Lambda Sensor..
 

I think my Lambda Sensor is causing the CEL to come on after about 10-15 minutes of running then stay on until the engine is switched off and cools down.

I've got a '96 2.0 Sport, does anyone have a quality pre-enjoyed sensor for sale?

I don't want to have to give the local Motor Factor £50 for one to find it's not the source of the problem.