Chevrolet Repair: 2002 Tahoe code P0179/ fuel composition sensor, gm parts, frame rail


Question
QUESTION: Just replaced the fuel pump module and fuel filter in my 2002 Tahoe. There is still an engine code of P0179. Guy at the parts store said it was the fuel composition sensor but they don't carry it. Where is it located on the Tahoe is that something I can do myself?

ANSWER: HI BRYAN, FLEX FUEL SEN ,GM PART#12570260 GM PARTS DIRECT.COM $360 FROM THE DEALER $600.
THE PART IS LOCATED PASS SIDE OF FRAME RAIL BEHIND THE RIGHT FRONT WHEEL. HAS 2 FUEL LINES TO IT AND WIRE CONNECTOR... IF YOU REPLACED THE FUEL PUMP YOU CAN DO THIS..HOPE THIS HELPS, LET ME KNOW IF YOU NEED MORE INFO TOM...

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QUESTION: Thank you for the information.
The new fuel pump turned out to be bad so I replaced it again a few days later. Tahoe ran great for about 2 weeks then my wife said it wouldn't start again. Went to check into it the next day and it started right up and has been running fine.
Still need to replace the sensor to take care of the P0179 code, could that cause the intermittent starting problem?
Also, what do you know about flex fuel sensor replicators? They don't sell E85 fuel anywhere near where we are so is that a viable option or would it do more harm than good?
Thank you in advance!!

Answer
HI BRYAN,THIS FUEL COM SENSOR WILL NOT CAUSE A NO START PROBLEM..IT SENDS ALCOHOL AND FUEL TEMP READINGS BACK TO THE PCM.. I NEVER FOUND ONE TO CAUSE A NO START. I DO NOT KNOW ABOUT FLEX FUEL SENSOR REPLICATORS ?? COULD YOU RATE THIS ANSWER WHEN YOU LEAVE THIS SITE. THANK YOU. I HOPE THIS HELPS YOU, TOM..