GoosenTB

Hi All, I urgently need your advice please. I have 2011 (w204) C-180 CGI. Car drives fine except when I hard accelerate on an incline, it will hesitate and jerk, when I leave the accelerator and then gently accelerate again its fine. I get no engine lights on my dash. When connected to my OBD scanner, I get an P2339 Error Cylinder 4 above threshold, problem with device ignition. Any advice ?

gamma300C

My quick reply via personal P2339 code experience on a C300 (2009) was a failing fuel injector..a PCM problem usually sets the CEL. The code is usually from a lean mixture induced knock. Trying several bottles of Techron fuel injector cleaner "may" cure but more likely a new injector (fairly cheap on eBay, other sources) is better solution after confirming #4 injector connector/wiring intact. YouTube a video to see how to /removereplace your injectors..might even want to practice by changing #4 injector to another cylinder and see if code follows that switch. Misfires from bad plugs usually cause a P030X code.

Good Luck

GoosenTB

Thank you for your advice I will definitely have the injectors tested.