BMW 318i 320i E46 N42 N46 Valvetronic Motor Failure
BMW
3 Series
2001
N42/N46 1.8/2.0
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
The Valvetronic motor on N42/N46 engines in E46 318i/320i can fail causing rough idle, reduced power and P1520. Motor replacement costs £150-350 at an independent BMW specialist. Always check the Valvetronic eccentric shaft sensor before condemning the motor.
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 2001 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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