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Thread: 2006 Audi S4 Avant Manual missfire issues

  1. #11
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by cdsjklee View Post
    someone told me my S4 may have clogged cat. but I do not have any CEL for Clogged cat or oxygen sensor. what do you guys think?
    it gets worse as temp goes up.
    Remove before-CAT oxygen sensor and use a bore-scope "snake" camera to do a visual inspection? Those things are pretty cheap now; many will work with a smart-phone:
    https://www.amazon.com/s?k=endoscope

    -Uwe-
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  2. #12
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    Removed Bank 1 cat (passenger side), It looks OK.
    Do not see any broken pieces and I did shake the cat no rattling sound.
    but as I mention before Bank 1 side exhaust is very weak compare to Driver side. Exhaust out put should be same on both side or is it normal to have ones side a lot more stronger than other side ?
    I connected vacuum to Pre cat side of pipe and checked to see any air movements through the pipe.
    it does move air but very of weak I am not sure how strong it should move air . Is there a better way to check if cat is clogged ?

  3. #13
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by cdsjklee View Post
    Exhaust out put should be same on both side or is it normal to have ones side a lot more stronger than other side ?
    I would also expect it to be close to equal, but I do not have a good mental (or any other kind of) picture of this exhaust system. Is it fully separate or are there one or more cross-overs or common paths?

    -Uwe-
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  4. #14
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    looks like they are fully separated.
    found picture here.https://forum.rs246.com/viewtopic.php?t=126582

  5. #15
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    looks like they are fully separated.
    found picture here.https://forum.rs246.com/viewtopic.php?t=126582
    https://i.imgur.com/vGa1C.jpg[/IMG]

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  7. #16
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    Have the front pre-CAT Lambda sensors been changed? Most pre-CAT Lambda sensors are only good for about 50K-60K miles then they get sluggish.
    You mention you have changed many parts on this engine but do not mention replacing these sensors.
    Maybe one has been replaced previously and is working OK while the other is sluggish.
    The car ignores these sensors until the engines has warmed-up so if it runs OK cold, this could be another pointer towards the Lambda sensors.

    I also recommend performing a compression test on each cylinder. I have seen hairline cracks in the head cause similar issues once the engine gets hot.

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  9. #17
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    Hello.
    I managed to resolve the missfire issues.
    car runs well now drive about 80 miles with no issues but now I have one fault code P0421 (expected since I have gutted pre cat bank1) It looked fine but it was at lest 90% clogged.
    After gutted pre cat exhaust output was a lot more stronger. Now need install a new cat on bank1 now.
    need to get a smog check but readiness is not ready after 80 miles of driving.


    Code:
    Friday,22,November,2019,12:22:12:62900
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
    VCDS Version: 19.6.2.0  HEX-V2 CB: 0.4508.4
    Data version: 20190930 DS308.0
    www.Ross-Tech.com
    
    
    VIN: WAUUL78E26A135028   License Plate: 111
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 9 : Calibration Identification
    
    Type 02 - VIN : WAUUL78E26A135028 (Address E8)
    Type 04 - Calibration ID : 8E2910560   0030 (Address E8)
    Type 06 - Calibration Verification Number : 8D4973D0 (Address E8)
    Type 08 - In-use performance tracking :
        OBD Monitoring Conditions Encountered count : 2501
        Ignition cycle count : 12098
        Conditions completion count / Specified conditions encountered count
             Catalyst monitor bank 1 : 3641 / 2496
             Catalyst monitor bank 2 : 3629 / 2496
             O2 Sensor monitor bank 1 : 1882 / 2501
             O2 Sensor monitor bank 2 : 1839 / 2501
             EGR-VVT monitor : 0 / 0
             AIR monitor : 0 / 0
             EVAP monitor : 452 / 849
    Saturday,23,November,2019,14:52:14:62900
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
    VCDS Version: 19.6.2.0  HEX-V2 CB: 0.4508.4
    Data version: 20190930 DS308.0
    www.Ross-Tech.com
    
