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exhaust sensor question
Posted: Wed Jun 20, 2007 8:37 am
by 33lop
Hi. What's the difference between the 02 sensor and the temperature sensor (found connected to the catalytic converter)? I just replaced my cat with a resonator and my mechanic is suggesting i replace the latter. Thanks!
Re: exhaust sensor question
Posted: Wed Jun 20, 2007 9:16 am
by Brianmoooore
Only electrical device I've ever seen on an E30 exhaust system is a O2 (lambda) sensor.
What makes you think there's a temp sensor?
Re: exhaust sensor question
Posted: Wed Jun 20, 2007 10:12 am
by 33lop
Re: exhaust sensor question
Posted: Wed Jun 20, 2007 8:20 pm
by Brianmoooore
That is indeed a temp sensor, but since it's only fitted to Japanese spec. E30s, I've never seen one, or am ever likely to!
No idea what it's for.
Re: exhaust sensor question
Posted: Wed Jun 20, 2007 8:23 pm
by Ant
Hmm, an O.E EGT thermocouple, must be there to protect the cat from overtemp, from sitting in all those jams
most modern Audi's run an EGT setup under closed loop, its almost a better method than an 02 sensor, but only almost
Re: exhaust sensor question
Posted: Wed Jun 20, 2007 8:29 pm
by zimmerbimmer1
Correct it is an extra sensor for monitoring the catalyst temperature for japanese spec vehicles.
Re: exhaust sensor question
Posted: Thu Jun 21, 2007 3:15 am
by 33lop
Yup. I'm just wondering if it is really needed since there is an O2 sensor. Damn thing costs too.
Re: exhaust sensor question
Posted: Thu Jun 21, 2007 8:01 am
by Turbo-Brown
Running an EGT and a WBO2 is a great way to see what sort of fuel AND ignition advance you can get away with.
The new Emerald can use the VAG EGT sensors as a trigger to retard ignition timing a bit, add more fuel and/or lower boost if the EGTs start getting out of hand.