Noticed the other day the 3 wires going to the EGR have been cut on my Focus TDDi, I would guess that should throw up a code and put the engine light on straight away? If so is it possible its been 'mapped out'. It hasnt had any other work done as its slow and the cat is still on and doesnt look like its been touched.

Car runs fine!

It doesnt have a blanking plate on it, is it worth putting one on? Im guessing the EGR is constantly closed if its not plugged in?

Thank you!