Whole slew of o2 sensor codes - Replaced Sensors Already | FerrariChat

Whole slew of o2 sensor codes - Replaced Sensors Already

Discussion in '348/355' started by RotarySwingGolf, Nov 17, 2012.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Ok, been away from the car for about 5 months. Came home to a plethora of codes that it wasn't throwing before I left for the summer. I've driven it and reset the codes and they're still popping up, so I need get her fixed.

    They're all tied to the O2 sensors and cat ecu I believe. I replaced the o2 sensors last year with the correct ones after finding the wrong and right part numbers here on the forum, so I don't believe that to be the issue. I also tried swapping the cat ecu's last year to test them and that didn't resolve another problem ( I was throwing one bad O2 sensor code last year, but not all these).

    Here are the codes:

    0159 - should be o2 on bank 2, sensor 2 - replaced
    0152 - "slow response on B2 S1
    1449 - driver cat thermocoupler I believe
    1445 - passenger cat thermo (these two lead me to believe its the ecu's, but I tried switching them last year with one of the other ecu's that is the same unit and not throwing any codes and it didn't change anything)
    1115 - o2 heater
    0134 - B1 S1 no activity on this sensor


    I have the slowdown and CEL lights pulled because I have the capristo bypass remote. Anyone seen something like this all popup together?
     
  2. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,038
    USA
    Clear the codes, AND leave the bypass valve operation "normal", do NOT use the Capristo remote control. I suspect many (but not all) of your O2 codes are related to leaving the bypass open. It WILL cause problems, as Ferrari of Seattle tried it with my Capristo muffler and saw the Motronic trying to richen and it threw both codes and slow down lights.
    Too little exhaust will pass the pre catalyst O2 sensors with the bypass constantly open, which really messes with the Motronic. The solution would be to move the pre catalyst O2 sensors to the collector on each exhaust manifold...just before where it "splits" to the catalyst and Y pipe.

    Drive it for a while and see what (if any) codes come back. Try to drive it this way for at least 50 to 100 miles.

    The "no activity" could be a bad connection.

    Be absolutely certain you have the correct O2 sensors, and mounted in the correct locations. 13819 pre catalyst, and 13820 post catalyst, and ensure they are connected to the proper connector. People have accidently swapped the connectors front to back...
     
  3. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Thanks f355Spider. I will clear and drive it with the valve operating normally. I don't leave it open very often, but did drive it about 10 miles with it open the other day and codes popped up right after that, so maybe that's it. I sort of remember experimenting with this last spring before I left for the summer and remember it may have cleared up all the codes except B1 S1. Hopefully this is it.

    I've triple checked the O2 sensor PN's, they are correct.
     
  4. Extreme

    Extreme F1 Rookie

    May 26, 2010
    2,515
    Northern Utah
    Full Name:
    Erick
    With the 5.2 motronic and the capristo 3 you cannot have the bypass valve open continuously. What happens to the best of my understanding is that with the capristo 3 you will get the majority of your exhaust gases going via the route of the bypass even at idle. This will cause your primary o2 sensors to read a lean mixture going through the main cats and increase fuel into the system. This will cause your 355 to run rich and trigger the slowdown light and the CEL... Ask me how I know... Yep done the same thing as you.

    I am now trouble shooting codes that will not go away, not sure if it has anything to do with running the car rich. These are the codes I still have after 950 miles of driving.
    P0153, P0133, P0139.
     
  5. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Ok, so I've done about 40 miles with the valve not locked open and that does seem to have been the problem with majority of codes, so thanks Extreme!

    However, I have two that won't go away and seem to be tied to each other:

    p1115 which is the O2 heater on Bank 1 sensor 1
    p0134 circuit no activity detected on Bank 1 Sensor 1

    I have a voltage meeter so I can check it, but don't where to "plug" it in. I'm assuming two of the connectors on the 02 sensor wire, but which ones? Or is there something else I need to do?

    Anyone think it might be this: http://ferrarichat.com/forum/showthread.php?t=389854
     
  6. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,462
    San Carlos, CA
    Full Name:
    Mitchell Le
    That means your sensor is dead. Replace it.

    The 2 black wires have 12V on them to heat the O2 sensor
    The black and grey wires have the differential signal on them from the sensor.

    The OBD2 computer is telling you that it does not sense 12V on the black wires and it does not see any changing activity on the pair of white/grey wires.
     
  7. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Man, I already replaced that dumb thing. I ordered another from Ricambi, hopefully I just got a bad one somehow.
     
  8. SoCal1

    SoCal1 F1 Veteran
    Owner Silver Subscribed

    Jun 14, 2011
    8,630
    SoCal LA/OC/New Mexico
    Full Name:
    Tim Dee
    make sure you have them plugged into the right place
     
  9. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Wouldn't I have two errors if I had them swapped? Either way I don't think that's the isseu
     
  10. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,038
    USA
    Maybe, but check to be certain. Also, it is possible that you have a bad connector...so check the "car side" of the plug, and make sure it all looks good. It is possible to have a bad pin or connector issue. If so, you can order new pins and connectors from Dave Helms at Scuderia Rampante.

    As I mentioned in my post #2, I kinda figured the bypass open was possibly the problem. As intoxicating as it sounds, the car won't run right with the valve constantly open. The solution would be to physically move the precat O2 sensors to before the exhaust "splits" at the Y to the cats and bypass. Probably at or just past the merge collector on the exhaust manifolds.
     
