barbarastar1
Lexus LFA ECU Error Codes
Summary of the thread
A 2011 Lexus LFA was experiencing reduced engine power and storing error codes, leading to suspicions of a defective engine control unit (ECU). The issue was suggested to be potentially caused by a faulty main relay, which is located in the engine bay fuse box. After replacing the main relay and clearing the error codes, the vehicle's performance returned to normal.
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4 comment(s)
barbarastar1 (community.author)
Cranking is fine, and all other systems seem normal. Where is that relay located? Is there any chance it is a grounding issue somewhere?
manuel_koehler1
The relay is usually in the engine bay fuse box. A bad relay can definitely cause ECU issues. Failing that, have the unit checked at a workshop. See if you can get away with just a system reset. Good luck.
barbarastar1 (community.author)
Thanks. Checked the main relay as suggested - appears that was the source. Replaced it, cleared the codes, and power is back. Total outlay 120€. Appreciate the help.
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LEXUS
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LFA
manuel_koehler1
Could be a few things, but first check your main relay. Is the car cranking okay? Any issues with other electrical systems?