Insignia Reduced Power Rough Running

My 2017 Vauxhall Insignia with a diesel engine is giving me fits. Only 25756 km on the clock! The check engine light is on, and I'm getting reduced power, rough running, and even some smoke when I accelerate. It's also hissing loudly and jerking. Fuel consumption is way up too! Could this be a vacuum leak, or is it something more sinister?

4 comment(s)

Those symptoms do sound concerning. Has the check engine light given you any specific error codes? Reduced power and rough running, combined with smoke, could point to a few things. Is it possible the EGR valve is at fault?

Error codes? I haven't checked those, but wouldn't a defective EGR valve cause all these problems? I mean, is it common for those to fail on a gasoline engine? Are these symptoms typical of an EGR valve issue, or could it be something else entirely?

While other issues could present similarly, your symptoms are consistent with a failing EGR valve, especially the reduced power and rough running. The error code would confirm this diagnosis. Considering the symptoms, it is prudent to have a workshop check it out.

I took it to the workshop, and you were spot on. It was the EGR valve, jammed solid! Repair cost me 355€. Runs like new now. Appreciate the advice!

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