When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I am currently rebuilding my exhaust, see pictures below. The car is a 95, regular LT1 with 3 O2 sensors. I will have all 8 pipes merging in only one exit(collector - Designed this crazy different thing, whatever...), and that is where I will put the O2 sensor/sensors. All 3 sensors are equal, same part number and my question is:
Because it is the same part number and the same installation area, would any of you know if I would be able to use only one O2 sensor, and use the signal of this one sensor to feed the three ECU connectors? Sorry if this sounds dumb for some of you, i have already bought the sensors and extensions, it would only be fast and easier to use just one, I still need to weld the O2 threaded connectors.
You can ignore the rear O2 sensor; it is only used by the hidden OBDII code in the PCM. Errors related to the third O2 sensor will not affect the operation of the car.
I would not recommend using a single O2 sensor to feed both PCM inputs for the front O2 sensors. Yes it can be done, no you should not do it.
If you’re dead set on only using a single O2 sensor for some reason, I would recommend joining Gearhead-EFI and asking if kur4o would be willing to make you a patch that would disable processing for the second O2 sensor and roll it all into the first. That would be the only “correct” way to use only a single sensor.
I am fine with 2 sensors, no issues. But if I can delete the third that is a win for me. I will end up with a spare sensor, but save some money on extenders.
..... Interesting little octopus you built there ! I'm just trying to imagine the scenario should you need to drop the exhaust to change the clutch or something .....
That is a good way to call it, octopus! I would need to drop it, but I would need to drop the OEM as well so I am not worried about it. I will do that soon as well, the clutch is 20+ years old, ~70k miles now, I want a better clutch.
OEM ECU - O2 Sensor Signal
