[rtrejo77]

The codes are P401 & P402 on the OBD reading and they say insufficient flow. I already changed the EGR valve. What else can I do? Please help if you can. Its a 96

 

[lcurle]

clean the Mas Air sensor?

 

[FunkyBoss]

Is the car running poorly? Bad gas mileage?

 

[rtrejo77]

Realy?

Would a dirty MAF really make the code come up EGR flow insufficient? Is it just a guess or how sure are you.

 

[FunkyBoss]

You may want to replace the DPFE sensor. Mine went bad on my Windstar and the $50 replacement from Advance Auto Parts fixed it right up :smoke: . Of course it was running horribly, stuttering and what not, getting 10 MPG.

 

[kscoyote]

Would a dirty MAF really make the code come up EGR flow insufficient? Is it just a guess or how sure are you.

I don't know the codes. a MAF shouldn't cause problems with the EGR. If it's EGR flow, then it's a sticky valve.

 

[rtrejo77]

The car runns fine and I just had the EGR valve replaced a day ago because I thought it might be a sticky valve. It used to read both insufficient and exessive flow but now with the new valve it just reads insufficient

 

[kscoyote]

The car runns fine and I just had the EGR valve replaced a day ago because I thought it might be a sticky valve. It used to read both insufficient and exessive flow but now with the new valve it just reads insufficient

did you disconnect the battery?

 

[rtrejo77]

No I erased the codes with an OBD II

 

[kscoyote]

No I erased the codes with an OBD II

Before you go any further, disconnect the battery for a few minutes and reconnect to see if it comes up again.