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Old 20-11-2019   #31
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Re: Poor performance

Good that you cleared down the old codes. They could be issues caused by transient issues that are no longer happening or relevant.

The codes you have mean;

P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0571 - Cruise Control/Brake Switch A Circuit Malfunction
U1600 - Fiat specific (igniton key recognition problems)

Of these, I'd say the one to worry about is the P0141. It looks like a duff lambda sensor (or an issue in its heater circuit). Check the relay to make sure it's getting power... otherwise a new lambda might be needed.

The Cruise Control/Brake switch malfunction ... check the brake lights circuit and the switch down by the pedal. I presume you don't have C/C.. so this one might go away of you find/sort out a brake circuit electrical problem.

U1600 is what the car does when you use an unknown key. If your key is on a key ring with a dozen other car keys, it might be picking up a random signal. Isolate the ignition key (remove it from that keyring) and put it in the ignition with no other keys anywhere near it. That should resolve this code (although you'll need to clear the code to see).


Ralf S.
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Old 21-11-2019   #32
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Quote Originally Posted by Ralf S. View Post
Good that you cleared down the old codes. They could be issues caused by transient issues that are no longer happening or relevant.

The codes you have mean;



P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0571 - Cruise Control/Brake Switch A Circuit Malfunction
U1600 - Fiat specific (igniton key recognition problems)

Of these, I'd say the one to worry about is the P0141. It looks like a duff lambda sensor (or an issue in its heater circuit). Check the relay to make sure it's getting power... otherwise a new lambda might be needed.

The Cruise Control/Brake switch malfunction ... check the brake lights circuit and the switch down by the pedal. I presume you don't have C/C.. so this one might go away of you find/sort out a brake circuit electrical problem.

U1600 is what the car does when you use an unknown key. If your key is on a key ring with a dozen other car keys, it might be picking up a random signal. Isolate the ignition key (remove it from that keyring) and put it in the ignition with no other keys anywhere near it. That should resolve this code (although you'll need to clear the code to see).


Ralf S.
Thanks ralf for your reply

Getting somewhere lol.

Yes my brake lights don't work.
I drive with my parks on so I'm not pulled over unnecessarily by cops😂

Any way, where is the relay located?Will check that out because I am killing myself looking for either lambda sensor(pre and post cat)
No parts store has it here. I want to change both just to have peace of mind.

Car is moving better and speedometer not jumping like I said before.
Still has that uneven acceleration slightly so now diagnostics helped me nail it down to O2.

Seems Like I would need to import a sensor from EBay.

In terms of key,its only the car key and a key ring. The car is locked and unlocked with the key itself and Fob doesn't work. Although battery changed and small light goes on when you press a button on the fob. It was standing awhile by delear before I bought the car.

Again thank you for the awesome help.

Getting somewhere.
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Old 21-11-2019   #33
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Quote Originally Posted by Ralf S. View Post
Good that you cleared down the old codes. They could be issues caused by transient issues that are no longer happening or relevant.

The codes you have mean;

P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0571 - Cruise Control/Brake Switch A Circuit Malfunction
U1600 - Fiat specific (igniton key recognition problems)

Of these, I'd say the one to worry about is the P0141. It looks like a duff lambda sensor (or an issue in its heater circuit). Check the relay to make sure it's getting power... otherwise a new lambda might be needed.

The Cruise Control/Brake switch malfunction ... check the brake lights circuit and the switch down by the pedal. I presume you don't have C/C.. so this one might go away of you find/sort out a brake circuit electrical problem.

U1600 is what the car does when you use an unknown key. If your key is on a key ring with a dozen other car keys, it might be picking up a random signal. Isolate the ignition key (remove it from that keyring) and put it in the ignition with no other keys anywhere near it. That should resolve this code (although you'll need to clear the code to see).


Ralf S.
I removed the sensors once to clean them and the one sensor(furthest to tail pipe)was completely black and covered in carbon.
The other was still looking okay
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Old 22-11-2019   #34
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Re: Poor performance

Quote Originally Posted by NebulaStilo View Post

Yes my brake lights don't work.
I drive with my parks on so I'm not pulled over unnecessarily by cops😂
The P0571 error could be spot-on correct and it's the brake light switch.

This is on the top of the brake pedal and usually looks like a simple plunger switch. When you press the brake pedal it moves the plunger (in or out) and that completes the brake lights circuit.

Take it off and see whether you can make a circuit by connecting the two electrical leads together (stick a bulb across them and see if it lights up with the ignition on). If it does, then it's the switch that's knackered.


