horstlorenz1
S40 exhaust temperature sensor issue
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.
Did this summary help you solve your problem?
4 comment(s)
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€.
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
VOLVO
community_crosslink_rmh_model
S40
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.