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Author Topic: atw rear o2 removal  (Read 6154 times)
royce5950
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« Reply #15 on: November 16, 2023, 06:18:15 PM »

I've removed my rear oxygen sensor and am getting a P1118 rear o2 sensor heater code. I have a 2000 A4 1.8t with the 4b0906018P ecu

What I've done:
CDKAT -> 0
CDKAT2 -> 0
CDHSH -> 0
CWDLSAHK -> 0
CDLSH -> 0
CWKONLS  -> 1

However, two different XDF files I have seem to have conflicting locations for what these values actually are. I've been using the map labeled 4B0906018P ATW 1.1, but when I open the bin with the other definition file (4B0906018P 352750) the values seem to be unchanged from their originals. Can anyone take a look and help me out? I've been searching and can't really tell what the locations are supposed to be so I've been poking around in the dark a little bit.


why not just leave rear o2 plugged in and use 45 degree angle adapter to spoof system into believing all is well.
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prj
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« Reply #16 on: November 17, 2023, 05:02:18 AM »

why not just leave rear o2 plugged in and use 45 degree angle adapter to spoof system into believing all is well.
Because it can be coded out and a useless sensor removed?

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rzyao
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« Reply #17 on: November 17, 2023, 05:20:29 PM »

No luck, I've tried everything I could find. I also found a little list of locations and tried to zero out what I should, but it doesn't seem to have helped.

This is a table I found from an old thread, http://nefariousmotorsports.com/forum/index.php?topic=9369.0
Address;Name;Size
"$18196";"CDHSH";"1x1"
"$18197";"CDHSHE";"1x1"
"$1819A";"CDKAT";"1x1"
"$1819C";"CDLASH";"1x1"
"$1819E";"CDLATV";"1x1"
"$1819F";"CDLDP";"1x1"
"$181A2";"CDLSH";"1x1"
"$181A6";"CDNWS";"1x1"
"$181A7";"CDSLS";"1x1"
"$181AA";"CDTES";"1x1"
"$181B0";"CWKONABG";"1x1"
"$181B1";"CWKONLS";"1x1"
"$181B7";"CWKMMILSCT";"1x1"

Quote
why not just leave rear o2 plugged in and use 45 degree angle adapter to spoof system into believing all is well.

I was having an issue with my kind of mediocre test pipe and the oxygen sensor being clocked weirdly, it was hitting the frame and I really didn't want to deal with that. I was under the impression that the code outs on s4wiki would work to disable all the lights, but I can't seem to figure out how to deal with this one. I'm not having an issue with the reading it's giving me, only with it being upset that I actually unplugged the sensor (I was able to run it just fine with it plugged in, no light for cat efficiency threshold)
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fknbrkn
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mk4 1.8T AUM


« Reply #18 on: November 17, 2023, 09:40:53 PM »

There is a second esconf right after the first one sometimes

 Wink
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rzyao
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« Reply #19 on: November 18, 2023, 06:47:33 PM »

both of the potential locations that ME7Eskonf gave me had LSHHK set to not installed
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fknbrkn
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mk4 1.8T AUM


« Reply #20 on: November 18, 2023, 09:20:52 PM »

There is a second esconf right after the first one sometimes

Read again until you get it
« Last Edit: November 18, 2023, 09:23:02 PM by fknbrkn » Logged
JeanAwt
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« Reply #21 on: November 19, 2023, 12:37:10 AM »

FF   FF   00   F0   FF   FB   3F
FF   FF   00   00   FC   F8   33.....

I'm curious atw what year is it? early 00? narrow band?ignition with separate module?


   
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A4 B5 avant 1.8T 2000 NO QUATTRO
rzyao
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« Reply #22 on: November 21, 2023, 10:52:58 AM »

Read again until you get it

I have no idea how it worked and it didn't look like an actual ESKONF because the values were different but I changed the  byte pair that would be responsible for LSHHK and it fixed the issue.

FF   FF   00   F0   FF   FB   3F
FF   FF   00   00   FC   F8   33.....

I'm curious atw what year is it? early 00? narrow band?ignition with separate module?


It was sold in Feb 2000, so likely made in 99. Narrowband, no ICM.
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