Peugeot 407 Rich Mixture Error

I've got a 2007 Peugeot 407, gasoline engine, with 130773 km. I'm getting a mixture preparation error. Reduced power, check engine light, rough running, jerking during acceleration, and occasional stalling at idle. I've checked the MAF sensor and spark plugs, and visually inspected the intake manifold, but can't pinpoint it. Any ideas?

4 comment(s)

I had a similar issue with my 407. Check engine light, rough running... sounds familiar. Can you share the specific error codes? Also, any unusual fuel consumption?

I didn't record the exact code, but it indicated a rich mixture. Fuel consumption seems about 10% higher than usual. Based on your experience, any component you'd suspect?

A rich mixture and higher fuel consumption aligns with my experience. I'm hesitant to diagnose remotely, but my issue was a defective injector. Given the cost and complexity, I'd suggest a trusted mechanic for assessment. It was the most cost-effective route for me, costing 515€ after labor and VAT.

Thanks for the confirmation, I'll arrange a professional diagnosis. Injection valve issues seem likely based on your experience. Thanks again.

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