Question:

Is the resolution to my problem?

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It seems as if I don't have problems with my fuel pump like I believed. About a week ago my check engine light finally came on which may have led to let me know why I had to crank my car a couple of times before it started. (1999 Chevrolet Cavalier) When I went to the auto place it said that i had a bad o2 sensor. This led me soon to believe that I had a bad coolant sensor like someone stated on here which was the cause of my starting trouble and o2 sensor trouble. what i want to know is that when i get this replaced, will this most likely resolve my starting problem and can it cause my check engine like to go off also?

I AM TALKING ABOUT REPLACINE THE COOLANT SENSOR NOW O2 SENSOR

this is what i was told:

Best Answer - Chosen by Asker

O2 sensor data is not monitored during starting, so no, it does not affect starting. If that's the only code you have, and have a starting problem, then you might have a coolant temp sensor malfunction, telling the computer the coolant temp is like -40 degrees, which causes the injection system to run extremely rich, which in turn will cause on O2 sensor code to set.

On the fuel gauge problem, the diagnoses is fairly simple with a schematic and multimeter. Most likely the problem is the fuel sender, but get it diagnosed properly so you don't waste money guessing

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