rolandstar6
Seat Ibiza oxygen sensor issue
Summary of the thread
A 2007 Seat Ibiza with a diesel engine exhibited a check engine light and decreased fuel efficiency, suspected to be due to an oxygen sensor issue. The problem could have been caused by a defective cable or plug connection affecting the air-fuel ratio and catalytic converter. Initial troubleshooting involved checking and cleaning the wiring and connections, which temporarily resolved the issue. Ultimately, a mechanic confirmed the aged oxygen sensor was the problem, and replacing it restored normal fuel efficiency.
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4 comment(s)
rolandstar6 (community.author)
Thanks for the quick reply! I'll check the wiring and connections. Any specific areas I should focus on when inspecting the cable and plug?
james_scholz5
The connection to the sensor itself can corrode, especially with age and exposure to exhaust system heat. Give that a good look. If cleaning the contacts doesn't fix it, you are probably looking at replacing the sensor. It's best to get it sorted at a workshop to be sure.
rolandstar6 (community.author)
I checked the cable as suggested. It seemed fine, but I cleaned the plug connection with contact cleaner and cleared the error memory. The check engine light stayed off! However, after a couple of days it came back on, so I took it to a trusted mechanic. He confirmed it was the aged oxygen sensor and replaced it for 95€. Fuel efficiency seems back to normal. Thanks for your help!
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SEAT
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IBIZA
james_scholz5
Sounds like a faulty oxygen sensor. I had a similar issue with my Ibiza: check engine light and increased fuel consumption. Before replacing the sensor, have you checked the wiring and connections? Sometimes a loose or corroded connector can cause the same symptoms.