'01 f150 sputtering
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'01 f150 sputtering
it started sputtering at random times a few days ago and the check engine light came on. the two codes are p0401 (blocked egr syatem) and p0402 (egr valve stuck open). it seems to do it most when it's cold but some days itll do it non stop. please let me know if you've had the same problem or know how to fix it thank you!
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Those codes are oppisite each other in testing.
401 is a low flow test failure.
402 is an excessive flow test failure.
I would be first looking at the vacuum regulator for sticking.
It's used for both tests and all operations of the EGR system.
Follow the hose from the EGR back to the vacuum regulator.
Remove it and spray clean inside with throttle body cleaner.
Take the round CAP off the top and clean the filter inside it.
See if this fixes the problem.
Good luck.
401 is a low flow test failure.
402 is an excessive flow test failure.
I would be first looking at the vacuum regulator for sticking.
It's used for both tests and all operations of the EGR system.
Follow the hose from the EGR back to the vacuum regulator.
Remove it and spray clean inside with throttle body cleaner.
Take the round CAP off the top and clean the filter inside it.
See if this fixes the problem.
Good luck.
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