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O2 Sensor Fault (heating)

Discussion in 'A3/S3/Sportback (8P Chassis)' started by BB13, Dec 23, 2012.

  1. BB13
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    BB13 New Member

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    [Dec 23, 2012]
    Hi people

    I have a problem on my 2.0tsfi, The other day i had the EMLlight come up. I had DannyKn9 from here plug my car in and he gave me thereadings of the faults, what i will copy and put up on here. Basically the carhas a problem on the heater circuit its saying its on both sensors but i believeboth sensors use the same circuit so if one of the sensors heaters fails itshows up as both ?
    The first thing i did was to check the fuses all seem fine.Also i had a quick look around to make sure there was no damage to the loom orsenor leads and everything was fine. So i got the multimeter out and did aresistance test across the sensors heaters to see what reading i got. On thePre cat sensor (5 wire) i had a reading of 2.9ohm's and on the post cat sensor(4 wires) i had the reading of 9.1ohms would them readings be right ? Thanks any help would be great please.




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  3. BB13
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    BB13 New Member

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    [Dec 23, 2012]
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------

    Address 01: Engine Labels: 06F-907-115-AXX.lbl
    Control Module Part Number: 8P0 907 115 HW: 8P0 907 115
    Component and/or Version: 2.0l R4/4V TFSI 00 0130
    Software Coding: 01030003180F0060
    Work Shop Code: WSC 06314 000 00000
    VCID: EFE8CFDCFE8DFF6048F
    3 Faults Found:
    000048 - Oxygen (Lambda) Sensor B1 S1: Heating Circuit
    P0030 - 004 - Malfunction / Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 0
    Fault Frequency: 1
    Mileage: 114331 km
    Time Indication: 0
    Date: 2012.12.06
    Time: 13:06:16
    Freeze Frame:
    RPM: 1118 /min
    Load: 32.9 %
    Speed: 4.0 km/h
    Temperature: 46.0°C
    Temperature: 19.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.351 V
    000054 - Oxygen (Lambda) Sensor B1 S2: Heating Circuit
    P0036 - 004 - Malfunction / Open Circuit - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 0
    Fault Frequency: 1
    Mileage: 114333 km
    Time Indication: 0
    Date: 2012.12.06
    Time: 13:08:08
    Freeze Frame:
    RPM: 2073 /min
    Load: 11.0 %
    Speed: 52.0 km/h
    Temperature: 65.0°C
    Temperature: 12.0°C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.478 V
    001056 - Catalyst System; Bank 1
    P0420 - 002 - Efficiency Below Threshold - MIL ON
    Freeze Frame:
    Fault Status: 11100010
    Fault Priority: 0
    Fault Frequency: 2
    Mileage: 114357 km
    Time Indication: 0
    Date: 2012.12.07
    Time: 12:16:49
    Freeze Frame:
    RPM: 2433 /min
    Load: 30.2 %
    Speed: 93.0 km/h
    Temperature: 69.0°C
    Temperature: 14.0°C
    Absolute Pres.: 990.0 mbar
    Voltage: 14.478 V

    Readiness: 0000 0000
    #2
  4. BB13
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    BB13 New Member

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    [Dec 25, 2012]
    Merry Xmas people ;-)
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  5. Artimus
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    Artimus Short Back

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    [Dec 25, 2012]
    have you been using cheap fuel?
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  6. BB13
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    BB13 New Member

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    [Dec 25, 2012]
    Hi thanks for your reply. Nope been using mostly shell vpower, habbit from my old car as it only run on that. the light did come on from fuel the old own had put in the car come to think of it.
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  7. Artimus
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    Artimus Short Back

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    [Dec 25, 2012]
    had this with a couple of my past cars- the previous owners had used bargain basement stuff.

