O2 Sensor Effect On MPG?

[chiaxi2002]

If my O2 Sensor is bad how much will it effect my MPG and performance?

[JoshM]

If the o2 sensor is bad the car will compensate for the too rich/too lean problem and lead to bad gas mileage and poor performance


As for how much of each, I dunno.

[Brian0288]

I know i suffered alot!!!! i remember when my o2 was going bad 10 dlls wouldnt last me 2 days...... i thought it was the fuel filter but then for some reason i had an itch in my head thinking it was the o2 sensor..... so i replaced it anyways cuz who knows how long the previous owner replaced it.... and wola!!!! lolnow my 10 dlls lasts me for more than 3 days lol

[chiaxi2002]

Do you need a special tool to chage the O2 Sensor? I have a 1990 Accord EX...Let me know guys...

[Sarthos]

you just need a wrench that can go over the 02 filter. Or a socket if you wanna cut the wires off the old one. Might be useful because they can be hard to remove. We tried to take mine out and it cross-threaded so it's not coming out .

[Losiracer2]

or just an adjustable crescent wrench.

[deevergote]

You can borrow the proper socket from any major autoparts store. That is the correct way to do it.

And yes, the o2 sensor is what tells the ECU how much fuel to send. When the reading is off, the ECU dumps a "safe" amount of fuel... which is alway far more than you really need. Anytime you see someone whining about getting 12mpg... that's because their o2 sensor is shot.

When you replace it, replace it with a genuine Honda sensor. The cheap aftermarket sensors do not work correctly. The Honda sensor is much more expensive, but IT WORKS. Paying anything at all for a sensor that won't work correctly is idiotic.

[Sarthos]

What's the proper socket for an 02 sensor, is it just a regular socket or is it a specialty socket that can somehow get over or around the wires?

[deevergote]

It's a socket with a notch cut in it to clear the wires.

[Sarthos]

I wish I would've known about that when we did my exhaust, then I wouldn't have had to cut and tape the wires back together to use a regular socket.

[chiaxi2002]

One more thing, the CB7 only has 1 O2 Sensor right?

[zonda]

yes our cars only have one

[accordict]

If my O2 Sensor is bad how much will it effect my MPG and performance?

I just replaced mine, just filled up first tank b4 I got home and I went from 20 mpg to 30.9, On a h22 swap I/H/E and chipped ecu.... damn it for not getting 31