    
    VIN: WAUUL78E26A135028   License Plate: 111
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 03: Emission related fault codes
    
    Address 7E8: 1 Fault Found:
    P0421 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 01 - PID 01 : Readiness  --  Address 7E8
    
    Number of DTCs stored: 1  --  MIL Status: MIL ON
    Misfire monitoring:  Passed
    Fuel System:  Passed
    Comprehensive Components:  Passed
    Catalyst monitoring:  Passed
    Heated catalyst monitoring: Not installed.
    Evaporative system monitoring:  Passed
    Secondary air system monitoring:  Passed
    A/C system refrigerant monitoring: Not installed.
    Oxygen sensor monitoring:  Passed
    Oxygen sensor heater monitoring:  Passed
    Exhaust Gas Recirculation: Not installed.
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 01 - PID 01 : Readiness  --  Address 7E8
    
    Number of DTCs stored: 1  --  MIL Status: MIL ON
    Misfire monitoring:  Passed
    Fuel System:  Passed
    Comprehensive Components:  Passed
    Catalyst monitoring:  Passed
    Heated catalyst monitoring: Not installed.
    Evaporative system monitoring:  Passed
    Secondary air system monitoring:  Passed
    A/C system refrigerant monitoring: Not installed.
    Oxygen sensor monitoring:  Passed
    Oxygen sensor heater monitoring:  Passed
    Exhaust Gas Recirculation: Not installed.
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 01 - PID 01 : Readiness  --  Address 7E8
    
    Number of DTCs stored: 1  --  MIL Status: MIL ON
    Misfire monitoring:  Passed
    Fuel System:  Passed
    Comprehensive Components:  Passed
    Catalyst monitoring:  Passed
    Heated catalyst monitoring: Not installed.
    Evaporative system monitoring:  Passed
    Secondary air system monitoring:  Passed
    A/C system refrigerant monitoring: Not installed.
    Oxygen sensor monitoring:  Passed
    Oxygen sensor heater monitoring:  Passed
    Exhaust Gas Recirculation: Not installed.
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    Code:
    Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
              67 69 75 76 77
     
    VIN: WAUUL78E26A135028   Mileage: 141020km-87625miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 079-910-560-BBK.lbl
       Part No SW: 8E2 910 560     HW: 8E2 907 560 
       Component: 4.2L V8/5V      G   0030  
       Revision: --H01---    Serial number:               
       Coding: 0007711
       Shop #: WSC 26147 444 51445
       VCID: 6491AC2C0254E4674DF-8030
    
    1 Fault Found:
    16805 - Warm Up Catalyst; Bank 1 
                P0421 - 001 - Efficiency Below Threshold - MIL ON
                 Freeze Frame:
                        Fault Status: 11100001
                        Fault Priority: 0
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 140981 km
                        Time Indication: 0
    
                 Freeze Frame:
                        RPM: 2638 /min
                        Load: 22.7 %
                        Speed: 53.0 km/h
                        Temperature: 93.0°C
                        Temperature: 21.0°C
                        Absolute Pres.: 1000.0 mbar
                        Voltage: 13.716 V
    
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8E0-910-517.clb
       Part No SW: 8E0 910 517 E    HW: 8E0 614 517 AL
       Component: ESP8 quattro    H05 0120  
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0004901
       Shop #: WSC 06325 000 00000
       VCID: 290FFD1825F6790FBE9-807C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
       Part No: 8E0 820 043 BM
       Component:   A4 Klimaautomat   2832  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 6D87C908D48EA52F121-50D0
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl
       Part No: 8E0 907 279 L
       Component: int. Lastmodul  USA 0504  
       Coding: 11023
       Shop #: WSC 65536  
       VCID: 3B233750DA7AFB9FDC5-4AA4
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 0F: Digital Radio        Labels: 8E0-035-593-XM.lbl
       Part No SW: 8E0 035 593 E    HW:             
       Component: SDAR XM              
       Revision:             Serial number: AUZ4Z7E8036892
       Shop #: WSC 00000 000 00000
       VCID: 2B0307102F2A6B1F4C5-513C
    
