Code p0402 after new EGR

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May 12, 2013 | 08:16 PM

HzrInAz

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From: Arizona

Code p0402 after new EGR

I replaced my EGR, as I was told it was bad. It wasn't long before the CEL came on again with the same code. I was also told I had a bad injector. COuld this trigger that code? What else could it be? I also saw that AFE cold air intakes can trigger this? I have had that for many thousands of miles though, and no issue before. Any help is appreciated. Thanks.

2006 F250 6.0L Auto Banks tuner, Banks Exhaust AFE COld Air Intake

May 12, 2013 | 08:30 PM

bismic

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P0402 can be from your aftermarket intake.

May 12, 2013 | 08:53 PM

HzrInAz

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From: Arizona

Can it randomly appear like that after 50,000 miles or so with no code? Thanks

May 12, 2013 | 08:57 PM

bismic

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Don't know - maybe a Tech can/will jump in.

edit -
you could try cleaning your MAF sensor.

May 12, 2013 | 09:24 PM

cheezit

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From: N. Fort Worth, tx

yes, normally do from a bad or dirty maf. i also had one installed facing wrong way cause it

May 12, 2013 | 09:28 PM

HzrInAz

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Ah, so a bad maf can cause that too? How do you intall a maf the wrong direction?

May 13, 2013 | 05:29 PM

cheezit

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From: N. Fort Worth, tx

Quote:

Originally Posted by HzrInAz

Ah, so a bad maf can cause that too? How do you intall a maf the wrong direction?

being a dumba$$... no really there is an arrow for direction of ari flow as the sample chamber in the maf has to be pointing towards incomming air.
been there seen that trick before. took me a little while to find it

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May 14, 2013 | 03:52 PM

Edogsf350

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From: Jerome Idaho

Sorry to hi jack! Sohouldnt the arrow be pointing with the air flow?

May 14, 2013 | 04:00 PM

#10

HzrInAz

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From: Arizona

There is an arrow pointing the direction yes.

So, I replaced the MAP sensor yesterday,because my brother broke it plugging my tuner back in. Also cleaned the MAF sensor. Truck is back to running awesome again with great throttle response....but, now I get a P0237 code...low turbo boost sensor circuit, which mentions the MAP also. This is a new one. My P0402 is gone though. Anyone?