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Author Topic: Sensor Removal and DTC Cel Flags  (Read 34686 times)
RaraK
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« on: October 03, 2009, 09:49:33 AM »

ok, so want to make a list of removal of 2nd 02's, and dtc that go along with it?, as well as EGT's(some people do this) and set readiness for the US OBD2 emmisions testing

ive done this but have issues with a CEL yet.

CDKAT set to 0
CDHSV set to 0
CDHSH set to 0
and in the x106e range there is a DTC cel table, flags for setting the CEL.  zeroed out the rear o2's so they can be unplugged

only CEL i get is for cat heating now? even though the readiness sets, what am i missing anyone know?
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robin
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« Reply #1 on: October 03, 2009, 08:31:46 PM »

These are what I disable in my M box file, no MIL even after 4 weeks of adaptation.

Code:
loc     new old     desc

1819E: 00 01 Kill OXS DTCs
181A2: 00 01 Kill CAT Efficiency DTCs
181AA: 00 01 Kill OXS DTCs

And here's my reference list:

Code:
Mem
Loc     Default  DTCs    DESCRIPTION
-----   -------  ----    -------------------------------------------------
18196   01       P1462
                 P1460
                 P1461
                 P1456   EGT Sensor Related

18197   01       P1453
                 P1454
                 P1455
                 P1457
                 P1458
                 P1459

18198   00       P1479

18199   00       P1912
                 P1913
                 P1479

1819D   01       P1620
                 P1621
                 P1622
                 P1654


1819E   01       P1114   Bank1 Sensor2 - O2S Internal Resistance too high
                 P1140   Bank2 Sensor2 - O2S Internal Resistance too high

1819F   01       P1105   Bank1 Sensor2 - O2S Short to B+
                 P1110   Bank2 Sensor2 - O2S Short to B+
                 P1117   Bank1 Sensor2 - O2S Short to Ground
                 P1118   Bank1 Sensor2 - O2S Open Circuit
                 P1121   Bank2 Sensor2 - O2S Short to Ground
                 P1122   Bank2 Sensor2 - O2S Open Circuit
                 P1198   ???
                 P1199   ???

181A0   01       P1102   Bank1 Sensor1 - O2S Short to B+
                 P1107   Bank2 Sensor1 - O2S Short to B+
                 P1113   Bank1 Sensor1 - O2S Internal Resistance too high
                 P1115   Bank1 Sensor1 - O2S Short to Ground
                 P1116   Bank1 Sensor1 - O2S Open
                 P1119   Bank2 Sensor1 - O2S Internal Resistance too high
                 P1120   Bank2 Sensor1 - O2S Short to Ground
                 P1131   Bank2 Sensor1 - O2S Open

181A2   01       P0421  Warm Up Catalyst: Bank 1: Efficiency Below Threshold
                 P0431  Warm Up Catalyst: Bank 2: Efficiency Below Threshold

181A3   01       P1111   O2 Control Bank1 - Too Lean
                 P1112   O2 Control Bank1 - Too Rich
                 P1127   Long Term Fuel Trim Bank1 - Too Rich
                 P1128   Long Term Fuel Trim Bank1 - Too Lean
                 P1129
                 P1130
                 P1136   Long Term Fuel Trim Bank1 (Additive) - Too Lean
                 P1137   Long Term Fuel Trim Bank1 (Additive) - Too Rich
                 P1138
                 P1139
                 P1147
                 P1148
                 P1149   O2 Control Bank1 - Out of Range
                 P1150

181A4   01       P0139   Bank1 Sensor2 Slow Response
                 P0159   Bank2 Sensor2 Slow Response

181A5   01       P0133   Bank1 Sensor1 Slow Response
                 P0153   Bank2 Sensor1 Slow Response

181A6   01       P1176   Bank1 O2 Correction behind catalyst limit reached
                 P1177   Bank2 O2 correction behind catalyst limit reached

181A7   01       P0442   EVAP System: Small Leak Detected
                 P0455   EVAP System: Huge Leak Detected
                 P0456
                 P1475   EVAP LDP Circuit: Signal Circuit Open
                 P1476   EVAP LDP Circuit: Insufficient Vacuum
                 P1477   EVAP LDP Circuit: Malfunction
                 P1478   EVAP LDP Circuit: Clamped Tube Detected

181A8   01       P0506   Idle Control System RPM Lower than expected
                 P0507   Idle Control System RPM Higher than expected

181AA   01       P0136   Bank1 Sensor2 Malfunction
                 P0137   Bank1 Sensor2 Low Voltage
                 P0138   Bank1 Sensor2 High Voltage
                 P0140   Bank1 Sensor2 No Activity
                 P0156   Bank2 Sensor2 Malfunction
                 P0157   Bank2 Sensor2 Low Voltage
                 P0158   Bank2 Sensor2 High Voltage
                 P0160   Bank2 Sensor2 No Activity

181AB   01       P3262

181AC   01       P0130   Bank1 Sensor1 Malfunction
                 P0131   Bank1 Sensor1 Low Voltage
                 P0132   Bank1 Sensor1 High Voltage
                 P0134   Bank1 Sensor1 No Activity
                 P0150   Bank2 Sensor1 Malfunction
                 P0151   Bank2 Sensor1 Low Voltage
                 P0152   Bank2 Sensor1 High Voltage
                 P0154   Bank2 Sensor1 No Activity

181AE   01       P0300           Random/Multiple Cyclinder Misfire
                 P0301-P0306     Individual Cylinder Misfires Detected

181B0   00       P1411   Secondary Air Inj Sys Related?? (P0411/... on 2001 S4)
                 P1414
                 P1423
                 P1424

181B1   01       P1250   Fuel Level Too Low DTC

181B2   01       P0441   EVAP Emission Control System - Incorrect Purge Flow




         00 = Disable DTC
         01 = Enable  DTC
[/code
« Last Edit: October 03, 2009, 08:42:42 PM by robin » Logged
Tony@NefMoto
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2001.5 Audi S4 Stage 3


« Reply #2 on: October 05, 2009, 11:09:35 AM »

Glad to see you guys are finding the forums a useful place to ask questions. Cheesy

I have completely removed the rear O2 sensors on my car.

