Here are some of the most common P0172 causes. Dirty/broken mass air flow (MAF) sensor Vacuum leak Fuel delivery or pressure malfunction (High fuel pressure, bad fuel injector) Contaminated/ defective oxygen sensor Bad coolant temperature sensor
Hard to start Please Help!
I have a 2013 Tahoe that is throwing codes of P0172, 175 and check engine light. It has been tuned up, new throttle body, canister replaced, Map sensor O2 sensor, module by the gas tank programmed and changed and over a thousand dollars later, still the same problem! I am begging for help! Thank you.
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Before new injectors put a quart of Lucas fuel injection cleaner on a full tank and run it.You should note that I have found that some salvage yards DO disassemble engines for parts. One quoted me about 80 bux for 8 injectors for my 2004 tahoe. I was going to but them, test them, and put them in and then send my originals off for cleaning. the problem I find with messing with injectors as I recall was the price of the DAYAM o-rings associated with them...
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