  11. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    I went ahead and order a new sensor through Ricambi since I'm assuming they would have the part numbers right for sure! Will swap it next week and hopefully it's something that simple as having gotten a bad sensor.
     
  12. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Ok, I ordered a new sensor from Daniel at Ricambi, installed it, no joy. Still getting p1115 and p0134.

    Clearly it's not the sensor itself, where to look next? If I get this figured out I'm code free!!
     
  13. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,462
    San Carlos, CA
    Full Name:
    Mitchell Le
    Then you need to figure out what signals are being sent to the ECU from the sensors.

    Check the signals at the sensor connector.Trace the signals back to the ECU connector (behind the passenger seat firewall). See if the signals are intact. It is best to look at it with an oscilloscope but a DVM in AC mode will do. You can also get an OBD2 scanner that allows you to look at the actual voltage that the ECU is reporting at the OBD2 scanner port.

    Somewhere between the O2 sensors and the ECU, the signals have broken. If the signals make it OK to the ECU board, then ... bad news, the ECU is bad.
     
  14. windsock

    windsock Formula 3
    Rossa Subscribed

    Nov 29, 2006
    1,142
    Check the fuses. You likely have a blown fuse for the heater circuits to the o2 sensors. Often this will also result in the air pump not working as well. If fuse is good pay carefull attention to the fusebox itself.
     
  15. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    I have an OBDii scanner, but the rest of what you're saying is gibberish to me lol! So, I can start with that. Someone else mentioned a fuse. Is that fuse in the footwell of the passenger side or under the hood, off hand?
     
  16. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    dammit, it's in the footwell. A literal pain in the neck for me to get to (I broke my neck last year in a mountain biking accident). I'll be back....
     
  17. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Ok, ummm, I literally don't have those fuses. They're not listed on the panel that tells the position of the o2 sensor fuses and several others that are in the workshop manual aren't listed or used in my car (98 355).
     
  18. Challenge

    Challenge Formula 3

    Sep 27, 2002
    2,006
    PA
    Full Name:
    Kevin
    #18 Challenge, Dec 5, 2012
    Last edited by a moderator: Sep 7, 2017
  19. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    #19 RotarySwingGolf, Dec 5, 2012
    Last edited by a moderator: Sep 7, 2017
  20. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    #20 RotarySwingGolf, Dec 5, 2012
    Last edited by a moderator: Sep 7, 2017
  21. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,613
    The Brickyard
    Full Name:
    The Bad Guy
    #21 ernie, Dec 5, 2012
    Last edited: Dec 5, 2012
    Things I would check:

    1) condition of the catalytic converters
    If they are bad going bad the second O2 sensor will throw a code that the exhaust is rich.

    2) coolant temperature sensors
    If the coolant temp sensors are not sending the proper readings to the ecu the car can run rich/lean.

    3) operating temperature if the engine.
    If the car is running too cool it will stay in the secondary fuel entrichment mapping, causing the car to continually run rich. This can happen because of a faulty thermostat that is opening too soon, and or stuck open..

    4) mass air flow sensor
    Make sure the resistance on the mass air flow sensor is withing spec. I don't know what it is for the 5.2 Motronic, but for my 348 they should be set at 383/ohms. Be sure to find out the correct resistance for your 355 before you check it. Less resistance (a low number) will richen up the fuel, and more resistance (a higher number) will lean out the fuel mixture.
     
  22. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,462
    San Carlos, CA
    Full Name:
    Mitchell Le
    #22 yelcab, Dec 5, 2012
    Last edited by a moderator: Sep 7, 2017
    Here are what the book says about those codes: 0134 and 1115

    Both sets of recommendations point to a low signal reading from bank 1 sensor 1. From the look of your OBD2 scanner, Bank1 sensor1 signal seems much lower than bank 2 signals.

    If I were you, I would check for bad wire bad connections related to that sensor.
    Image Unavailable, Please Login
    Image Unavailable, Please Login
     
  23. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    I've traced the connections back as far as I can see them until they disappear into the bowels of the engine and don't see anything obvious.

    Ernie, there are no cats and no other errors from any other O2 sensor. All temps are within spec and exhibit normal behavior and I don't know how to check the MAF.

    This is looking like it may have to take a trip to the dealer.
     
  24. RotarySwingGolf

    RotarySwingGolf Formula Junior

    Dec 24, 2011
    490
    Florida and Idaho
    Refusing to give up...

    I hooked up my multimeter to the o2 connectors on both sides and they both read -1.04 ma (whatever that means...).

    This leads me to believe that perhaps I'm not getting a good connection with the left side sensor since it seems the voltage is good from the car?
     
  25. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,462
    San Carlos, CA
    Full Name:
    Mitchell Le
    Use the V scale on the meter, while the egine is running. The O2 sensor is supposed to put out a voltage, not a current.

    So if the signals at the sensors are good and identical from left to right, and the ECU is reading a too small of a signal on one side then maybe there is a bad connection from the bad side sensor to the computer. There are several reasons for a bad connection:

    corrosion at the various connectors
    bad pins at the connector (the pins have lost their springiness)
    broken wires through one of the many bends the wires make
     

Share This Page