Canyon Diesel Jerking: Fuel Injector vs O2 Sensor Issue

Having experienced similar symptoms with my 2018 GMC Sierra diesel, I can relate to your situation. When my truck showed these exact symptoms, check engine light and jerking during acceleration, it turned out to be a faulty oxygen sensor combined with a partially clogged fuel injector. The rough idle and acceleration issues are classic indicators of either fuel delivery problems or sensor malfunctions. In my case, carbon deposits had built up in the fuel injector, and the oxygen sensor was providing incorrect readings to the engine control unit. The repair required: Cleaning of fuel injectors, Replacement of the oxygen sensor, Full diagnostic scan to ensure no other systems were affected This was a serious issue that needed immediate attention, as continuing to drive with these symptoms could have led to decreased fuel efficiency and potential damage to the catalytic converter. When discussing with a mechanic, request they specifically: Check fuel pressure readings, Test all oxygen sensor signals, Perform a complete fuel system diagnosis, Verify the exhaust system for any leaks The symptoms you describe strongly suggest either fuel delivery issues or sensor problems, both of which require professional diagnosis and repair.

Thanks for sharing your experience with the Sierra diesel. I had almost the same problem last year with my Canyon, jerking and rough acceleration. The mechanic found issues with both the fuel injectors and crankshaft sensor. The repair restored smooth operation but it wasnt cheap. Did you remember how much you ended up paying for the repairs? Also curious if youve had any similar issues pop up since getting it fixed?

Glad to provide an update on my Sierra repair situation. The initial symptoms were completely resolved after the mechanic found and fixed a significant leak in the exhaust system, which was causing incorrect readings from the oxygen sensor. The repair cost came to 265 Euro, which included a full diagnostic check. Since the repair, the rough idle issue has completely disappeared and the engine runs smoothly during acceleration. The check engine light hasnt come back on either. Its been running great for several months now with no signs of the previous problems returning. The exhaust leak was actually causing the oxygen sensor to send false readings to the engine control unit, which explains why the engine performance was so inconsistent. Getting it fixed by a qualified mechanic was definitely worth the investment in preventing further issues down the line. Would suggest having your fuel system checked regularly though, proper maintenance can help avoid these problems from developing in the first place.

The mechanic I went to found that my fuel injectors were indeed clogged and also discovered a failing ignition coil that was contributing to the engine misfire. Total cost ended up being 780 Euro for parts and labor. The engine runs perfectly smooth now with no jerking during acceleration. Really glad I got it checked out when I did. The mechanic mentioned that continued driving with these issues could have caused more expensive damage. No problems since the repair job three months ago, no check engine light and the rough idle is completely gone. Made sure to find a certified diesel specialist this time after my previous bad experience. The detailed inspection and clear explanation of the problems made a big difference in feeling confident about the repairs.