2001 Catera throttle body and O2 sensors
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Cadillac Catera and Cimarron Forum Discussion, 2001 Catera throttle body and O2 sensors in Past Cadillac Vehicle Discussion; Hi Folks, If the throttle body is bad could it cause O2 sensors (bank1 sensor 2 and bank sensor 2) ...
  1. #1
    retho78 is offline Cadillac Owners Enthusiast
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    2001 Catera throttle body and O2 sensors

    Hi Folks,


    If the throttle body is bad could it cause O2 sensors (bank1 sensor 2 and bank sensor 2) to act up and throw a CEL. I replaced the O2 sensor on one side but still getting code no heater circuit and other side I don't remember the description exactly but both were the O2 codes.


    I ran a live data with my code reader and it was reading the O2s so not sure why it would say no heater circuit.


    Any help is appreciated.....thanks.

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  3. #2
    marko69 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    How about swap the O2 sensors, or the connectors if you can, and see if the code changes.

  4. #3
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    okay, I'll try swapping the O2s not sure if that'll make any differences because my scanner with live data was reading it.

  5. #4
    marko69 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    I only suggest that as a starting point just to rule out the oxygen sensors. If the codes don't change, then you can rule out the O2 sensors. You can also check that you have 12vdc on at least one of the wires on the connectors. If you don't you might have a blown heater ckt fuse. The heater ckt is separate from the sensor ckt which would explain that you are still getting a reading from the sensor.

  6. #5
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    Okay, thanks. How do I check for the 12vdc and where's this fuse located? Also, when the code P0161 (bank 2 sensor 2) came on at first I replaced the sensor with a new one from rockauto.com (APWI Part # AP4251) and then the next day CEL came on and it read two codes P0161 (bank 2 sensor 2) and P0140 (bank 1 sensor 2 heater circuit).

    My question now is, could the new sensor (APWI part #AP4251) have cause this problem?

    Thanks.

  7. #6
    marko69 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    First off, I see your getting codes 160 and 161?? My service manual shows both of those codes for bank 2 sensor 2. Did you replace the correct O2 sensor?

    DTC P0160 HO2S Circuit Insufficient Activity Bank 2 Sensor 2
    DTC P0161 HO2S Heater Performance Bank 2 Sensor 2

  8. #7
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    sorry one of the code is P0140 instead of P0160

    yes, replaced the O2 post cat (passenger side) bank 2 sensor 2 code P0160 came on first. The next day code P0140 came on so not sure what to do. I couldn't locate the fuse for the O2 either.


    Thanks.

  9. #8
    marko69 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    Make sure the key is off, then disconnect the O2 sensor at the connector. Turn the key on. With the black lead of the mulitmeter, find a good ground point on the chassis. Connect the red led to one of the pins on the connector that goes toward the engine. Check the pins until you find one with 12vdc. This is the heater voltage from fuse 43 in the ECM. Check the connector of the sensor on the opposite side as well. (don't worry about the fuse just yet)

  10. #9
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    Okay, thanks. I checked the voltage and getting 12vdc at both sides of the O2s so pretty sure the fuse is good. Also, the CEL came back on this morning after I turned it off last night. I scanned it this afternoon and it showed only P0140, bank 1 Sensor 2 heater circuit. Any idea where to go from here for this code?


    Anyways, I swapped the sensors, cleaned the connectors and secured everything back. I'll let you know if CEL comes back on again.

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    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    Okay, here is the update...

    After swapping the sides on the rear O2 sensors we drove around and there was no CEL. Then this morning the CEL came back and it read the same two codes P0140 - O2 Circuit No Activity Detected Bank 1 Sensor 2 and P0161 - O2 Heater Circuit Bank 2 Sensor 2. I checked voltage last night and it was reading 12Vdc at both connection.

    Also, when I checked the resistance on the old O2 sensors it was showing 8.5 each whereas the new one from rockauto.com APWI part #AP4251 was showing a resistance of around 13.

    I have no clue what to do now, either get another sensor for the other side and see if it'll fix the O2 issues or track some other problem in the system.

    Also, should I stick with Bosch brand O2s or the APWI will be fine? I checked with rockauto and they said they have been selling APWI O2 brand for the past year and had no problems.


    Thanks.

  12. #11
    jupiter57 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    May be a "stupid" question, but are you clearing the codes after replacing the O2 sensors?

    IIRC, once a code is set, it stays in memory until cleared. (That used to be the case, I haven't thrown a code in several years!)

    It's worth a try.

  13. #12
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    Yes, I have a code reader / scanner where it can read live data and clear the codes.


    I just not sure what to do now.

  14. #13
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 2001 Catera throttle body and O2 sensors

    Any other tips what I should do to figure out these rear O2 CELs, should I buy another sensor?


    Thanks.

  15. #14
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    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 2001 Catera throttle body and O2 sensors

    these cars are definitely not happy with many aftermarket O2 sensor brands ... bosch sounds like it might have been the OEM supplier but i can't remember

    stick with the ACDelco part if you can
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  16. #15
    marko69 is offline Cadillac Owners Member
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    Re: 2001 Catera throttle body and O2 sensors

    Just to clarify, on the sensor with the 161, with the old sensor, new sensor and the sensor from the other side on the connector, you are always getting code 161? What percent or voltage does your scanner read for the sensors. Is the new sensor a direct fit or universal?

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