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Emissions light after cat delete
Posted: Thu Aug 29, 2019 3:50 am
by moondog01
Need help with orange emissions light on dash which has come on after cutting out rear cats and exhaust work. Local garage (not Audi) deleted light but it came on again. They suggested soldering a resistor between appropriate wires on O2 sensors to fool computer into thinking emissions OK. Anyone tried this? Or any other suggestions welcome.
The Flying Kiwi.
Re: Emissions light after cat delete
Posted: Thu Aug 29, 2019 9:37 am
by Dinosroume
moondog01 wrote: ↑Thu Aug 29, 2019 3:50 am
Need help with orange emissions light on dash which has come on after cutting out rear cats and exhaust work. Local garage (not Audi) deleted light but it came on again. They suggested soldering a resistor between appropriate wires on O2 sensors to fool computer into thinking emissions OK. Anyone tried this? Or any other suggestions welcome.
The Flying Kiwi.
Just get a stage 2 remap to fool the rear O2 sensors.
I'm planning go decat in my rs4 with an H or X pipe and stock rear backboxes and REVO stage 2.
You need to delete the rear lambdas or a software that avoids rear lambdas (stage 2 remap)
Dinos
Re: Emissions light after cat delete
Posted: Thu Aug 29, 2019 10:57 am
by Rick_RS4
Get 2 lambda bosses that extend the lambda away from the flow. I have the 90 degree ones
Re: Emissions light after cat delete
Posted: Thu Aug 29, 2019 1:34 pm
by Daytona
+1 for spacers, I had mine on for ages before I had a remap and the light didn’t come on once.
I’ve still got them if you’re interested?
Re: Emissions light after cat delete
Posted: Sat Aug 31, 2019 7:26 am
by moondog01
Thanks for the help guys. I think I'm going to go with the remap option. Spoke to the tuner, who said they expand the range in the computer to effectively delete the fault and the sensor will then read correct to the cpu. A map will give me the option to improve performance as well and I'll get it on the dyno for the first time.
Re: Emissions light after cat delete
Posted: Sat Aug 31, 2019 5:37 pm
by James1984
How long did the light take to show up?
Re: Emissions light after cat delete
Posted: Sat Aug 31, 2019 9:21 pm
by moondog01
James1984 wrote: ↑Sat Aug 31, 2019 5:37 pm
How long did the light take to show up?
About 50 miles of travel after exhaust work from memory.
Re: Emissions light after cat delete
Posted: Sun Sep 01, 2019 8:41 am
by James1984
moondog01 wrote: ↑Sat Aug 31, 2019 9:21 pm
James1984 wrote: ↑Sat Aug 31, 2019 5:37 pm
How long did the light take to show up?
About 50 miles of travel after exhaust work from memory.
Thanks, I have a full decat and mines still off, only been running for a few days