    1 Fault Found:
    02635 - Tuner Not Enabled/Activated 
                000 - -
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 8E0-959-655-94.lbl
       Part No SW: 8E0 959 655 H    HW: 8E0 959 655 H
       Component:    Airbag 9.41  H11 3540  
       Revision: 91H1135    Serial number: 0036N0011GCJ  
       Coding: 0032607
       Shop #: WSC 06325 000 00000
       VCID: 3C21344CDA64FCA7D5F-8068
    
       Subsystem 1 - Part No: 8E0 910 339 B
       Component: BF-Gewichtsens. 002 0070
    
       Subsystem 2 - Serial number: 35NRL         
    
       Subsystem 3 - Serial number: 0001.01.000000200000000000˙†63
    
       Subsystem 4 - Serial number: 000000˙†6332DRB4022A932EP˙†63
    
       Subsystem 5 - Serial number: A932EP˙†6342DRB4025189A4N˙†63
    
       Subsystem 6 - Serial number: 189A4N˙†6352ARB400B524DCT˙†63
    
       Subsystem 7 - Serial number: 524DCT˙†6362ARB400B3CE80V˙†63
    
       Subsystem 8 - Serial number: 3CE80V˙†63729RB400C58452J˙†63
    
       Subsystem 9 - Serial number: 58452J˙†63829RB400C58462L˙
    
       Subsystem 10 - Serial number: 58462L˙
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 8E0-953-549.lbl
       Part No: 8E0 953 549 Q
       Component: Lenksáulenmodul     0601  
       Coding: 04042
       Shop #: WSC 06325  
       VCID: 41DF45B8B896914F869-4AA4
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8E0 920 982 C    HW: 8E0 920 982 C
       Component: KOMBI+WFS 4     H12 0110  
       Revision: 0110        Serial number: 00000000000000
       Coding: 0023261
       Shop #: WSC 26147 444 58994
       VCID: 2E050E041C081E376BB-5118
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.lbl
       Part No SW: 8E0 920 982 C    HW: 8E0 920 982 C
       Component: KOMBI+WFS 4     H12 0110  
       Revision: 0110        Serial number: 00000000000000
       Coding: 0023261
       Shop #: WSC 26147 444 58994
       VCID: 2E050E041C081E376BB-5118
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 36: Seat Mem. Drvr        Labels: 8E0-959-760.lbl
       Part No: 8E0 959 760 
       Component: Sitzmemory R2 F     0305  
       Coding: 00002
       Shop #: WSC 00000  
       VCID: 71BFD578C88641CF369-4B1E
    
    2 Faults Found:
    01336 - Company Data Bus for Comfort System 
                37-10 - Faulty - Intermittent
    01336 - Company Data Bus for Comfort System 
                80-10 - Single-Wire Operation - Intermittent
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb
       Part No: 8E0 959 433 BT
       Component: Komfortgerát T7B    3332  
       Coding: 12092
       Shop #: WSC 06325  
       VCID: 04518CACE7044467EDF-4AA4
    
       Subsystem 1 - Part No: 8E1959801G
       Component: Tőrsteuer.FS BRM 0506  
    
       Subsystem 2 - Part No: 8E1959802E
       Component: Tőrsteuer.BF BRM 0205  
    
       Subsystem 3 - Part No: 8E0959801E
       Component: Tőrsteuer.HL BRM 0606  
    
       Subsystem 4 - Part No: 8E0959802E
       Component: Tőrsteuer.HR BRM 0606  
    
    5 Faults Found:
    01336 - Company Data Bus for Comfort System 
                80-10 - Single-Wire Operation - Intermittent
    01331 - Door Control Module; Driver Side (J386) 
                80-10 - Single-Wire Operation - Intermittent
    01332 - Door Control Module; Passenger Side (J387) 
                80-10 - Single-Wire Operation - Intermittent
    01333 - Door Control Module; Rear Left (J388) 
                80-10 - Single-Wire Operation - Intermittent
    01334 - Door Control Module; Rear Right (J389) 
                80-10 - Single-Wire Operation - Intermittent
    
