P0153 - HO2S Slow Response Bank 2 Sensor 1
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Northstar Engines and System Technical Discussion Discussion, P0153 - HO2S Slow Response Bank 2 Sensor 1 in Cadillac Engine Technical Discussion; Have a 1998 Deville, with 78K miles, at 60K, I had encountered the PO153 code (HO2S Slow Response Bank 2 ...
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    dukester is offline Cadillac Owners Member
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    P0153 - HO2S Slow Response Bank 2 Sensor 1

    Have a 1998 Deville, with 78K miles, at 60K, I had encountered the PO153 code (HO2S Slow Response Bank 2 Sensor 1) had the bank 2 sensor 1 02 sensor replaced with a Bosche.

    Then at 70K, another PO153, this time I replaced the same Bank 2 sensor 1 (Bosche).

    At 77K, another PO153, cleared the code, then at 77.3, PO153, cleared the code, then at 78K, PO153.

    Any advice here?

    In advance, thanks . ..

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    dukester is offline Cadillac Owners Member
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    Need to add, I had a bad Fuel Pressure Regulator (Great diagnosis from Ranger - many thanks), which was leaking gas into the intake vacuum.

    I just replaced it 100 miles ago, and removed the pos bat for 2 hours, to allow the computer to reset the fuel settings.

    I am wondering if the leaky FPR was causing problems on my 02 sensor?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    By your statement, the FPR may have been your problem all along. O2 sensors react to rich and lean mixtures, so a rich condition caused by a raw fuel leak would surely mess up the air/fuel ratios and therefore the "expected" values set into the O2 sensor specs.

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    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    Your problem might be Bosche. I would have recommended you stick with A/C Delco.

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    dukester is offline Cadillac Owners Member
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    Ranger, why do you recommend AC/Delco over Bosche?

    I was told the Bosche was OEM replacement . . .

    And why do think it might be the BOsche?

    THX!

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    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    Many forum members have reported bad results with Bosche stuff.
    Don't mess with Binky Bear!


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    Submariner409's Avatar
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    (Robert) Bosch equipment is "OEM style". Original is Delphi or ACDelco. BUT, what company actually made the sensor is the mystery........

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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    From what I've heard, most Bosche part do not play well with Northstars.

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    ewill3rd is offline Cadillac Technician
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    Re: P0153 - HO2S Slow Response Bank 2 Sensor 1

    The Bosch sensors are made for multiple applications, while in theory they should work the same no matter what they are in, who knows?
    I have seen a lot of Bosch replacements fail, N*'s do not like Bosch plugs for sure.

    That code should be an actual sensor malfunction, a specific set of conditions need to be met for that code to set.
    The only really important thing to remember is that Bank 2 is the front bank on a N*.
    Some people think it is the rear one.

    I don't see a lot of Delco part failures on O2 sensors, seems like buying one factory one would be cheaper than buying 3 Bosch parts.

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