Ralf S.
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Old 22-11-2019   #35
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Re: Poor performance

Quote Originally Posted by NebulaStilo View Post

Any way, where is the relay located?Will check that out because I am killing myself looking for either lambda sensor(pre and post cat)
There are relays on the fuse boards under the dashboard and also on top of the battery. The lambda relay is most likely one of those red ones on top of the battery but I have no idea which one it is (no Manual with me).

If you don't know which is which, take a photo of the fuse board then remove the relays, one by one or a few at a time. Be careful not to pull the caps off, if they're tight. Lever the relays up with a small screwdriver rather than trying to pull them.

Clean up the connector blades with some emery paper and use a small wire brush or paper-clip etc. to scrape any gunge out of the female connector that is in the fuse board.

Then replace the relays in a like for like position. When they're out you'll be able to see that there's about 2 or 3 different types. Replace each relay in a different location (but obviously one that uses the same type of relay) so that any issue with the relay itself will show up as a fault on some more "visible" item, like all of a sudden if your horn no longer works.

If shuffling the relays about doesn't cause a new problem to appear somewhere else (but your lambda heater starts working/the error clears and doesn't come back) then the relays are okay. Relays don't usually fail compared to the connections get corroded, so just cleaning them will help.

If the relays doesn't solve the problem it could be just a regular old lambda failure. They do pack up occasionally. The first one is more likely to be the problem since it works harder and gets hotter gas on it.. (and teh error message hints that it's the No.1 which has the fault).

But you can clear the error, swap the sensors round (if they're the same size) and see if the error comes back or moves to be No.2... in which case you'll know it's this sensor that's the problem.


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Old 22-11-2019   #36
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Re: Poor performance

Quote Originally Posted by NebulaStilo View Post
In terms of key,its only the car key and a key ring. The car is locked and unlocked with the key itself and Fob doesn't work. Although battery changed and small light goes on when you press a button on the fob. It was standing awhile by delear before I bought the car.
Getting somewhere.
The U1600 problem is most likely something in the c/locking circuit then.

There are c/locking relays on the Body Control Module under the dashboard (behind the fuesbox) so it could be an issue in there or with the (PCB) circuits.

If the car starts and works okay apart from this error, it's probably not the biggest problem right now, unless someone has a BCM wiring diagram and can tell you which pins to test. I don't have access to some of the more detailed official Fiat diagnostics stuff, I'm afraid.


Ralf S.
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Old 26-11-2019   #37
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Quote Originally Posted by Ralf S. View Post
The U1600 problem is most likely something in the c/locking circuit then.

There are c/locking relays on the Body Control Module under the dashboard (behind the fuesbox) so it could be an issue in there or with the (PCB) circuits.

If the car starts and works okay apart from this error, it's probably not the biggest problem right now, unless someone has a BCM wiring diagram and can tell you which pins to test. I don't have access to some of the more detailed official Fiat diagnostics stuff, I'm afraid.


Ralf S.
Hi

I'll try that relay testing you said. I'll also try swop the sensors around. They look different from each other.

The car starts perfect and has no problem locking with key. But doesnt lock with buttons.

Sometimes it doesn't lock on its own when driving. (Its suppose to lock when going over 20kmh ) sometimes it doesn't lock. But when leaving the car say at a mall then i can lock her with the key.
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Old 2 Weeks Ago   #38
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Quote Originally Posted by NebulaStilo View Post
Hi Ralf.
I changed crank sensor just as another idea.
Going to get diagnostics but just wondering,
My stilo won't rev passed 6000. Is that normal. I was idling and revved the car till red but when it reached 6000 it made like a Honda vtec sound and stucked at 6k
HI guys, did you manage to find the problem? I have the same simtoms, not reving past 6000, poor performance overall, and the same metalic sound Nebula had in his video. No engine errors whatsoever. I changed the plugs, battery, waterpump, belts... Still the same

Thanks everyone for the support!!
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Old 1 Week Ago   #39
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Re: Poor performance

Clean the carterventilation or check/replace the airfilter.
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Old 5 Days Ago   #40
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Re: Poor performance

Quote Originally Posted by Moreno83 View Post
Clean the carterventilation or check/replace the airfilter.
Carterventilation? can you give me more details please?

Thanks for the reply :P

BR,
Ovi
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Old 1 Day Ago   #41
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Re: Poor performance

There is a rubber hose going from your air intake/Throttlebody down to your engine. The rubber hose is below the oilcap on the 1.6. Remove it and see if there is a any "mayo" in there.
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