Question about 2001 Toyota Tacoma

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Po401 and po420 (95 toyota previa Van super charged engine)

I had both of these codes so i tested my bank1/sensor1 and found an open in the terminals that should read OHM value(13/16 ohms should be present) p0420 gone but still po401 was still popping up so i checked egr valve, egr module, vsv switch, egr tube for exhaust manifold to egr valve and tube that comes off of egr to module. all ok. i was pulling my hair out cause this fault po401 always returned UNTIL i went to the throttle body and found the R port plugged, so i cleaned and po401,420 are gone, now i got a po171 now. Any suggestions?????????? Thanks

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  • Toyota Master
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Check for air leak into system after MAF.

Check for

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.


Cheers,

Mustgo

Posted on Dec 19, 2009

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6ya6ya
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Posted on Jan 02, 2017

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