[s-cars] O2 Sensor Reading from VAG-COM

Sean Douglas quattro20v at telus.net
Sun Jul 18 16:10:33 EDT 2004

Brian, not sure about VAG-COM, but the VAG 1552 does allow O2 readings.
You use channel 08, measuring value blocks, display group 01, item 3.

Bentley says it should be between 0.96 and 1.04, "greater than 1.04
indicates a lean condition and to compensate enriches the control

I checked mine while the car was stationary and it was within spec, but
have yet to try it under load.

A wide band O2 sensor will give you more accurate readings and I believe
someone posted a link (Hap?) that uses a Bosch sensor that plugs in the
OE port and still give the correct readings to the ECU while outputing
A/F ratios.

Sean Douglas
1997 Audi S6//RS2-spec
1990 Audi 90 quattro 20v

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Brian Powell
> Sent: Sunday, July 18, 2004 6:48 AM
> To: s-car-list at audifans.com
> Subject: [s-cars] O2 Sensor Reading from VAG-COM
> Does anyone know if there is a way to get the O2 sensor (lambda) 
> reading from VAG-COM?  I found a number of channels with 
> Lambda ratios 
> and had four ratios displayed at the same time.  They were all 
> different and made little sense.
> I'm curious if I can get the voltage reading ( 0 to 1 volt ) 
> that comes 
> from the normal O2 sensor.  I just want to make sure that 
> with the new 
> RS2 goodies, it isn't getting too lean (which is all a normal 
> O2 sensor 
> can really give you: the extremes).
> I have the chip to build an O2 sensor (just need a few LEDs), but, it 
> would be easier if I could use the VAG-COM tool I already have.
> Thanks,
> Brian
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