    -------------------------------------------------------------------------------
    Address 55: Headlight Range        Labels: 4F0-910-357.lbl
       Part No SW: 4F0 910 357 E    HW: 4F0 907 357 E
       Component: AFS 1           H01 0010  
       Revision: 00000001    Serial number:               
       Coding: 0000019
       Shop #: WSC 06325 000 00000
       VCID: 2809F81C3EFC4007A17-807C
    
       Subsystem 1 - Part No: 8E0 941 329 
       Component: AFS-Modul links H03 0020
    
       Subsystem 2 - Part No: 8E0 941 329 
       Component: AFS-Modul rechtsH03 0020
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 8E0-035-192-RNSE.clb
       Part No SW: 8E0 035 192 F    HW: 8E0 035 192 F
       Component: RNS-E US3       H70 0110  
       Revision:      01S    Serial number: AUZBZ7E2002903
       Coding: 0309637
       Shop #: WSC 06431 176 52258
       VCID: 270BFB2033C24F7FA8D-513C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 65: Tire Pressure        Labels: 8E0-907-273.lbl
       Part No SW: 8E0 907 273     HW: 8E0 907 273 
       Component: Reifendruck 3   H03 0110  
       Coding: 0063022
       Shop #: WSC 06435 000 00000
       VCID: 698FBD18E556B90F7E9-513C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 77: Telephone        Labels: 8P0-862-335.lbl
       Part No SW: 8P0 862 335 G    HW: 8P0 862 335 G
       Component: FSE_255x BT     H21 0190  
       Revision: 00000001    Serial number: 00000000331627
       Coding: 0011877
       Shop #: WSC 06325 000 00000
       VCID: 3A2D3254D040C297C73-50D0
    
    No fault code found.
    
    End----------(Elapsed Time: 05:14, VBatt start/end: 12.4V/12.3V)-----------
    Code:
    Saturday,23,November,2019,15:03:35:62900
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
    VCDS Version: 19.6.2.0  HEX-V2 CB: 0.4508.4
    Data version: 20190930 DS308.0
    www.Ross-Tech.com
    
    
    
    
    Freeze Frame Data for address 7E8
        PID02 DTC that caused freeze frame data storage: P0421 
        PID03 Fuel system 1/2 status: Closed loop, using O2 sensors
                  ... Closed loop, using O2 sensors
        PID04 Calculated load value: 22.7 % 
        PID05 Engine coolant temperature: 93 °C 
        PID06 Short Term Trim - Bank 1: 0.0 % 
        PID07 Long Term Trim - Bank 1: 0.8 % 
        PID08 Short Term Trim - Bank 2: 1.6 % 
        PID09 Long Term Trim - Bank 2: -3.1 % 
        PID0C Engine RPM: 2638 /min 
        PID0D Vehicle speed: 53 km/h 
        PID0E Ignition timing advance for cyl #1: 38.0 Degrees 
        PID0F Intake air temperature: 21 °C 
        PID10 Mass Air Flow: 21.08 g/s 
        PID11 Throttle position sensor: 15.7 % 
        PID12 Secondary Air Status: Atmosphere/off 
        PID1F Time since engine start: 851 s 
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Mode 03: Emission related fault codes
    
    Address 7E8: 1 Fault Found:
    P0421 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold
    Last edited by Uwe; 11-23-2019 at 07:52 PM. Reason: CODE tags

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