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View Full Version : ME7.5 rear O2 disable



mislav88
4th February, 2012, 04:14 PM
I have Audi A3 2001 with 1.8L 92kw engine with rear O2 error constantly coming on. I have changed O2 sensor, checked wiring, but the problem is still there, after about 20km MIL goes on.

This is file readed with MPPS v12, my WinOls doesnt recognise any checksum, guess it is because it readed it twice (29F400 as 29F800)? How to correct checksum and write file with MPPS? Should i write 512KB file or double (1MB) file?

I believe that 1819F is CDKAT. If I set it to 0, will rear lambda DTCs be gone?

oldford
4th February, 2012, 10:25 PM
What DTC are you getting? (Which number)

mislav88
4th February, 2012, 10:40 PM
dont remember numbers, but there were two, Bank 1 2nd lambda sensor and Bank 1 2nd lambda heater

pvl
4th February, 2012, 10:44 PM
Your file corrected. Checksum/readout = o.k.

You can flash this file back without any worries.

Cheers,

PvL

mislav88
4th February, 2012, 10:50 PM
thanks, but do you know how to disable O2 sensor?

oldford
5th February, 2012, 09:27 AM
If the heater isn't working then the signal can be bad.
Did you use a genuine sensor or an aftermarket one? The after-market ones frequently have problems with the heater.
Have you checked if a 12 volt supply is present for the heater? Negative side is switched by the ecu?

mislav88
5th February, 2012, 01:51 PM
i used genuine sensor, and the problem appears after about 20km driving, so it should not be heater, sensor is then surely hot enough from exhaust gases. as far as i know heater is used only first few minutes of driving when exhaust system is cold?

kombito-tdi
5th February, 2012, 08:06 PM
You have a problem with catalyst
DECISION IS LIKE 1.8T
use damos
1819F is close

mislav88
5th February, 2012, 08:16 PM
181A3 ? that is already 0 in my file

mislav88
5th February, 2012, 08:57 PM
did a little more resarch and i think this is what i have to zero to disable 2nd O2 sensor:

1819E CDHSH
1819F CDHSHE
181A3 CDKAT
181A4 CDKVS
181A5 CDLASH
181AB CDLSH

can anyone confirm that those addresses are good in my file?