Wideband Gauge

**wagongang** · 08-25-2016 08:56 PM

I have a 2000 A4 Avant 1.8t that has a catless testpipe installed. I'm thinking that since there is no cat both O2 sensors should be reading about the same. Would I be able to wire one O2 sensors to both banks and not hurt performance? The reason why I would do this is to install a wideband sensor in the other bung. Thoughts?

**xthealienatorx** · 08-25-2016 09:03 PM

Just get rid of the second sensor.

Sent from my SM-G920T using Tapatalk

**wagongang** · 08-25-2016 09:48 PM

It won't hurt anything if the car is not getting that signal?

Sent from my SM-G930V using Tapatalk

**SynapticA4TQM** · 08-26-2016 05:20 AM

Leave it connected and zip tie it to the fire wall or somewhere else so that the tip isn't touching anything. I've got mine on top of the shock tower mount in the engine bay

Sent from my iPhone using Tapatalk

**bikerbob951** · 08-26-2016 06:02 AM

Why not just get a third bung welded in place, and do it correctly? Probably wouldn't cost more than $30.

**SynapticA4TQM** · 08-26-2016 06:30 AM

Originally Posted by bikerbob951

Why not just get a third bung welded in place, and do it correctly? Probably wouldn't cost more than $30.

There's that too... For me, I didn't want to go through the the trouble of reaching the downpipe bolts, and it's my daily driver and I haven't been able to negotiate the down time...

Sent from my iPhone using Tapatalk

**wagongang** · 08-26-2016 06:40 AM

Originally Posted by bikerbob951

Why not just get a third bung welded in place, and do it correctly? Probably wouldn't cost more than $30.

I'm learning tig welding soon so I'll probably weld one in myself. I have my exaust apart right now to replace my driveshaft so I figured I would wire up the gauge while the car is out of action.

Sent from my SM-G930V using Tapatalk

**wagongang** · 08-26-2016 06:40 AM

Originally Posted by SynapticA4TQM

Leave it connected and zip tie it to the fire wall or somewhere else so that the tip isn't touching anything. I've got mine on top of the shock tower mount in the engine bay

Sent from my iPhone using Tapatalk

Does is matter which one I remove?

Sent from my SM-G930V using Tapatalk

**SynapticA4TQM** · 08-26-2016 06:44 AM

Originally Posted by wagongang

Does is matter which one I remove?

Sent from my SM-G930V using Tapatalk

Don't remove your front O2!

Sent from my iPhone using Tapatalk

**wagongang** · 08-26-2016 06:51 AM

Originally Posted by SynapticA4TQM

Don't remove your front O2!

Sent from my iPhone using Tapatalk

Thanks for the help!

Sent from my SM-G930V using Tapatalk

**redline380** · 08-26-2016 07:28 AM

First off, your engine only has one bank. It is a I4. Second, yes, you cannot delete the primary o2 sensor, that one is important.

Now, an option for you is to run the wideband o2 sensor only and use the simulated narrowband signal for the ECU. This would mean you only have to run one sensor period, and you can have your gauge and feed your ecu signal too. However, I would recommend against this since OEM is usually best.

**SynapticA4TQM** · 08-26-2016 07:39 AM

^^^ that's the logic I followed... Better to leave the front/primary O2, and replaced my rear o2 with the wideband. That and the idea of trying to splice wires into the harness didn't sound like too much fun...

Sent from my iPhone using Tapatalk

**redline380** · 08-26-2016 07:49 AM

Originally Posted by SynapticA4TQM

^^^ that's the logic I followed... Better to leave the front/primary O2, and replaced my rear o2 with the wideband. That and the idea of trying to splice wires into the harness didn't sound like too much fun...

Sent from my iPhone using Tapatalk

Splicing isn't a big deal since you would just chop up the sensor harness not the engine harness.