melissawagner34
Highlander Oxygen Sensor Heater Error
Summary of the thread
A 2018 Toyota Highlander Hybrid experienced a check engine light due to an oxygen sensor heater error, accompanied by increased fuel consumption. The suspected cause was a faulty connection. After checking the wiring for damage or corrosion, it was confirmed by a mechanic that a bad connection was indeed the issue, which was then repaired, resolving the problem.
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4 comment(s)
melissawagner34 (community.author)
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.
davideagle60
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!
melissawagner34 (community.author)
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!
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TOYOTA
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HIGHLANDER
davideagle60
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?