RCZ Diesel Engine Power Loss

I'm experiencing reduced engine power and a check engine light in my 2014 Peugeot RCZ diesel with 105,067 kilometers. The engine runs rough, and the car jerks when accelerating, sometimes stalling at idle. I suspect a mixture preparation error. Could a defective injection valve or injector be the problem? I've checked the intake manifold for leaks, but everything seems fine. Could it be the air-fuel ratio or throttle body? Any advice?

4 comment(s)

Sounds like a headache. Defective injectors are possible. I had a similar issue on my old car caused by a dodgy oxygen sensor messing with the air-fuel ratio. Have you checked the O2 sensor? Is the mixture too rich? Do you smell fuel?

I haven't checked the oxygen sensor yet. How would I determine if the mixture is too rich? I haven't noticed a distinct fuel smell. The car recently had an inspection where they checked the exhaust parameters.

If the car had an inspection recently and the exhaust was checked, the O2 sensor might be doing its job somewhat, but it doesn't mean it's perfect. Not smelling fuel might point away from a super rich mixture, but it's hard to say without proper diagnostics. Getting it hooked up to a diagnostic tool at a workshop would be wisest. They can pinpoint which injector or component is causing the issue. Saved me guesswork in the past!

I brought my RCZ to a local workshop, and it was indeed a defective injector. The repair cost me 515€, but the car is running smoothly again. I appreciate the quick responses and guidance!

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