HAVE A 1996 YUKON THE SERVICE ENGINE LIGHT WANT GO OUT PLUS THE ABS LIGHT WANT GO THEY WANT PASS IT ON INSPECTION WHAT DO I NEED TO FIX THEM , THE ABS MY BRAKE RESAVORE IS LEAKING CAN THAT BE THE PROBLUM THANK YOU
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Can be multi reasons search the codes and will have multi sites that give reasons and solutions for the problem --some reasons - dirty air flow sensor -failed or failing O2 sensor-injectors- fuel regulator- vacuum leak- coolant system/ sensor - needs tune up ect.
Code 300 is for a random miss. 172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two. Code 143 is for a rich mixture for sensor number 3. All of the codes could be connected to a leaking injector or other fuel problem. Very seldom are all of the O2 sensors faulty at the same time.
Changed the air filter lately? Possibly defective O2 sensors, but I doubt it. If air filter and intake are clear, I'd check barometric pressure sensor and mass air flow sensors. Get a Haynes or Chilton's for $25 at Pep Boys for instructions on testing these componenets
those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .
CODE PO175 FUEL TRIM SYSTEM RICH BANK 2 CONDITIONS THESE ARE YOUR POSSIBLE CAUSES. YOUR EVAP CANISTER FUEL SATURATED.YOU COULD HAVE A BAD ECT IAT MAF SENSOR.YOU COULD HAVE RUPTURE FUEL PRESSURE REGULATOR.ALSO A LEAKING FUEL INJECTOR.
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