VelSatis diesel engine power loss

I'm having issues with my 2003 Renault VelSatis diesel. It has 184148 km on it. I've noticed a significant reduction in engine power recently. The check engine light is on, and the engine is running rough, particularly at idle. Fuel consumption has also increased, and there is a jerking sensation when accelerating. I suspect the engine is running too rich. I already replaced the air filter, but it didn't help. Could this be a defective injection valve or injector?

4 comment(s)

I had a similar issue with my 2011 Opel Insignia, also a diesel. Reduced power and the check engine light were the first signs. I never checked the air filter on mine. Is the rough running consistent, or only under certain conditions?

The rough running is more pronounced when the engine is cold, but it persists even when the engine is warm. The jerking is most noticeable under acceleration, especially in lower gears. Did your Opel Insignia exhibit similar behavior? What was the eventual cause of the problem?

Yes, the symptoms you describe are very similar to what I experienced. Given the age of your VelSatis and the mileage, a faulty injector is a strong possibility. I recommend that you have the injection system professionally diagnosed. It could be a simple fix, or it could be more involved. I ended up taking mine to the workshop because I don't have the skills to repair it myself.

Thanks for the advice. I took the VelSatis to a workshop. After diagnosis, they confirmed that an injector was defective and replaced it. The total cost was 515€. The engine now runs smoothly, and the check engine light is off.

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