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p0340
Moderate
BMW · Sedans
Camshaft Position Sensor A Circuit Malfunction Bank 1
Quick Answer
Error code P0340 on your BMW Sedans means: Camshaft Position Sensor A Circuit Malfunction Bank 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
330i530i540i740i760i330e 2024330i xDrive 2024530i 2024530i xDrive 2024540i xDrive 2024545e xDrive 2024740i 2024740i xDrive 2024760i xDrive 2024M3 CS 2024M3 Competition 2024M3 Competition xDrive 2024M340i xDrive 2024i4 M50 2024i4 eDrive35 2024i4 eDrive40 2024M3M340ii4i5
Likely Causes
  1. Faulty camshaft position sensor
  2. Damaged wiring harness to the sensor
  3. Corroded or loose sensor connector
  4. Stretched or jumped timing chain
  5. Failed VANOS solenoid affecting camshaft timing signal
How to Fix It
1
Inspect camshaft position sensor connector and wiring for damage
2
Test camshaft position sensor signal with an oscilloscope or scan tool
3
Check timing chain tension and alignment marks
4
Replace camshaft position sensor if faulty
5
Clear codes and verify proper engine timing
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Camshaft position sensor
Sensor connector
Timing chain kit
Related Error Codes
P0171P0174P0300P0335P0420
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