OBD-II code · Powertrain (generic)
P02AC Cylinder 5 - Injector Restricted
Cylinder 5 injector flow restricted — partial blockage detected. A flow-deviating injector throws off cylinder balance — adjacent cylinders run leaner/richer to compensate, often masking the root cause until the trim limit is hit.
Is it safe to drive with P02AC?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInjector nozzle clogged
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Injector
Related codes
- P029CCylinder 1 - Injector Restricted
- P02A0Cylinder 2 - Injector Restricted
- P02A4Cylinder 3 - Injector Restricted
- P02A8Cylinder 4 - Injector Restricted
- P02B0Cylinder 6 - Injector Restricted
- P02B4Cylinder 7 - Injector Restricted
- P02B8Cylinder 8 - Injector Restricted
- P02BCCylinder 9 - Injector Restricted
- P02C0Cylinder 10 - Injector Restricted
- P02C4Cylinder 11 - Injector Restricted
- P02C8Cylinder 12 - Injector Restricted
- P02A9Cylinder 4 - Injector Leaking
- P02AACylinder 5 - Fuel Trim at Max Limit
- P02ABCylinder 5 - Fuel Trim at Min Limit
- P02ADCylinder 5 - Injector Leaking
- P02AECylinder 6 - Fuel Trim at Max Limit
- P02AFCylinder 6 - Fuel Trim at Min Limit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.