Question about 2000 Isuzu Trooper
The service engine light is on and on my code scanner i get codes p0401 and p0300 what do these codes mean ? its a 2000 isuzu trooper 3.5L
P0401 is EGR problem
P0300 is a cylinder 3 misfire.
Replace EGR valve and do a full tune-up.
Posted on Mar 19, 2014
Your SUV is really giving you a hard time, lol. Sorry but I've had those days too.
I would try to check if you have blocked EGR passages. If ok check for restricted MAP sensor vacuum hose/passage or restricted exhaust. I know you replaced the CAT but if the muffler is blocked then there would still be a restriction. Also check the wiring and connection to the MAP sensor.
Posted on Apr 28, 2010
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