haraldblitz32
Seat Toledo oxygen sensor heater failure
Summary of the thread
A 2017 Seat Toledo diesel is experiencing a check engine light due to an oxygen sensor heater failure, leading to increased fuel consumption. The issue may be caused by a defective cable or plug connection. A suggested solution is to inspect the wiring and plug connection for looseness or corrosion, which was confirmed to be the problem. After addressing the faulty connection, the malfunction indicator was resolved.
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4 comment(s)
haraldblitz32 (community.author)
Wiring and plug connection, you say? Is there a specific area I should be looking at, or is it just a general visual inspection?
magdalena_beck17
It's worth checking the connection first. Give the plug a wiggle, see if it's loose or corroded. If it looks okay, I'd just take it to a workshop. Could be a faulty sensor itself, but a dodgy connection is more common. Is it worth getting your hands dirty?
haraldblitz32 (community.author)
Thanks so much for the help! It turned out to be a faulty connection, just like you suspected. 95€ later, and the malfunction indicator is finally off!
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SEAT
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TOLEDO
magdalena_beck17
Sounds like the dreaded oxygen sensor heater failure! I had a similar issue with my old Renault Megane. The check engine light kept popping up, and the fuel consumption went through the roof. Have you checked the wiring and the plug connection to the sensor? That was the culprit in my case.