OBD-II code · Powertrain (generic)
P02A8 Cylinder 4 - Injector Restricted
Cylinder 4 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 P02A8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInjector clogged
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Injector Cyl4
Related codes
- P029CCylinder 1 - Injector Restricted
- P02A0Cylinder 2 - Injector Restricted
- P02A4Cylinder 3 - Injector Restricted
- P02ACCylinder 5 - 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
- P02A5Cylinder 3 - Injector Leaking
- P02A6Cylinder 4 - Fuel Trim at Max Limit
- P02A7Cylinder 4 - Fuel Trim at Min Limit
- P02A9Cylinder 4 - Injector Leaking
- P02AACylinder 5 - Fuel Trim at Max Limit
- P02ABCylinder 5 - Fuel Trim at Min Limit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.