Disconnecting the battery or switching off all power and leaving it and putting it back on again will fix nothing that’s an old school fix for early ECU’s with EPROMs. For over 20 years cars ECU’s have used E2PROM’s (difference is they now use Electronically ERASABLE Programable Read Only Memories) tats why you use your code reader to read and then delete the codes.
If it were mine I would read all codes make a note then delete them then leave your code reader on and go to monitor values go for a drive and see if it collects anything strange but I strongly suspect it will read nothing and the light will stay off and then randomly one day it comes back on and you just go through the process of read notes and delete again as the car will be running perfectly.
We had an issue at Volvo Cars with one of the engine types where on start up depending where the crankshaft stopped it was possible for it to kick back a few degrees before the signal was received and install a code that the flywheel sensor signal was missing of course it wasn’t, the car runs perfectly by referencing the camshaft signal took us a long time to find that one!
Good luck but I suspect as Graham said it’s a brain fart in the ECU
Br
Colin
Hi Colin,
It seems to remember a Green Plus 8, isn't it ?
BR
