My tahoe 2002 has a flex fuel sensor indicating

fuel filter is clogged , it could also be the fuel pressure regulator but start with the filter , its the most likely culprit and you really cannot diagnose the regulator without changing the filter first then testing the regulator

2002 Chevy Tahoe + P0171/P0174 - Chevrolet Forum - Chevy ...

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Jul 8, 2007 - I have cleaned the MAF sensor, changed the fuel filter, ... I also have a 2002 Tahoe that is posting the p171 and P174 codes and .... I have a 2000 ChevyTahoe with a 5.3L V8. ... That seems normal for the light to go off after running, the IAC motor should have its own fault code, so it may not be that, but not ...Missing: flex

SilveradoSierra.com • P 171, P 174 error code : Vortec 5300 ...

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Sounds like the fuel composition sensor is bad causing it to run rich .. Is your Tahoe a flex fuel ?

On Board Diagnostic Codes-- DO NOT tell you
what is wrong or what to replace

None of what you replaced was necessary for a PO178

Have it scanned and diagnosed professionally

I prefer bosch plugs :

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pointaengineer.com check out and your welcomed:-)

I believe the speedometer is ran by the computer and is pulled off the vechicle speed sensor, if thee is a cable it would be on the side of the transmisson drivers side.

replace mass air flow sensor.

fuel filter? blockage?

dear sir, should be on trans crossmember on drivers side look at fuel lines the sensor has fuel that goes thue it and one wire connector with four wires in it .....good luck