    Try removing & cleaning the lambda sensors to remove any soot build-up! I used wet & dry, then brake cleaner - worked a treat.
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  8. BB13
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    [Dec 25, 2012]
    I will give it a go, but dont think that would give a fault code for the heaters not to be working ?
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  9. radhaz
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    radhaz New Member

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    [Dec 25, 2012]
    Start with the easy stuff. Measure the heaters to see if you have an open heater. The procedure is in the Bentley service manual.
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  10. BB13
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    [Dec 25, 2012]
    Hi mate thanks for your reply

    I have, pre cat i got the reading of 2.0ohms and post cat 9.1ohms and ok i will have a look see if i can find the manaul online or some think.

    Thanks Billy
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  11. radhaz
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    radhaz New Member

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    [Dec 25, 2012]
    Sounds like your heaters are good. Here's the text from my Bentley:

    Oxygen Sensor O2S Heater, Checking
    Observe all safety precautions: Safety Precautions
    View clean working conditions: Clean Working Conditions
    Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
    For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
    Oxygen Sensor (O2S) Heater Z19 is part of Heated Oxygen Sensor (HO2S) G39 and cannot be replaced separately.
    Special tools, testers and auxiliary items required
    multimeter.
    Wiring diagram.
    Test requirements
    Fuse SB15 OK.
    Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
    Battery voltage at least 12.5 volts.
    All electrical consumers such as, lights and rear window defroster, switched off.
    Vehicles with automatic transmission, shift selector lever into position "P" or "N" .
    A/C switched off.
    Ground (GND) connections between engine/transmission/chassis OK.
    Ignition switched off.
    Test procedure
    Perform a preliminary check to verify the customers complaint. Refer to Preliminary Check .
    Start diagnosis
    Remove the engine cover with air filter. Refer to the appropriate service manual.
    Checking internal resistance

    Disconnect the Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 1 - .
    Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 terminals 3 to 4 for resistance.
    Specified value: 2.5 to 10.0 Ω (at approx. 20 degree C)
    If the specification was not obtained:
    Replace the Heated Oxygen Sensor (HO2S) G39 . Refer to the appropriate service manual.
    If the specification was obtained:
    Checking voltage supply
    Crank the engine (engine may run).

    Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to Ground (GND) for voltage.

    Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal Engine Control Module (ECM) J623 electrical harness connector T94 terminal or test box socket
    4 Ground (GND)
    Switch the ignition off.
    Specified value: Battery voltage.
    If the specification was not obtained:
    Check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).
    Check the electrical harness connector for damage, corrosion, loose or broken terminals.
    If necessary, repair the faulty wiring connection.
    If the specification was obtained:
    Checking Ground (GND) activation
    If the manufacturers test box is being used, perform the following step.
    Install the test box.
    If the manufacturers test box is not being used, perform the following step.
    Remove the Engine Control Module (ECM) J623 . Refer to the appropriate service manual.

    Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 3 to the Engine Control Module (ECM) J623 electrical harness connector T94 terminal 73 for resistance.

    Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal Engine Control Module (ECM) J623 electrical harness connector T94 terminal or test box socket
    3 73
    Specified value: 1.5 Ω max.
    If the specification was not obtained:
    Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
    Check the electrical harness connector for damage, corrosion, loose or broken terminals.
    If necessary, repair the faulty wiring connection.
    If no malfunction is detected in the wiring and if the voltage supply was OK:
    Erase the DTC memory. Refer to Diagnostic Mode 04 - Erase DTC Memory .
    Perform a road test to verify repair.
    If the DTC does not return:
    Generate readiness code. Refer to Readiness Code .
    If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
    Replace the Engine Control Module (ECM) J623 . Refer to the appropriate service manual.
    Final procedures
    After the repair work, the following work steps must be performed in the following sequence:
    Check the DTC memory. Refer to .
    If necessary, erase the DTC memory. Refer to .
    If the DTC memory was erased, generate readiness code. Refer to
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  12. BB13
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    BB13 New Member

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    [Dec 26, 2012]
    Thank you very much, just the info i need.
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