Lexus LS ECU Fault

My 2001 Lexus LS with a gasoline engine is throwing a code and performance is in the toilet. Getting reduced engine power and a fault logged in the ECU. Suspect the main relay's borked it. Anyone seen this before?

4 comment(s)

Sounds familiar. I had a similar issue with my LS. Have you checked the usual suspects like vacuum leaks or sensor malfunctions? Could be something else triggering the ECU issue.

Sensors all check out, and I've smoke-tested for vacuum leaks - nada. Pretty sure it's the relay feeding the ECU that's causing the voltage drop and throwing it all off. Was your issue definitely ECU-related?

Yeah, it was the ECU itself. After chasing ghosts for a week, the shop confirmed it. Best to get it scanned properly.

Cheers. You were spot on. Replaced the main relay - 120€ all in - and she's purring like a kitten again. ECU's happy, and I'm even happier!

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