A little help with year and engine size could go a long way.... If there are no drivability concerns (rough idle or such), it is most likely the DPFE sensor - providing yours is equipped with one...... but then that depends on year and engine size.
-- Jim Warman snipped-for-privacy@telusplanet.net
My Service Engine Soon Light Came On and the Computer Chip States That P0402
> Exhaust Gas Recirculation Flow Excessive Detected EGR System. Would anybody be
> able to tell me what causes this code to happen???
>
> Thanks