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Thread: Multipe error codes- P0161 P0158 P1685

  1. #1
    Registered winkosmosis's Avatar
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    Default Multipe error codes- P0161 P0158 P1685

    I know P0161 and P0158 are for an O2 sensor, but I have no idea what the P1685 means.

    According to wjjeeps:
    P1685
    Skim Invalid Key
    The engine controller has received an invalid key from the SKIM.

    What in the hell does that mean?

    The others:
    P0161 (M)
    O2 Sensor Heater Circuit (Bank 2 Sensor 2)
    Oxygen sensor heater element malfunction. O2 sensor voltage greater than 3 volts for 60 to 240 seconds.

    0158 (M)
    O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
    Oxygen sensor input voltage maintained above normal operating range.


    Does that mean I just need to replace that O2 sensor?
    1999 XJ / 2" OME coils, 2" light duty leafs

  2. #2
    Registered winkosmosis's Avatar
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    I think the Skim Invalid Key refers to when I tried to start it with a copied key.

    So what O2 sensor do I need? After catalyst or before?
    1999 XJ / 2" OME coils, 2" light duty leafs

  3. #3
    Registered winkosmosis's Avatar
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    Would it kill wjjeeps to specify which O2 sensor goes with which code? This information is impossible to find on the internet.

    Edit: Checked FSM. 2/2 is the one after the cat- ordered it from chryslerpartsdirect. Does that mean that it's only used for emissions, and not to adjust air/fuel mixture? I'm worried about running it for so long with a busted O2 sensor.
    1999 XJ / 2" OME coils, 2" light duty leafs

  4. #4
    Registered oldgeezer's Avatar
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    Bank 2 = passenger side bank of cylinders, 4.7L

    Sensor 2 = after cat or downstream sensor

    Replacing the sensor is a reasonable thing to do.

    Even if you don't have a minicat for each cylinder bank, so that bank 1 or 2 has a definite meaning, sensor 2 is still the after cat sensor.
    2001 WJ Limited, 4.7L, Quadra-Drive -- Kenne Bell Supercharger, Stillen Rotors with MM pads (F/R), Addcos (F/R), Kolak 3 inch exhaust with large case MagnaFlow, Rogue Chrome wheels, DRL activated, and Blaupunkt 3.5" dash speakers.

  5. #5
    Registered winkosmosis's Avatar
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    Since I have the FSM now, I feel like an idiot for not ordering the O2 sensor. I didn't replace it before because I was in Yellowstone for the past 5 months, and I didn't realize how easy it would be to replace-- could have done it in the driveway. Can not replacing the sensor cause damage? Someone on another forum, in an unrelated thread, mentioned dilution of the oil by gasoline and destruction of the catalytic converter.
    1999 XJ / 2" OME coils, 2" light duty leafs

  6. #6
    Registered oldgeezer's Avatar
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    Not very likely that a bad after cat O2 sensor would make you run so rich that unburned fuel would mess up the oil or cat. You will be OK.

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