How do you change a oxygen sensor in a 99 chevy tahoe?

[wendylee431]

I have a 99 chevy Tahoe and the sensors are bad I need to change them asap My daughter is coming home tomarrow and I am going to need the truck to pick her up 2 1/2 hours from home please help...

[j001solis001]

depends on what sensor you wanna replace and also just a note only one sensor may go bad and not more than that. If you have say sensor 1 bank 1 and sensor 1 bank 2 going lean then I would check for a fuel pump going bad or a vacuum leak some where because they both never go out at the same time. Same thing if both banks for sensor 2 codes you really need to check the circuit first to see that there is no problems with it. It just may be an intermittant problem. Clear the light and drive around and see if light comes back on with same codes again. If it does have it diagnose and do not assume that just because you have an O2 code that its a bad O2 sensor. If you have a code for all 4 sensors that never happens so you really need to have diagnose for possible faulty ECM. You replace all 4 sensor and 100% sure the light will return for same thing.