jamesjung1

Modus Diesel Engine Power Loss

My 2010 Renault Modus diesel has a significant reduction in engine power and the check engine light is on. It's done 205338 km. The engine runs roughly, and the car jerks when accelerating. Plus, the engine stalls at idle. Could this be a mixture preparation error?

A 2010 Renault Modus diesel is experiencing significant engine power loss, rough running, jerking during acceleration, and stalling at idle, with the check engine light on. Possible causes include a mixture preparation error, potentially due to a faulty oxygen sensor or issues with the fuel injection system. Suggested solutions involve checking the oxygen sensor with a multimeter and inspecting the fuel injectors, with a recommendation to visit a workshop for a thorough diagnosis. The workshop confirmed a defective injector, leading to a repair.

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4 comment(s)

Hey! That sounds frustrating. A mixture preparation error could be caused by a few things. Have you checked the oxygen sensor? A faulty one can really mess with the air-fuel ratio. It could also be related to your fuel injection system. Is the exhaust smelling particularly rich? When was the last time you changed your spark plugs? Although, on a diesel it's glow plugs we should be looking at. These can impact mixture and running if they're not performing well!

Thanks for the suggestions. Is there a way to test the oxygen sensor without specialized equipment? Also, if the fuel injection system is the problem, what specific components should I check first?

Testing the oxygen sensor properly usually needs a multimeter to check the voltage output – not super specialized, but you need the tool. As for the fuel injection, that's trickier. Given all the symptoms, especially the stalling, combined with the mileage, a defective injector is a prime suspect. Honestly, with those symptoms, you're probably best off taking it to a workshop before you end up causing more damage!

Thanks for the advice. I took the car to a local workshop based on your recommendation. They confirmed that the injector was defective. The repair cost came to 515€.

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RENAULT

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MODUS