i have a 02 reg vectra that keeps going in 2 limp mode and i get the code 0400 i have tried a egr valve and cleaned the inlet manifold ov all the gung and still the light cums on do u have any ideas cheers geoff
Is this a diesel?
Make sure the engine oil level is correct.
Check all vacuum hoses, connectors and elbows etc. for splits or leaks.
Do you have a vacuum gauge? Plumb it in next to the pump and check what it is drawing.
