Peugeot 4007 Lean Running Engine

I drive a 4007 as well, and your description sounds awfully familiar. I had similar symptoms: loss of power, rough idling, and the check engine light was on constantly. Have you checked the mass air flow sensor or the throttle body for any obstructions or malfunctions? Also, it might be worth investigating the oxygen sensor, as it plays a vital role in maintaining the correct air-fuel ratio.

Thanks. I haven't examined the mass air flow sensor or throttle body specifically. Did your issue present with similar jerking during acceleration? Were there any specific diagnostic codes when the check engine light was on? Any further details?

Yes, the jerking was definitely there, especially when trying to accelerate quickly. It felt like the engine was hesitating. I remember the diagnostic codes pointed towards a lean mixture. I initially tried cleaning the sensors, but the problem persisted. Eventually, I had to take it to a workshop. Considering the symptoms and potential for further damage to the catalytic converter, professional diagnosis is advisable.

Appreciate the feedback. Based on your advice and the potential complexities, I'll schedule an appointment with a trusted workshop for a comprehensive diagnosis and repair. It seems likely the injectors are at fault. The repair set me back 515€, but at least it's running smoothly now.