I have a 92 ex coupe and i have read and been told that it can be misfunctioning without throwing a cel. I have already ordered one and am going to replace it but wanted to know for sure. I am getting crappy gas mileage after almost anything and everything being tuned up, replaced,cleaned, etc. I have had the car for 5 years and i have never replaced it and the owner before never did any maintenance so i doubt he replaced it. I've read 93 and 92's ecu are very different and 92's may not throw a cel if o2 is bad. Can anyone confirm this?
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should i replace my o2 sensor
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I've never heard that there was a difference between 92 and 93 ECUs. All PT6 ECUs are identical, as far as I know. There may be very slight changes made over the two years, but I wouldn't think anything drastic. If I'm wrong, I'd love to see concrete evidence proving otherwise.
I have experienced a failing o2 sensor that threw no codes at first. Fuel economy was decreasing, plugs were fouling faster, and the engine just didn't seem to be running as well as it once did. All are good signs of a rich condition, which is common when the ECU is reading incorrect air/fuel levels.
Eventually, the o2 sensor started throwing code 43 (which is "fuel supply system", oddly enough) whenever I got up to highway speeds (or operating temperature, now that I think about it... probably that, honestly.) It would run like crap until the CEL came on, then it would run better. That was because the presence of the CEL put the ECU back into open loop mode, meaning it was no longer looking for input from the o2 sensor.
Be sure the o2 sensor you get is the correct one for your specific year and model. The plug and wire length is different. You don't want to cut your harness and splice on the new connector, as spliced wires can change the resistance, causing an incorrect reading. If your sensor doesn't plug right up to your existing harness, return it and get the correct one. Don't attempt to make it work, or you could make the problem worse (and more expensive to fix correctly!)
The sensor should also ONLY be a Denso or NTK. If it's a Bosch, return it immediately. Bosch sensors simply do not work on these cars. Ever. Strange, considering Bosch invented the o2 sensor, and they do technically make one designed to work for the F22A... but they don't. They never work in a CB7, and we've had dozens of members confirm this over the years.
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Originally posted by deevergote View PostI've never heard that there was a difference between 92 and 93 ECUs. All PT6 ECUs are identical, as far as I know. There may be very slight changes made over the two years, but I wouldn't think anything drastic. If I'm wrong, I'd love to see concrete evidence proving otherwise.90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums
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Originally posted by sonikaccord View PostO2 sensors are a "wear" part. Their performance will degrade over time and miles driven. These cars are old and typically have over 200k on the clock. And luckily they only have one O2 sensor. $60 over the spread of 20+ years isn't a bad deal!
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