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Check Engine - Code P2096
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Thread: Check Engine - Code P2096

  1. #1
    Lifetime Member Tramonto's Avatar
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    Check Engine - Code P2096

    I have a 2015 Fiat 500L with Automatic and 31,000 miles. My check engine light came on so I ran a diagnostic test and only 1 code showed. P2096 Control Unit 10 Catalytic converter Fuel Trim bank 1 to lean. So I tested the system and got 3 systems that did not pass. CAT EVA 025. I am guessing that if an O2 or the cat itself were bad all three of those would show up. Am I correct that the 02 which needs to be check is the one which is in line with the firing of cyl. 1. If that is correct where is the 02 sensor located. If not then which one do I need to check. Is there a way to determine if a sensor is bad? Any brand I should buy or stay away from and about how much do they cost? The car seems to be running fine. No lag, hesitation, backfiring or lose of gas mileage. Thanks In advance for help and advice.
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    Senior Member fast_dave's Avatar
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    Quote Originally Posted by Tramonto View Post
    The car seems to be running fine. No lag, hesitation, backfiring or lose of gas mileage. Thanks In advance for help and advice.

    Just sayin' - start simple and $0.00

    Have you tried clearing the code(s) and carrying on as normal or?

    Additionally, if you clear the codes, and the codes come back (BUT the car is STILL running normally), I'd then go so far as to clear the codes (again) and then disconnect the battery overnight so as to erase ALL OF THE LEARNED ECU PARAMETERS.

    That way when you re-connect the battery cables the next morning, you'll be starting with ONLY the FACTORY FRESH ECU PARAMETERS.

    Hope that helps -


    When you re-connect your cables the next morning, you'll be starting with
    2012 Sport 5 speed Manual Trans, SPC Adjustable Front Camber Bolts, CorsaStrada Lower Front Chassis Brace, ST Rear Sway Bar, 205/45/16 Bridgestone Potenza RE760 Sport Tires

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    Quote Originally Posted by Tramonto View Post
    1/ 1 code showed. P2096 Control Unit 10 Catalytic converter Fuel Trim bank 1 too lean.

    2/ The car seems to be running fine. No lag, hesitation, backfiring or lose of gas mileage. Thanks In advance for help and advice.
    First off, our lil' Fiats are inline engines, as opposed to "V" engines. There is no Bank 1, or Bank 2, even thought the code reader describes it like that. Your car has 1 Cat Upstream O2 sensor, and 1 Cat Downstream O2 sensor.

    Secondly, if the car is running great, that eliminates most things. The siginal from the upstream O2 sensor is what the ECM uses to set the air/ fuel ratio, among other things.

    That leaves two things, the Cat itself, and the downstream O2 sensor. The downstream sensor will report to the ECM how the Cat is performing. The Cat could be good or bad, or the sensor could be faulty and telling the ECM that the Cat is bad, when it really isnt.

    The downstream sensor is $33 at Rock Auto.....Pretty cheap...... I'd start there.

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    Did you fix it, yet? This is a good thread.

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    Lifetime Member Tramonto's Avatar
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    No I have not been able to resolve. I tried fast Dave idea hoping it would work and it did not. I am taking it into the shop next week. If the cat has gone bad I am thinking of having it removed. They are dropping smog testing here at the end of this year. Also seems like that would be a great spot to put an exhaust cutout.
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    8254FD5B-F054-47AC-BF5A-3188F40596B0.jpg
    i am trying to get the bottom O2 sensor out. I can’t figure out how to disconnect the wire. I pushed up on the yellow tab thinking it would then come apart. I see it moving (looks like three parts) but will not come apart. What am I doing wrong?
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    Lifetime Member Tramonto's Avatar
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    Well I finally got the little bugger. Have to press down on the tab real hard. But just had to put it back in. No one has the down stream sensor in stock. I check it further and found out it has low power on it. So I am hoping that it is just that sensor. Dealer wants $125 for the part, I asked him want brand did Fiat use, he did not know. None of the part stores had one in stock. They can order the Denzo. Was not able to tell what the brand the OEM is. Does it matter as long as it meets specs.
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    2015 500L Lounge edition

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    Quote Originally Posted by Tramonto View Post
    Well I finally got the little bugger. Have to press down on the tab real hard. But just had to put it back in. No one has the down stream sensor in stock. I check it further and found out it has low power on it. So I am hoping that it is just that sensor. Dealer wants $125 for the part, I asked him want brand did Fiat use, he did not know. None of the part stores had one in stock. They can order the Denzo. Was not able to tell what the brand the OEM is. Does it matter as long as it meets specs.
    @Tramoto

    Alisobob hasn't replied, you're in a bind, so I'll jump in on his behalf

    The OEM 02 Sensor is not necessary - aftermarket will do just fine

    Rock Auto has the DENSO downstream 02 sensor in stock.

    You're looking at approximately $40 for a Denso #234478

    A brick and mortar auto parts store will be twice the price,
    so if I were you I'd just reconnect the wiring harness and order the 02 sensor from Rock Auto.

    Denso is a "good to go" brand - FD Approved

    Rock Auto Link to your sensor >>> http://www.rockauto.com/en/catalog/f...2)+sensor,5132

    Hope that helps and I've added their latest 5% Off discount code below the picture of the 02 Sensor

    234-4748_SID__ra_p.jpg


    Here's a 5% off Rock Auto Discount Code
    5% Discount Code: 73241317B4CAE7
    Expires: October 19, 2021


    Please enter this code in the ‘How Did You Hear About Us’ box to receive the discount.
    Please enter ONLY the discount code, no other words or numbers.
    All orders are placed online and the discount code must be entered before an order is submitted to receive the discount.
    Last edited by fast_dave; Today at 01:18 PM.
    2012 Sport 5 speed Manual Trans, SPC Adjustable Front Camber Bolts, CorsaStrada Lower Front Chassis Brace, ST Rear Sway Bar, 205/45/16 Bridgestone Potenza RE760 Sport Tires

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