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amelie_friedrich2

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)

jasmin_ice1

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.

amelie_friedrich2 (Author)

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?

jasmin_ice1

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.

amelie_friedrich2 (Author)

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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