XC70 Check Engine Light Fuel Consumption

Hey there! I had a similar problem with my XC70, although it was a while back. That check engine light is a pain, isn't it? If the diagnostic tool is pointing to the oxygen sensor – which measures the amount of oxygen in the exhaust to help the car's computer control how much fuel to use – then yeah, a bad connection could definitely be the culprit. Have you tried cleaning the sensor itself?

Thanks for the quick reply! I haven't tried cleaning the sensor itself yet. To be honest, I'm a bit of a novice when it comes to that. Is it easy enough to get to, and is there a specific type of cleaner I should use? Also, when you had the issue, were your symptoms exactly the same? Higher fuel consumption and the check engine light?

Yeah, those were my exact symptoms! Cleaning it might help, but honestly, it could be a temporary fix at best. Given the error code and your mileage, it might just be aged. While you could try cleaning it, I'd suggest getting it checked out by a workshop to confirm. They can properly diagnose the sensor and the wiring.

Okay, that's great advice. I'll take it to the workshop and have them take a look. It's probably best not to mess with it too much myself and risk making things worse. It turns out it was just a defective cable causing a bad connection. They replaced the cable, and the check engine light is gone, and my fuel consumption is back to normal. Cost me 95€, which isn't too bad. Thanks again for your help!