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Seat Arosa Oxygen Sensor Issue

I'm having a frustrating issue with my 2002 Seat Arosa, gasoline engine. The check engine light is on, and the diagnostic error memory shows an oxygen sensor heater failure. Symptoms include increased fuel consumption and the illuminated malfunction indicator. My initial thought is a defective cable or plug connection. Thoughts?

4 comment(s)

Sounds like the O2 sensor is acting up. When the heater element fails in the oxygen sensor, the engine control unit (ECU) can't properly monitor vehicle emissions, especially during cold starts. The malfunction indicator illuminates as a result. Have you inspected the wiring harness and connector for damage or corrosion?

Thanks for the quick reply! The wiring harness and connector appear visually intact. Is there a reliable method to electrically test the heater element circuit without specialized tools? Could a standard multimeter be used?

Yes, a multimeter can be used, but proceed with caution. However, considering you've already observed increased fuel consumption, a professional diagnosis might be the most efficient route. The exhaust system is complex, and further issues could arise if the repair isn't done correctly. A workshop should be able to pinpoint the exact problem.

I wanted to close this out. I took my Arosa to a trusted mechanic as suggested. The diagnostic confirmed a faulty heater element circuit because of a corroded connector, as suspected. The cost was about 95€, including the part and labor. Thanks again for the assistance in understanding this!

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