2005 Ford F-150 Check Engine Light Staying on - Code P0402

Question

2005 Ford F-150 check engine light is staying on after a gas fill and hasn't gone back off after several fill ups and I'm making sure the gas cap in on well. AutoZone hooked it up to their machine and this is what the print out says :

P0402 - ERG system fault (exhaust gas recirculation) The ECM has detected too much flow on the EGR system. Probable cause - EGR valve stuck open - Failed EGR pressure sensor - Failed EGR valve - Failed EGR pressure sensor where applicable - Failed EGR position sensor where applicable.

What does this mean and what should I do?

Answer 1

you can start by cleaning the EGR and its piping since they do get clogged with carbon built-up over time.