Oil cooler diverter valve

[Mike R]

Originally Posted by _Nathan_

???

Heard it all now, wheel speed sensors forgotten how to communicate?

It was very bizarre. A simple reset would not turn the warning off. In the end, the only thing that would was for the ECU to relearn the sensor (or have it reassigned or what-ever you want to call it).

This was when I had allowed the battery to run low on voltage by running a tyre compressor off the cigarette lighter, without the engine running (the car started immediately afterwards and the light came on after a few miles of driving). The sensor was not disconnected at any time, but the ECU could not detect it was present until it was specifically told to "look" for it.