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Rifter Exhaust Treatment Malfunction

My 2023 Peugeot Rifter, gasoline engine, has developed an exhaust treatment malfunction. The check engine light is on, engine runs rough, I can smell exhaust fumes, and there seems to be a leak somewhere in the exhaust system. Mileage is 113561 km. Any ideas before I start tearing things apart?

A 2023 Peugeot Rifter with a gasoline engine developed an exhaust treatment malfunction, indicated by a check engine light, rough engine performance, exhaust fumes, and a suspected exhaust leak. The issue was potentially linked to a faulty lambda sensor, which can disrupt the air/fuel mixture, causing poor combustion and increased emissions. After a workshop diagnosis, the lambda sensor was identified as the problem, replaced, and the vehicle's performance returned to normal.

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4 comment(s)

Whoa, that's a bummer on a newer Rifter. Exhaust issues can be tricky. First thought, have you checked your DEF fluid level? Low DEF can trigger similar symptoms even in a gasoline engine due to shared sensors. Also, any chance you've noticed anything unusual with the EGR valve recently?

DEF fluid is good, I checked that right away. EGR valve – not specifically, no. What would I be looking for there? Could a bad lambda sensor cause all these issues at once?

Okay, good on the DEF fluid check. As for the EGR, rough idling or hesitation could point to a problem. But yeah, a faulty lambda sensor could definitely cause all those symptoms. It messes with the air/fuel mixture, leading to poor combustion, increased emissions, and a rough running engine. If the sensor is gone, the engine light is expected to come on. Given the exhaust smell and leak, I'd say get it to a workshop.

Thanks for the advice. It was indeed the lambda sensor. Workshop diagnosed it quickly. New sensor fitted and all is well. Repair cost 375€.

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PEUGEOT

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RIFTER