P0312 MERCEDES-BENZ – Cylinder 12 Misfire Detected

 

P0312: DIY Repairing Video Tutorial

https://youtu.be/1lhSm0dZqGg

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0312 MERCEDES-BENZ Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),Lack/loss of power,Hard start,Engine hesitation  

P0312 MERCEDES-BENZ Possible Causes

  Faulty spark plug 12,Clogged or faulty fuel injector 12,Faulty ignition coil 12,Fuel injector 12 harness is open or shorted,Fuel injector 12 circuit poor electrical connection,Ignition coil 12 harness is open or shorted,Ignition coil 12 circuit poor electrical connection,Insufficient cylinder 12 compression,Incorrect fuel pressure,Intake air leak  

P0312 MERCEDES-BENZ Description

  When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.