Jumpy runs rich

I've got a 2009 Citroen Jumpy, gasoline engine, with about 99500 km on it. Lately, it's been acting up. I think it runs too rich, like it's getting way too much fuel. I've noticed the engine power is down, and the check engine light is on constantly. It runs rough, my fuel economy has tanked, and it even jerks sometimes when I accelerate. I've checked the spark plugs, and they look ok. What could it be?

4 comment(s)

That sounds familiar. I also own a Citroen Jumpy. Reduced engine power, rough running, check engine light... Did you perhaps check the oxygen sensor? Is it possible that it's malfunctioning and causing the air-fuel ratio to be off?

Oxygen sensor, huh? I haven't checked that specifically. Where exactly is that located, and is it something I can test myself without special tools? Is it likely that the oxygen sensor causes all these problems?

The oxygen sensor is usually located in the exhaust system, before or after the catalytic converter. Honestly, without the proper equipment, testing it can be tricky. Since you have so many symptoms, including the check engine light, I would recommend a visit to a workshop. They can properly diagnose it and check if the injection valve is defective as well.

Okay, thanks for the advice. I took it to the workshop, and you were right - it was a defective injection valve/injector issue causing the rich mixture. Repair cost was 515€. Appreciate the help!

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