There is 'a code' relating to 'something' that the
ECU is throwing the CEL on for.
But I learn something new every day. GD > GC.
Timboon, get the code read. And we'll take it from there. And if you dont want to fork out money for the new sensor 'on a whim', see if you can source a second hander, to trial, and see if it is the problem.
Brent.