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karl_zimmermann91

Highlander engine power loss

My 2021 Toyota Highlander with a gasoline engine is giving me fits. It's got 170414 km on the clock. Recently, I've noticed a significant reduction in engine power, and the check engine light is on. I scanned the error memory and it's throwing a code related to the engine control unit. I'm suspecting it could be a defective main relay. Has anyone experienced something similar with their Highlander?

4 comment(s)

hans_tiger7

I had something similar happen on my Toyota as well. I didn't have the gasoline engine but the same problem. Have you tried resetting the system or checking the relay itself?

karl_zimmermann91 (Author)

I tried resetting the system but no luck. How did you end up resolving the problem? Was it indeed the main relay, and if so, how did you confirm that?

hans_tiger7

Yeah, it was the main relay. Given the error and symptoms, I didn't want to risk further damage. Took it to a trusted workshop. They confirmed the relay was faulty and replaced it. Best to get it checked professionally before things get worse.

karl_zimmermann91 (Author)

Thanks for the insight. I took it to the workshop, and you were spot on – the main relay was defective. They replaced it for 120€. Appreciate the help!

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