Originally Posted by
GVK.
The 3 wires are for the EGR level/height sensor, they don't operate it, it's operated by the vacuum pipe, there's a solenoid on the bulkhead just behind the EGR valve that controls it.
But still if its not picking up any feedback fromt he EGR shouldnt it put the engine light on? Also why would someone cut them instead of blanking it off?
Would blocking the vacuum pipe do the same as fitting a blanking plate or would it be open all the time if I blocked the vacuum line?