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P034B

Crankshaft Position Sensor Crankshaft Direction Incorrect

Generic OBD-II

Common symptoms

What you'll notice

Common causes

Most likely first

  1. Faulty or malfunctioning crankshaft position sensor
  2. Misalignment or improper installation of the crankshaft position sensor
  3. Worn or damaged crankshaft sensor reluctor ring
  4. Wiring issues, such as broken or shorted wires, in the crankshaft position sensor circuit
  5. ECU (Engine Control Unit) software or programming issues related to the crankshaft position sensor

How to diagnose & fix

Work through it in order

  1. Engine misfires or stalls
  2. Difficulty starting the vehicle
  3. Engine running rough or vibrating
  4. Poor acceleration or loss of power
  5. Engine hesitation or surging

Read & clear P034B yourself

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