Question about 2002 Toyota Camry
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Posted on Jan 02, 2017
If you have a P0401 code from a CEL, the first thing is to check the EGR vacuum modulator. It is a little well usually next to the EGR. Pop the cap off and dust the little sponge inside. Sometimes this gets stuffed up with carbon particles and causes recirculation problems. You should clean the tubes hooked to it while you are there. Reset the code and see if the light comes back.
Replacing the EGR is not a tidy job. It is an expensive part to replace and you will disconnect the three hoses and dismantle it from engine by two nuts. Save it for the later if the previous trick fails to work.
Posted on Jan 19, 2009
Start car with egr disconected. You should hear a sucking noise from said hole. If not you must clear this hole and there is your problem. If it is open then all thayt is left is the egr valve itself. hth
Posted on Nov 15, 2009
Check for air leak into system after MAF.
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
Check for loose or no connected vacuum hose(s).
Take it for a test drive.
Please rate my answer if it's useful to you.
Posted on Dec 19, 2009
po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive
Posted on Feb 11, 2010
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