Sorry for the thread hijack.
What you've said has me worried irn-bru :0
I've had mine remapped with the art pipes and my engine light always comes back on so have had it left on for like 1 year and a half now and do the pedal dance just for m.o.t. Even with it being mapped is my car running wrong air fuel mix and that? I thought since its mapped it should be fine and the light is due to faulty sensors.
My eml came on too even after it was mapped but I just fitted spacers and it's sorted now, but to put my mind a rest I double checked with Chris @ Dynatune just to make sure all was well. Might be worth you double checking with your mapper, but I'm assuming it was Chris who done it for you too.
Yeah was with Chris. Haven't had the chance to pop round recently but will need too soon.