viviendrache1

Peugeot 407 Lean Running Issue

My 2007 Peugeot 407 diesel engine is running lean. I'm seeing reduced power, a check engine light, rough running, and jerking when accelerating. Only 35934 km on the clock. Could a defective injector cause this?

A 2007 Peugeot 407 diesel engine is experiencing lean running issues, characterized by reduced power, a check engine light, rough running, and jerking during acceleration. The problem could be caused by defective fuel injectors, as confirmed by a workshop diagnosis. Replacing the injectors resolved the issue.

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4 comment(s)

I have a 407 with a similar diesel. Those symptoms are frustrating. When mine acted like that, the oxygen sensor and mass air flow sensor were the problem. Did you check those?

Thanks. When your car had these symptoms, did a diagnostic scan show a lean air-fuel ratio? Trying to figure out the most likely cause before I start fixing things.

Yes, the scan showed a persistent lean condition. I hoped it was something simple like spark plugs or cleaning the throttle body, but the lean running continued. With your symptoms and low mileage, a workshop might be best.

Thanks for the lean running advice. I took it to a workshop, and they confirmed defective fuel injectors. Replacing them fixed it, costing 515€. Thanks for sharing your experience.

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PEUGEOT

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407