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horstlorenz1

S40 exhaust temperature sensor issue

My 2002 Volvo S40 with a gasoline engine has a check engine light, reduced power, and higher fuel consumption at 172416 km. My OBD reader says it's the exhaust temperature sensor. I suspect an exhaust leak. Anyone seen this?

Summary of the thread

A 2002 Volvo S40 with a gasoline engine experienced a check engine light, reduced power, and increased fuel consumption, with an OBD reader indicating an exhaust temperature sensor issue. The owner suspected an exhaust leak as a potential cause. After taking the car to a workshop, it was confirmed that a small leak in the exhaust manifold caused the sensor fault. The problem was resolved by replacing the sensor and welding the leak.

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4 comment(s)

leonie_schwarz3

I had something similar with my old Opel Astra. Check engine light, sluggish performance. The mechanic kept talking about the engine management system and emission control. Could be a bad sensor, but definitely check for exhaust leaks first.

horstlorenz1 (community.author)

When your Opel Astra had these issues, did they appear gradually or suddenly? Did the garage mention the specific error codes they got from your Opel's ECU?

leonie_schwarz3

It was pretty gradual at first, then got worse pretty quickly. I didn't write down the codes, sorry. Just take it to a workshop, they'll figure it out faster.

horstlorenz1 (community.author)

I took it to the workshop as suggested. The exhaust temperature sensor was faulty due to a small leak in the exhaust manifold. New sensor and some welding, and all is well. Repair bill was around 265€.

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VOLVO

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S40