible near injector
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P02B5.
Step 2: Perform a visual inspection of injector 7 for external leaks or damage.
Step 3: Use a fuel pressure gauge to check for pressure drop after engine shutoff (indicates leaking injector).
Step 4: Swap injector 7 with another cylinder and see if the code follows the injector.
Step 5: If no external leak, perform a cylinder contribution test or injector balance test with a scan tool.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. A leaking injector can cause misfires, damage the catalytic converter, and create a fire hazard if fuel leaks externally.
How much does it cost to fix?▼
Replacing a single fuel injector typically costs $200-$600 including parts and labor, depending on vehicle make and accessibility.