janamiller9
Peugeot 406 exhaust leak and sensor issue
Summary of the thread
A 2003 Peugeot 406 diesel was experiencing a check engine light, reduced engine power, and increased fuel consumption. The issue was suspected to be related to a faulty exhaust temperature sensor, indicated by unusual temperature readings. It was suggested that an exhaust leak could be affecting the sensor's performance. Upon professional inspection, a leak in the exhaust system was found and repaired, and the sensor was replaced, resolving the problem.
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4 comment(s)
janamiller9 (community.author)
Interesting! Where exactly should I be looking for these leaks? Is it something I can check myself, or should I just take it to a shop?
melinaschmidt1
Honestly, unless you're really comfortable with cars, I'd say get it checked by a professional. In my case, it was a small crack in the exhaust manifold. It was causing all sorts of problems with the engine management. Best to get it sorted properly. If the sensor is the issue, sensor replacement should fix it.
janamiller9 (community.author)
Thanks a lot for the advice! Took it to the shop, turns out there was a leak in the exhaust system that was messing with the exhaust temperature sensor. They fixed the leak and replaced the sensor. Cost me 265€, but at least the engine runs smoothly again!
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PEUGEOT
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406
melinaschmidt1
Sounds familiar! I had similar symptoms on my 406. The diagnostic tool showed some issues with the emission control system. Have you checked for any exhaust leaks? That can mess with the sensor readings.