Code : P0309
Make : MERCEDES-BENZ
Description : P0309 MERCEDES-BENZ Cylinder 9 Misfire Detected
Possible causes :
– Faulty spark plug 9
– Clogged or faulty fuel injector 9
– Faulty ignition coil 9
– Fuel injector 9 harness is open or shorted
– Fuel injector 9 circuit poor electrical connection
– Ignition coil 9 harness is open or shorted
– Ignition coil 9 circuit poor electr
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.
