BMW 320i E90 N46B20 Valvetronic Eccentric Shaft Sensor
BMW
3 Series
2005
N46B20 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 eccentric shaft position sensor on N46B20 in E90 320i can fail causing rough idle and P1520. The sensor is inexpensive but access requires removing the intake manifold. Replacement costs £100-250.
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 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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