Whisper

iTrader: (12)

Ive learned these cars have 4 o2 sensors, but if I think o2s are the reason for horrible gas mileage, shouldnt i only worry about the front 2? Ive already ordered a k&n and will soon be replacing the fuel filter as well.

NoStyle

Front 2 02 sensors monitor and help control fuel mixture. The rear 2 monitor catalytic performace. How "bad" of gas milage do you get?

brightgreenZ

What kind of rear end gear do you have and how many miles do you have also? I have a 98 z with 87,000 miles and a 3.73 rear gear and also have 2 bad sensors but they are by the cats.Also what kind of gas mileage are you getting do you have a A4 or M6?

natronathon

the rear o2's have nothing to do with your fuel mixture, they simply activate an ses code for emissions upon removal or malfunction. The front o2's are the ones responsible for adjustments in the fuel curve. But, they are generally not the cause of bad gas mileage. You might want to clean your maf, that can often help to make your car run more efficiently. buy some electronics SPRAY ON cleaner, dont brush it!

Whisper

iTrader: (12)

Ive got a 99SS with an M6 with almost constant 1-3-5 shifting and not stepping into it all of the time. No mods other than SLP's offered dual dual and suspension.

Whisper

iTrader: (12)

Oops forgot...the car is a high miler at 105,000.

iwantanls1

iTrader: (1)

uh huh.......but how many MPG are you getting right NOW?

Whisper

iTrader: (12)

17mpg with conservative driving. Where is the maf located?

02 Camaro SS

iTrader: (4)

In between the air bellows and the throttle body.
If you pop your hood and track the air intake, it goes airbox->bellows(flexible rubber thing)->mass air flow sensor.