P02B5
Cylinder 7 - Injector Leaking
Fuel injection
Generic OBD-II
High
What it means
P02B5 means the ECM has detected that cylinder 7's fuel injector is leaking — passing fuel when it should be closed. The extra fuel makes that cylinder run rich, so the engine idles rough, can be hard to start when warm, and may smell of fuel or show black smoke. It's a fuel-delivery fault on one injector, not a whole-engine no-start.
High
Can I keep driving? Usually drivable but rough — a leaking injector floods cylinder 7, causing hard starts and a rough idle. Fix it before it fouls the plug or damages the converter.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle, especially when hot
- Hard starting
- Fuel smell or black smoke and reduced economy
Common causes
Most likely first
- Leaking or stuck-open injector on cylinder 7Likely
- Worn injector seal or O-ring letting fuel weepCommon
- Debris on the injector seat holding it openCommon
- High fuel pressure worsening the leakLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check cylinder 7 fuel trims for a rich bias.
- Inspect the cylinder 7 injector for dripping or a fouled/wet plug.
- Perform an injector leak-down or flow test and compare with the other injectors.
- Replace the leaking injector (and its seals); clear the code and re-test.
- Confirm fuel pressure is within spec so a new injector isn't overwhelmed.
FAQ
Quick answers
Is it safe to drive with P02B5?+
Briefly — but a leaking injector washes oil off the cylinder walls and can foul the plug and overheat the converter. Repair it soon.
Can I just clear P02B5?+
It returns while the injector keeps leaking. The injector has to be tested and replaced for the code to stay off.
Related codes
Often seen with P02B5
Read & clear P02B5 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX