The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0343.
DTC/P0343·BMW
P0343 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeverityNot safe to driveBMW
P0343 on a BMW means the camshaft position sensor signal voltage is higher than the ECU expects. This usually happens when the signal wire is open (broken), the sensor coil has failed open, the connector has lost contact, or the signal wire has shorted to a 12 V power source. P0343 is the inverse of P0342 and points to wiring or sensor faults rather than mechanical timing problems.
Typical repair cost, all makes€25 - €350
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BMW 3 Series
2006-2024N52 and N55 3 Series can set P0343 after the intake or exhaust cam sensor fails open. The sensors are sensitive to oil contamination from a leaking cam cover gasket, which is a routine N52 wear item. Replacing the gasket at the same time prevents repeat failures.
What causes P0343 on a BMW?
Beyond the generic causes listed on the main P0343 page, these are the patterns noted for BMW models:
BMW 3 SeriesCam sensor open coil failure on N52/N55
BMW 3 SeriesConnector contamination from leaking cam cover gasket
How to diagnose P0343 on a BMW with OBD2
Follow these steps to pinpoint the root cause of P0343:
- Read freeze-frame data and confirm whether P0343 sets at cranking, at idle, or only after warm-up. Heat-soak-only failures often indicate a degrading sensor
- Inspect the sensor connector for full seating and signs of oil or coolant intrusion
- Unplug the sensor and check resistance across its terminals if magnetic, or verify 5 V reference and ground if Hall-effect. An infinite resistance reading confirms an open coil
- Check continuity of the signal wire from the sensor connector to the ECU pin. An open in the wire produces P0343 even with a healthy sensor
- With ignition on and sensor unplugged, measure voltage on each pin. A constant 12 V reading on the signal pin indicates a wire shorted to power
How much does P0343 cost to fix on a BMW? (EUR)
Estimated repair costs for P0343 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0343
These codes are often seen alongside P0343 or point to related issues, on any make:
Looking for the full P0343 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0343 guideSkanyx · BMW
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