Petes ES300h Posted December 20, 2022 Share Posted December 20, 2022 My 2015 ES300h is a great car, but i experience something very odd at high altitudes. This has happened twice - when driving at altitudes above 11000 feet, probably going downhill, my engine rpms suddenly start to rise without my car going any faster. When it passed 4000 rpm, i pulled over and stopped to get the engine back to normal. I would then begin driving and within about 20 seconds, the engine would do the same. This happened about 6 months apart. I've had it checked by two dealers and it shows nothing was wrong. Has anyone else had this happen? Any ideas what's causing it and how to make it stop? Quote Link to comment Share on other sites More sharing options...
Petes ES300h Posted January 27, 2023 Author Share Posted January 27, 2023 Has anyone else experienced this? No replies yet - help! I don't want to take my car to Colorado again! Quote Link to comment Share on other sites More sharing options...
Lexus Owners Club Posted January 27, 2023 Share Posted January 27, 2023 Wonder if the altitude setting within the ECU is coping with the slightly lower oxygen content? This would be measured by the Air Mass Meter or MAP Sensor and non-adjustable unless you have a remap to compensate for this Have had similar issue with motorbikes in the past when riding in Austrian Alps Quote Link to comment Share on other sites More sharing options...
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