I have a 2004 f350 dually with the 6.0 and i just got a dtc P0402. Courious on what this code is any help would be great

 

P0402 Exhaust Gas Recirculation "A" Flow Excessive Detected G* g D* M* N

try cleaning your egr valve

 

What would cause this and how do i fix it

 

your egr valve needs to be cleaned or replaced sounds like its getting stuck open

sorrey that prints small when I cut and paste stuff

heres one that reads better

P0402 C* Exhaust Gas Recirculation Flow Excessive Detected EGR Valve Position does not match desired, limits based on
engine speed / load.
EGR Valve stuck or sticking - EGR Valve Position Sensor Bias - EP

 

where is it located and what do i do to fix it. Does it need to be done right away

 

It should be done soon....you don't want to blow your head gaskets.

 

Clean it soon.

DTS Articles - EGR Servicing

Info:

DTS Articles - EGR Marbles

 

How does a sticking EGR valve cause a blown HG?

 

Superheats the coolant..... superheated coolant cannot expand under the heads...the 6.0 has torque to yield head bolts. Pressure lifts the heads and the gaskets are compromised.

 

How does it "superheat" the coolant?

Is there something I am missing.....

 

and just what kind of air filter do you have?
been donw the p0402 road more then once

 

Sorry - was confusing the EGR cooler with the engine oil cooler... however when one fails, the other isn't far behind. If the ENGINE oil cooler plugs, then my statement holds. Again I apologize for reading something that wasn't really there.

 

Thanks everyone