Mark X Oxygen Sensor Issue

Hey, got a persistent check engine light on my 2010 Toyota Mark X (gasoline engine). Getting an oxygen sensor heater failure error. Mileage is at 134294 km. Already noticed higher fuel consumption. Suspect it's a dodgy connection, but haven't had time to dig deeper.

4 comment(s)

I had a similar issue with my Mark X. Faulty sensor can really mess with your vehicle emissions. Did you check the sensor plug? That's where my malfunction indicator led me.

Yeah, I glanced at the plug, but didn't do a thorough check. Was your issue definitely the plug, or something else? Any tips on where to look exactly?

For me it was the plug, but the sensor itself was also faulty. Honestly, for peace of mind and proper diagnosis, I'd get it checked by a workshop. Cost me about 95€ to get sorted.

Cheers for the advice! I'll give the plug another look, but probably best to get it properly diagnosed. Appreciate the help!

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