Reappearing P0400 Code...

typukatch

Member
:
2000 Mazda 626 ES V6
Hi!

Recently had a P0400 code and then cleaned out the valve in the throttle bottle, which was dirty.

The code went away but came on again a few weeks later after I adjusted the Idle Air Bypass valve.

I'm not sure it could actually be related to the Air Bypass valve.

I suspect it could be the actual EGR valve, now, that I have to clean out.

What do you think?

Thanks!!

Ty
 

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