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  1. #1
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    Check Engine Light- P0161 02 sensor heater circuit

    My car came back after being tuned by eurocharged with this code P0161 02 sensor heater circuit any ideas of the cause?
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    2008 Lexus LS600hl
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    Going to be tough to diagnose over the internet but bump for help.

    If it is a heater circuit could be something with the climate control I would think which would be completely unrelated to any tuning?

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    1 out of 1 members liked this post. Yes Reputation No
    It's your O^2 sensor. Are you still running a narrowband sensor with your long tubes? Wideband? No O^2?

    If the former, just check the connections. If the connection is good, the sensor is toast.

    If the latter, it needs to be turned off in the ECU.
    Last edited by Benz-O-Rama; 06-28-2011 at 11:29 PM.
    2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
    2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.02@126)

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    Click here to enlarge Originally Posted by Benz-O-Rama Click here to enlarge
    It's your O^2 sensor. Are you still running a narrowband sensor with your long tubes? Wideband? No O^2?

    If the former, just check the connections. If the connection is good, the sensor is toast.

    If the latter, it needs to be turned off in the ECU.
    There we go, thanks for the help.

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    Click here to enlarge Originally Posted by Benz-O-Rama Click here to enlarge
    It's your O^2 sensor. Are you still running a narrowband sensor with your long tubes? Wideband? No O^2?

    If the former, just check the connections. If the connection is good, the sensor is toast.

    If the latter, it needs to be turned off in the ECU.
    great one more thing to fix, ill have it checked out thanks!!!!
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    2008 Lexus LS600hl
    2006 CLS55 AMG.
    508whp/564tq.
    171mph at The Texas mile 2011.
    Mods Everything.
    Going fast with class!!

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    So wait, which one is it?

    Stock narrow band?
    Aftermarket wide band?
    Or no 0^2 sensor at all?
    2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
    2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.02@126)

    Click here to enlargeClick here to enlarge
    http://www.youtube.com/watch?v=jqKECRhvlf4

    Powered by:Click here to enlarge

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    Click here to enlarge Originally Posted by Benz-O-Rama Click here to enlarge
    So wait, which one is it?

    Stock narrow band?
    Aftermarket wide band?
    Or no 0^2 sensor at all?
    Stock narrow's but the rear's are turned off.
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    2008 Lexus LS600hl
    2006 CLS55 AMG.
    508whp/564tq.
    171mph at The Texas mile 2011.
    Mods Everything.
    Going fast with class!!

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    1 out of 1 members liked this post. Yes Reputation No
    Usually bad wiring to the 02 or a dead 02 completely. Easy fix.

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    Click here to enlarge Originally Posted by BrenM3 Click here to enlarge
    Usually bad wiring to the 02 or a dead 02 completely. Easy fix.
    awesome thanks!!!!
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    2008 Lexus LS600hl
    2006 CLS55 AMG.
    508whp/564tq.
    171mph at The Texas mile 2011.
    Mods Everything.
    Going fast with class!!

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    Click here to enlarge Originally Posted by Full Throttle Click here to enlarge
    Stock narrow's but the rear's are turned off.
    The rear's won't throw a code, normally. Only the one up front before the primary cats. So yeah, connector could be loose at the bung. Your car has over 60K miles right? Could just be time for a new sensor. It's seriously a 15 minute job. If you're gonna replace it, might as well do a wide band and run an AFR gauge.
    2004 E500 - Eurocharged ECU, VRP headers and E55 exhaust. #1 record holder on dragtimes (13.49@102.5)
    2005 SL600 - OE Tuning ECU/ Speedriven TCU - #1 record holder on dragtimes (11.02@126)

    Click here to enlargeClick here to enlarge
    http://www.youtube.com/watch?v=jqKECRhvlf4

    Powered by:Click here to enlarge

  11. #11
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    Click here to enlarge Originally Posted by Benz-O-Rama Click here to enlarge
    The rear's won't throw a code, normally. Only the one up front before the primary cats. So yeah, connector could be loose at the bung. Your car has over 60K miles right? Could just be time for a new sensor. It's seriously a 15 minute job. If you're gonna replace it, might as well do a wide band and run an AFR gauge.
    02 sensors were changed in the last couple hundred miles.
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    2008 Lexus LS600hl
    2006 CLS55 AMG.
    508whp/564tq.
    171mph at The Texas mile 2011.
    Mods Everything.
    Going fast with class!!

  12. #12
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    Click here to enlarge Originally Posted by Full Throttle Click here to enlarge
    02 sensors were changed in the last couple hundred miles.
    Could be the wiring as well not just the sensors themselves.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Could be the wiring as well not just the sensors themselves.
    Im taking it to the dealer Monday ill report what they find.
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    2008 Lexus LS600hl
    2006 CLS55 AMG.
    508whp/564tq.
    171mph at The Texas mile 2011.
    Mods Everything.
    Going fast with class!!

  14. #14
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    check your "grouds" too

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