Highlander Oxygen Sensor Heater Error

Ugh, check engine lights are the worst! I had a similar issue with my old car. Did you try checking the O2 sensor's wiring harness and plug for any obvious damage or corrosion? Sometimes, it's just a loose connection. Maybe try wiggling the wires a bit while the engine is running to see if anything changes?

Good call on the wiring, I'll give that a look. When you say 'wiggling', do you mean literally just giving the wires a little shake? Or is there a more precise way to test the connection? I don't want to accidentally make things worse.

Yeah, just a gentle wiggle to see if the engine stumbles or the light flickers. If you're not comfortable doing that, it's probably best to take it to a workshop. Oxygen sensors can be a pain, and you don't want to mess with the vehicle emissions system too much. Good luck!

Thanks for the advice! I checked the wiring and didn't see anything obvious, so I took it to my local mechanic. Turns out it was a bad connection, just like we suspected. They fixed it for 95€, and the check engine light is gone. Appreciate the help!