355 - OBD2: P1445, P0153, PO159 P1448, P0410 | FerrariChat
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355 OBD2: P1445, P0153, PO159 P1448, P0410

Discussion in '348/355' started by Uberpower, Apr 15, 2023.

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  1. Uberpower

    Uberpower Formula 3
    Rossa Subscribed

    Feb 6, 2004
    1,115
    #1 Uberpower, Apr 15, 2023
    First and foremost: the HyperTough HT300 OBD2 scan tool works with the F355 OBD2 port so long as you have had the recall done (which apparently mine did.). It was less than $40. I also ordered some Bluetooth ones but wanted to try and use one of my few free days to diagnose my CEL a bit. The car runs great but the light was making me nervous.

    It threw these codes: P1445, P0153, P0159 P1448, P0410. I am not a mechanic, and I’m a good hour+ from a dealer.

    Here are the pics of the HT300 in action, any help regarding the codes and or parts from the 355 part thread that are less expensive than going to the dealer would be super appreciated.

    Thanks!

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  2. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,273
    Sydney
    Full Name:
    Ian Riddell
    #2 Qavion, Apr 15, 2023
    P1445 "Catalyst Temperature" (RH bank):
    Range/performance (plausibility/minimum/maximum)
    Check wiring
    Check thermocouple ECU
    Check thermocouple

    P1448 "Catalyst Bypass Circuit".
    Malfunction (signal minimum or maximum)
    Check wiring
    Check the valve
    Check vacuum leakage
    Check operation (of flap?)

    Please remind us again what you have had done to the car (and what you have already done to diagnose the issue), so we can start afresh.

    I don't think I've seen so many problem before :eek: The two above may or may not be caused by the Thermocouple ECU plugs being accidentally swapped over. Check wiring (routing) to thermocouple to confirm what each Thermocouple ECU behind the RH wheel well is connected to, then check the wire colours on the Thermocoule ECU plugs. If you can't see the colours clearly, you'll have to carry out continuity checks between the Thermocouple ECUs and the Motronic ECU.

    5.2 F1 Engine Management Wiring Diagram here:

    https://www.dropbox.com/t/xtReLY5JtFYbQSny

    Regarding the other stuff, maybe you have a vacuum leak or secondary valve or check valve issue?
     
    WATSON likes this.
  3. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,554
    San Carlos, CA
    Full Name:
    Mitchell Le
    #3 yelcab, Apr 16, 2023
    Some history would help.
     
  4. Targatime

    Targatime Formula 3

    Feb 22, 2014
    1,449
    Los Angeles
    #4 Targatime, Apr 16, 2023
    Seriously. A little more than "here are some codes" is needed here. Obvious stuff.
     

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