How important is O2 sensor?
#1
I just installed the Apexi cat-back on my '97 and there was no hole for my O2 sensor behind the cat. I have it wired out of the way just above the pipe right now. No check engine light. I was wondering if I even need it. What exactly does it do and does it affect fuel/air mixture or the ECU? Anybody have some tech knowledge on this? Thanks.
#2
Originally posted by fred97gle
I just installed the Apexi cat-back on my '97 and there was no hole for my O2 sensor behind the cat. I have it wired out of the way just above the pipe right now. No check engine light. I was wondering if I even need it. What exactly does it do and does it affect fuel/air mixture or the ECU? Anybody have some tech knowledge on this? Thanks.
I just installed the Apexi cat-back on my '97 and there was no hole for my O2 sensor behind the cat. I have it wired out of the way just above the pipe right now. No check engine light. I was wondering if I even need it. What exactly does it do and does it affect fuel/air mixture or the ECU? Anybody have some tech knowledge on this? Thanks.
#4
Originally posted by Daniel B. Martin
The rear Oxygen Sensor monitors the performance of the main Catalytic Converter. It has no influence on the air/fuel ratio. However, I would have expected the Check Engine Light to go on. Don't be too surprised to see it go on in the next few days.
Originally posted by fred97gle
I just installed the Apexi cat-back on my '97 and there was no hole for my O2 sensor behind the cat. I have it wired out of the way just above the pipe right now. No check engine light. I was wondering if I even need it. What exactly does it do and does it affect fuel/air mixture or the ECU? Anybody have some tech knowledge on this? Thanks.
I just installed the Apexi cat-back on my '97 and there was no hole for my O2 sensor behind the cat. I have it wired out of the way just above the pipe right now. No check engine light. I was wondering if I even need it. What exactly does it do and does it affect fuel/air mixture or the ECU? Anybody have some tech knowledge on this? Thanks.
#5
Yes, but...
Originally posted by Weasel
Is there a way to fool the car into thinking the O2 sensor is there and working? [/I]
Is there a way to fool the car into thinking the O2 sensor is there and working? [/I]
A "savvy" electrical engineer could measure the signal coming from a healthy rear Oxygen Sensor and build a circuit which generates that signal. It is a sinusoidal waveform which varies between a low in the range of 0.0 - 0.3 vdc to a high in the range of 0.6 - 1.0 vdc. I don't know the frequency, but believe it to be low (10 hz or less).
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