BMW E92 335i N54 Injector Leakback Rough Idle Misfire
BMW
3 Series
2007
N54 3.0T 306PS
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
N54 injectors in E92 335i can develop leakback causing rough idle, hard start and P030X misfires. Injector leakback test identifies faulty units. Replacement injector costs £120-250 each. Always replace injector seals simultaneously.
Repair / Solution
No confirmed fixes yet. Share yours below.
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this BMW 3 Series 2007 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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