My CEL came on today and I pulled the codes and got: P0160----02 sensor ckt no activity (bank 2 sensor 2) P0154----02 sensor ckt no activity (bank 2 sensor 1) p1448--- manufacturer control auxiliary emission controls p0134--- 02 sensor ckt no activity bank1 sensor 1 p1121 manufacturer control--- fuel air metering p1445-- manufacturer control auxiliar emission control p1115-- manufacturer control fuel air metering How could all of these come up at once, did something unplug or what kind of problem does this sound like? The only mod are/is aftermarket caps (I think hyperflows but not certain) Has anyone had experience with any of these codes? If so ANY help is greatly appreciated, thanks in advance.
Not sure as I just purchased the vehicle (cats were already on there and im sure the prev owner knew about this but just cleared them long enough for it to be someone elses problem)
Don't fret my friend..... we are here for you ...... I had five codes at one time, I troubleshot them, fixed them and have been code free ever since . Here is my chronicle from back in the day.... !! gothspeed....cats,codes & CEL.... !
Some 1996 and later 355 owners disconnect all of their O2 sensors (not recommended, by the way) because their systems have trouble with aftermarket cats. You've got to be careful that your previous owner didn't have a real problem with the O2 circuits such that they were overheating cats...or worse, that the timing belts weren't properly set after an engine service (prompting some cheapskate somewhere down the line to simply disconnect the O2 sensors). ...But yes, it looks like all 4 of your O2 sensors are unplugged. Plug them back in. Clear your error codes, and pay special attention to your cats for overheating. A cheap laser thermometer will help. Also, check to see if a prior owner disabled/disconnected your SLOW DOWN LIGHTS. This could become a very hazardous situation! To check, turn your ignition key to Position II (Run, not the Start position but the Run position). Do you see your CEL and SLOW DOWN LIGHTS come on briefly? Welcome to Ferrari ownership. Sadly, you may be learning firsthand that some prior Ferrari owners bought far more car than they could afford to keep up.
Well I can see all 4 02 sensors plugged in(if you meant they werent physically plugged in) and it appears they are plugged in on those little green ECUs (thats the other thing, someone told me those little boxes look like they are out of a 95' and I have a 96' if that could be causing the problem) The slowdown light does work but does not come on or anything, its just a check engine light with the codes. So the timing belts not being properly set would cause the 02 circuit not to be working corrrectly???
I noticed I have a lot of the same codes as you (1448, 1445, 1115) You mention something about a vescovini ecu? Is that the same as the catalyst ecu or where is that located? Also, I am getting 1448 so does that mean my bypass needs to be lubed like yours or was one thing causing ALL your codes?
Are your temperatures ok?? water 190F oil 210F? I think Yes, because my car was not driven, the bypass valve soleniond was sticking. I used WD-40 and a 12v battery to "excersise" it. Next my thermal switch on top of the LH radiator was bad, causing a code. I replaced lots of vacuum lines. I also disconnected cleaned and used anti-corrosion "connector lube" on every connector I could reach. Make sure your radiator fluid reservoire cap are installed tight, along with your gas cap. These also cause codes.
OK. Good to know that all 4 O2 sensors are plugged in! Sorry, I'm probably not communicating very well. You should have TWO "slow down" lights and at least one (early 355's may have had two) separate Check Engine Light. I'm just going over some basics to be safe. When you first go to your 355 in the morning and turn the key to the Run position prior to starting the car, you should see a SLOW DOWN 5-8 light on the top left of your dash and a SLOW DOWN 1-4 on the top right of your dash. They should both flash on and turn off fairly quickly as the SLOW DOWN ecus do their self tests. Ditto for your Check Engine Light (CEL). However, some unscrupulous prior owners have been known to remove the lights behind those SLOW DOWN panels to fool prospective buyers into thinking that there's not a problem. So I just wanted you to verify that all three lights illuminate before you start your car (just in case).
ok here goes..... I did not take any pics because I was too lazy.... hopefully tomorrow.... but here are the code defs: P1448 = catalyst bypass flap circuit....... check wiring, check the valve, check vacuum leakage P0160 = o2 sensor downstream catalyst (bank 2, sensor 2).... check the wiring, check the signal (0.97-1.05), check injector and wiring, check engine co hc emmision base..... HC<250ppm CO <1.1% P0134 = o2 sensor upstream catalyst (bank , sensor 1)... check the wiring, check the signal (0.97-1.05), check injector and wiring, check engine co hc emmision base..... HC<250ppm CO <1.1% P1115 = o2 sensor heater circuit upstream catalyst (bank , sensor 1)... check the wiring, check o2 sensor impedance continuity and value, check in diagnosis mode heating o2 (I don't know how to do that last one). P1121 = o2 sensor heater circuit downstream catalyst (bank 2, sensor 2).... check the wiring, check o2 sensor impedance continuity and value, check in diagnosis mode heating o2 (I don't know how to do that last one). P1445 = catalyst temperature vescovini... Range/Performance (plaus???,min,max), check the wiring, check vescovini ECU functionality, check thermocouple functionality. Hope this helps..................
Thanks a million goth!!! I managed to take some pics of my vescovinis/that plug I told you about so whenever you want me to email them let me know.
I tried a few minutes ago but am having issues with my software and will probably have to wait until the weekend if thats ok. If you get around to taking pics of your cat ecus and plugs please post them up, thx.
Ok I hopefully these pics work, they are pics of the right and left side cat ecus (the right side one you can see that plug that is just hanging/going to nothing, that plug is coming from the bypass valve and I need to know where it goes) Please let me know what your guys' look like. This is on a 96' but I think the prev owner put the cat ecus from a 95' for some reason. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
From what I can tell..... the connectors "just hanging" are the thermocouple plugs that should be in the ECU. The reason I say that is... they have the metal braid on them. I don't know what the ones plugged into the ECU are from. For reference the thermocouple plugs have two wires, the ECU plugs have three How many of the metal braid connectors do you see hanging?
I only have the one in the picture with the metal braids that is not hooked up, but there is nowhere in the ecu to connect it to. Does your ecu have 3 plugs then?
No, my cat ECUs have two plugs. I meant the number of wires going to each of those two plugs. The thermocouples (braided) should be plugged into the cat ECUs. I dont know what those other ones are. Follow the wires and see where each of the the "two" wire connectors go.
I could unplug the bottom plug and then plug that hanging one with the braided wire (the one that goes right by the bypass valve) in, but then where would the one that is plugged in the bottom go?
LOL....... I think you may be onto something..... .... the connectors are way different but maybe someone spliced two wire o2s in there..... that would be awefull.... !!
Dont worry about the bypass right now..... just find the LH and RH thermocouples and plug them into the LH and RH cat ecus!! How many thermocouples do you have??
Those are plugged into the cat ecus, on the bottom plugs, but then there is nowhere for that plug to go with the braided lines, is that one supposed to get plugged into the cat ecu instead?
Ok I went home to check everything. The LH and RH thermocouples are plugged into the bottom of the cat ecus like they should be on each side. The 02 sensors are plugged into their correct plugs. The only problem I think I have is I cannot find where the thermocouple plug from the bypass valve gets plugged into, where does that plug get plugged into? Thats the one thats hanging, if I can find where that one gets plugged into I think itll alleviate my probs.
