exhaust sensor question

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33lop
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Wed Jun 20, 2007 8:37 am

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!
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Brianmoooore
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Wed Jun 20, 2007 9:16 am

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?
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33lop
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Wed Jun 20, 2007 10:12 am

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Brianmoooore
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Wed Jun 20, 2007 8:20 pm

33lop wrote:http://www.realoem.com/bmw/showparts.do ... g=18&fg=05

Check out part no: 11781721507
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.
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Wed Jun 20, 2007 8:23 pm

Hmm, an O.E EGT thermocouple, must be there to protect the cat from overtemp, from sitting in all those jams :mad:

most modern Audi's run an EGT setup under closed loop, its almost a better method than an 02 sensor, but only almost :lol:
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zimmerbimmer1
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Wed Jun 20, 2007 8:29 pm

Correct it is an extra sensor for monitoring the catalyst temperature for japanese spec vehicles.
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33lop
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Thu Jun 21, 2007 3:15 am

Yup. I'm just wondering if it is really needed since there is an O2 sensor. Damn thing costs too.
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Thu Jun 21, 2007 8:01 am

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.
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