There are settings in the ecu where you can specify that the car only has two oxygen sensors and not four. But if you do this you won't set the readiness flags, because the rear oxygen sensors never get tested.

So the best way to remove the rear oxygen sensors is to disable the diagnostic checks for the oxygen sensors, catalytic converter efficiency tests, and the oxygen sensor heaters. You also need to disable the DTC for the oxygen sensor heater amplifiers.

I will try to post the abbreviations for these things later.

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RaraK
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« Reply #3 on: October 05, 2009, 06:04:03 PM »

well i have the rear o2's removed by switching them off(euro coding)

then the DTC's related to them unplugged

cat heating diagnosis before and after cats off

still get a cel for the cat heating! grrrrr

readiness is set btw
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RaraK
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« Reply #4 on: October 05, 2009, 06:10:49 PM »

That list is uber handy robin!!!!!!!!

so my mistake was removing some DTC in the 0x106AD range, i removed for the rear 02's, those are just the MIL lights in that area i think.

the 0x1819(x) area is the actual parameters for the ecu to read to monitor something or not, whereas the 0x106AD area you can set 0 to just "ignore" cel?
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Tony@NefMoto
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2001.5 Audi S4 Stage 3


« Reply #5 on: October 05, 2009, 09:01:32 PM »


Here is everything I use to remove my oxygen sensors and prevent any error codes while still passing readiness. These addresses are from an MBox.

Enable/Disable Diagnosis:
0x81819E, Post cat O2 heater diagnosis
0x81819F, Post cat O2 heater amplifier diagnosis
0x8181AA, Post cat O2 sensor diagnosis
0x8181A2, Catalytic converter efficiency diagnosis

Enable/Disable Fault Code:
0x8106F0, Error Class: Bank 1 post cat O2 sensor heater
0x8106F1, Error Class: Bank 2 post cat O2 sensor heater
0x8106F2, Error Class: Bank 1 post cat O2 sensor heater amplifier
0x8106F3, Error Class: Bank 2 post cat O2 sensor heater amplifier
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RaraK
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« Reply #6 on: October 07, 2009, 12:05:05 PM »

seems as the diagnosis is the same in a few files ive seen, DTC's are in a different place though

im getting for my Hbox

0x106ec
0x106ed
0x106ee
0x106ef

respectively to your's.... and the gbox is different as well(what i go off of to find some stuff)

« Last Edit: October 07, 2009, 12:20:58 PM by RaraK » Logged
skinnytirez
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« Reply #7 on: December 29, 2009, 06:11:00 PM »

I'll paypal someone $20 to post an idiot proof DIY on how to do this to my A box...
e-mail me at awj@ku.edu if you prefer
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audi_skydiver
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« Reply #8 on: January 02, 2010, 12:07:30 AM »

I'll paypal someone $20 to post an idiot proof DIY on how to do this to my A box...
e-mail me at awj@ku.edu if you prefer

Agreed... i would also like this... i have 2 bad EGT's in my car and just want to code them out!

Josh
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TWiST
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« Reply #9 on: April 04, 2010, 01:48:42 PM »

I desperatly need to pass smog my registration was due on march 10th and I am throwing codes for my o2's after gutting my precats and I am using the spacers and my EGTs are bad right now. I just ordered a KWP2000+ cable and it should be here next week I am going to pull down my bin file and post it up here and hopefully somebody can help me out. It seems from what ive read I just need to know the offset for the AA box Ecu and I can do this myself ? I have hex edited files before and what not but I just need to know the exact offsets to edit for the AA box. I will post up again once I get my cable and do some playing around and am more on par with everybody else.
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TWiST
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« Reply #10 on: April 12, 2010, 01:28:45 PM »

Now that I see whats going on that is fantastic information Robin!!! Thanks!

Where did you get that list ? Or did you just put it together yourself ?
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TWiST
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« Reply #11 on: April 12, 2010, 02:21:02 PM »

So in the attached pic you can see the top is the AA ecu and the bottom is the M and in regards to the DTC section outlined it appears both ECUs have the same information.
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TWiST
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« Reply #12 on: April 12, 2010, 03:17:35 PM »

So as Tony suggested I checked the 8106F section on both the AA and the M and I dont think I can change anything there ? Am I reading the HEX locations wrong or what ? Check out my attached pic, thanks!
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TWiST
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« Reply #13 on: April 15, 2010, 06:41:03 PM »

The last screenshot was totally wrong that I posted and I cant edit it. Anyways so I see the 03 sections and from someone extremely intelligent  Wink he told me to zero out the following on the AA box.

1819e
1819f
181a2
1077f
10780
10781
10782

I did and I am not throwing codes anymore for o2 which is fantastic but when I start the car and check readiness I get the attached screenshot. I am still getting my codes for my EGT sensors as they are both bad, but thats my next hurdle once I get thru this o2 madness, I am also unsure why I am getting a readiness issue for SAI

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audi_skydiver
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« Reply #14 on: April 16, 2010, 11:04:11 PM »

Use this for the readiness problem:

http://forums.vwvortex.com/zerothread?id=2690505

Josh
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