Cause
Clogged fuel injectors
Deposits narrowing the spray holes, reducing delivery and spoiling the spray pattern. The engine compensates until it cannot, so the complaint is normally poor running under load with an acceptable idle, plus lean indications on the affected bank.
Typically a moderate job.
Some of these codes mean you should stop driving
25 of the 69 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (69)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0171 System Too Lean — Bank 1 Likely for this code High
- P0263 Cylinder 1 Contribution/Balance Likely for this code Stop driving High
- P0266 Cylinder 2 Contribution/Balance Likely for this code Stop driving High
- P0269 Cylinder 3 Contribution/Balance Likely for this code Stop driving High
- P0272 Cylinder 4 Contribution/Balance Likely for this code Stop driving High
- P0275 Cylinder 5 Contribution/Balance Likely for this code Stop driving High
- P0278 Cylinder 6 Contribution/Balance Likely for this code Stop driving High
- P0281 Cylinder 7 Contribution/Balance Likely for this code Stop driving High
- P0284 Cylinder 8 Contribution/Balance Likely for this code Stop driving High
- P0287 Cylinder 9 Contribution/Balance Likely for this code Stop driving High
- P0290 Cylinder 10 Contribution/Balance Likely for this code Stop driving High
- P0293 Cylinder 11 Contribution/Balance Likely for this code Stop driving High
- P0296 Cylinder 12 Contribution/Balance Likely for this code Stop driving High
- P0301 Cylinder 1 Misfire Detected Likely for this code Stop driving High
- P0302 Cylinder 2 Misfire Detected Likely for this code Stop driving High
- P0303 Cylinder 3 Misfire Detected Likely for this code Stop driving High
- P0304 Cylinder 4 Misfire Detected Likely for this code Stop driving High
- P0305 Cylinder 5 Misfire Detected Likely for this code Stop driving High
- P0306 Cylinder 6 Misfire Detected Likely for this code Stop driving High
- P0307 Cylinder 7 Misfire Detected Likely for this code Stop driving High
- P0308 Cylinder 8 Misfire Detected Likely for this code Stop driving High
- P0309 Cylinder 9 Misfire Detected Likely for this code Stop driving High
- P0310 Cylinder 10 Misfire Detected Likely for this code Stop driving High
- P0311 Cylinder 11 Misfire Detected Likely for this code Stop driving High
- P0312 Cylinder 12 Misfire Detected Likely for this code Stop driving High
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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