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Seat Ibiza oxygen sensor issue

Listen to this! My 2007 Seat Ibiza with a diesel engine is giving me grief. The check engine light is on, and I'm pretty sure it's the oxygen sensor. Error code points to it, and fuel efficiency has decreased. Could a defective cable or plug connection be the culprit, messing with the air-fuel ratio and catalytic converter?

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)

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.

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?

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.

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