V90 Engine Running Rich

Hi, I'm having some issues with my 2018 Volvo V90 diesel. It feels like the engine is running way too rich. I've noticed a definite reduction in engine power, and the check engine light keeps popping on. The engine also runs a bit rough, and my fuel consumption has gone through the roof. Plus, there's some jerking when I accelerate. The car has 201064 km on it. Any ideas what could be causing this?

4 comment(s)

Running rich, eh? Hmm. Rough running and poor fuel economy could point to a few things. Have you checked the spark plugs? When was the last time the oxygen sensor was replaced? An issue with the intake manifold might also cause this. A defective injector could also be the culprit. Any recent work done?

Thanks for the reply! I haven't checked the spark plugs recently, but I had them replaced about 50,000 km ago. I'm not sure about the oxygen sensor. Is there an easy way to test the oxygen sensor or the injectors without special tools?

Testing the oxygen sensor or injectors properly usually needs diagnostic equipment. Given all the symptoms, and the mileage, a defective injector is a strong possibility. Could also be some other sensor giving wrong readings. At this point, it might be best to get it to a workshop for a proper diagnosis. Saves you potentially throwing parts at it.

Thanks, I appreciate the advice. I took it to the shop, and you were right - it was a defective injector. Got it replaced, and the total cost was 515€. Runs like new again!

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