M35 - Deleting Ego Sensor With Std Ecu

[Commsman]

I'm thinking about leaving my EGO sensor out & bunging up the hole in the dump pipe.

Can anyone confirm if the ECU will put up a CEL if the sensor is left unplugged?

I already have the sensor input to the ECU cut off & replaced with a modified signal from my wideband so there's no issue with closed loop running, just a potential issue if the sensor itself is monitored for actually being 'plugged in'.

I would try it out but my car is in pieces & will need to decide before putting dump pipe back on as to whether to leave it out or not (otherwise exhaust & dump needs to come out again ).

It's the dark green one shown loose in this pic (passenger side of intake plenum, closest to firewall)..

[scotty nm35]

I would assume it is only checking the signal into the ecu, if you unplug it there should be no cel if you have cut the wire and plumbed the wideband's narrow output into it. Hopefully it doesn't monitor the heater current or something silly like that.

You could always fit the wideband bung further down the exhaust like they recommend if you have issues.

[kjb_r33]

It only checks for a varying signal, ie above and below .5 volt. If there is no signal they usually default to .3 volt, this simulates a lean mixture and ECU will richen up mixtures. You have a crosscounting signal simulated so they will run happily on that. I done they same thing with my Tech Edge for years..

[Commsman]

I would assume it is only checking the signal into the ecu, if you unplug it there should be no cel if you have cut the wire and plumbed the wideband's narrow output into it. Hopefully it doesn't monitor the heater current or something silly like that.

You could always fit the wideband bung further down the exhaust like they recommend if you have issues.

It was the heater current monitoring that I was thinking could cause an issue. The wideband sensor has been working fine for ages & sending the narrowband signal to the ECU. It is located beyond the dumpipe but before the cat converter so happy with the location & operation. Standard sensor has been sitting there doing nothing but restrict my gas flow a little.

[Commsman]

It only checks for a varying signal, ie above and below .5 volt. If there is no signal they usually default to .3 volt, this simulates a lean mixture and ECU will richen up mixtures. You have a crosscounting signal simulated so they will run happily on that. I done they same thing with my Tech Edge for years..

But have you pulled the sensor plug out of the loom on your V35? Our (M35) Stageas are vastly different to C34's & R33's. I've had no probs running on the simulated signal either, just unsure if our ECU monitors the actual sensor as being connected.

I suppose I could measure resistance / impedance of the sensor &, if I get a CEL when it's put back together, try a high wattage resistor across the socket to fool the ECU into thinking it's still there. But too much stuffing around.

Will someone just pull the plug & start their car already? (I'd do it for you, you know I would!)

[PN-Mad]

From memory there are a few different CELs related to the sensor. Craig unplugged his, and I only got one error code from it. There may be more as time goes on, I don't know, sometimes the ECU errors are based on not seeing sensor info for a specified amount of time. I think its based on the volts output of the sensor, not a actual resistance though- so by using narrowband from the WB, to the ecu, it should be fine.

That was my experience when I unplugged all of mine.

[Commsman]

Thanks Alex. Craig confirmed an error when his was removed, but forgot to ask if his car had any signal going into the ECU to replace it, ie from a WB?. If not, then maybe I will be OK with it gone.