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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.

Summary of the thread

A 2010 Toyota Mark X is experiencing a persistent check engine light due to an oxygen sensor heater failure, leading to higher fuel consumption. The issue may stem from a faulty sensor or a dodgy connection, particularly at the sensor plug. While a quick inspection of the plug was done, a thorough check or professional diagnosis is recommended to resolve the problem effectively.

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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 (community.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 (community.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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TOYOTA

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MARKX