QuestionQUESTION: I have codes P0113 P0172 P0440 Car will not pass emissions. What could be the problem by reading these codes? Thank You
ANSWER: what year
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QUESTION: I'm sorry, it's a 2002 bravada with a 4.2 The codes are PO113 PO172 PO440 I know what the codes are but what would cause these? How can I fix this?
AnswerHi
P0113 I would make sure the IAT is plugged in.
If not make sure it has 5v ref signal.
p0172 could be MANY things. Anything that can cause rich condition. too much fuel or not enough air. Stuck injectors, clogged air filter, fresh air passage. Faulty fuel pressure regulatir.
P0440, fuel cap. Fuel tank neck cracked. Stuck vent valve. purge solonoid stuck on. Any leak in EVAP system can cause a 440.
I would THOURGHLY diagnose each system properly and should lead you to the failure of each code.
Pawl
