Primey

Last night I fitted my decat exhaust, took the car for a quick run and the ABS light came on.

I'm not 100% sure why, there is a squeaking from the rear N/S brake which I'll be inspecting soon. Has anyone had anything like this before?

I am temporarily running the resistor fix in the exhaust gas temp sensor, and the lambda sensor spacer until I get a remap. But being as the car is off the road I think it'll be fine until the remap, just having the occasional run.

Any help or advice would be appreciated.