P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) - Alfa Romeo Forum
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Old 08-06-08
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P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

When i get for first time this error code and the message "MOTOR CONTROL ENGINE FAILURE" the fisrt think i did was to change the lambda sensor. After one day the error came up again.
So i did this test.
The lambda sensor has 4 wires Black-grey is to get the information from the oxygen . The two white wires is the heater. I connect these white wires to a battery 12volt and the lambda came up hot very quicly. But With the old one lambda i almost get burn the wires. That means that the sensor is short-circuit and i 'm sure that a fuse is blown up in my car so the new sensor cant heated. Does the o2 sensors having fuses? And where are? Maybe a relay is off?
My car is Gt 1.8
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Old 09-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

i think the lambda sensor shares the injection system fuse in the engine bay.

have you checked if there is a 12v signal on the connector?
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Old 09-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

No i didn't. Should be having all the time 12volt there?(white-white) as the engine is running?
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Old 12-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

nobody else knows something more?
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Old 13-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by jimtas View Post
No i didn't. Should be having all the time 12volt there?(white-white) as the engine is running?
one of the white should have 12v with engine running.

check all fuses in engine bay fusebox.
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Old 14-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

I have check all the fuses.. And some relays. They are all good. I think that the 12 volt signal for heating the sensor is coming straight from the ecu. I m afraid that the ecu is having the problem.
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Old 16-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

So is the heater circuit always on or controlled by input from other temp sensors ? Sounds like the ECU controls this heating so assuming yes ?

C
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Old 16-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

lambda heater should be on at all times. this is done to firstly get it up to temp quickly and then to keep it there even when exhaust is running colder (idling for example).
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Old 17-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

maybe a water temperature sensor is off?
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Old 17-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

every time i reset the problem with my obdII checker the "MOTOR CONTROL ENGINE SYSTEM FAILURE" appears after 30-70 klm.
I believe that the lambda does not always be heating. When the ecu can;t get any milivolts from it then the ecu is trying to heat the sensor,to start working.That happens when the car get start in the morning when its completely cold. But the problem doesnt appear.
It appears after 20-30 klm or more sometimes. after 7-10 starts.
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Old 18-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

This is exactly what is happening to me, always 3-6 miles into a cold journey the light comes on. Alfa replaced the lamba under warrantee and on it came a few days later, so its clearly not the sensor.

Likewise it is intermittent as after a few starts it can go off for a while. Its also much less frequent since April where the weather is better. I seemed to suffer most when < 5 oC.

As it has never affected my performance and the light and codes indicate out of bounds errs on the sensor bank I has just lived with it.

The answer is something I nor this site has been able to answer is what makes this happen. If the heater circuit is ALWAYS on and not controlled via any other inputs to the ECU then it seems to suggest pure wiring/connection expansion ?????

C


There's nothing in the dark that isn't there in the light ..... except fear
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Old 18-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

they must have replaced the wrong lambda (not unusual for a dealer tbh)
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Old 18-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

If the wires are burning on the old sensor as you connect it directly to the battery, I fear that you may have damaged the wiring before the plug or even the internals of the ECU.
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Old 18-06-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by Smaky View Post
If the wires are burning on the old sensor as you connect it directly to the battery, I fear that you may have damaged the wiring before the plug or even the internals of the ECU.
that's exactly i mean... something has burned inside there but noone can find it. I went to 3 mechanics and all of them told me live our car hear and we will see. The problem is i have no time to do this. I think a water sensor is off. that sensor is not protected by a fuse.
i did not connect any volt direct to the new lambda sensor or my car i have bought 2 lambda. i did the test with the first one.
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

You can do a continuity check of the lamda to see if it's shorting.
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Old 06-07-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

The volts between 3-4 connector (lambda connector) is 7,8 v. Thats the problem. I check the wires from the ecu until the connector and its ok with a ohm meter. Is the any possibillity the ecu having the problem?
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Old 28-08-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Have you found a solution to the problem?
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by charlie8 View Post
So is the heater circuit always on or controlled by input from other temp sensors ? Sounds like the ECU controls this heating so assuming yes ?

C
The ecu sends a signal to the relay to send power to the heater whilst the ignition is on, this way the heater in the sensor is always on, the probe in question here is the one on the left as you look at the downpipe from the front of the car. Either the relay is faulty or the probe has died. Swap the 2 probes over in the exhaust and see if the fault moves, this will prove it's the probe if it does.
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Old 20-10-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by kkkrisss View Post
Have you found a solution to the problem?
Well i m coming back after a long time..
I did some tests with a voltmeter and a ohm meter. at the lambda cables
the 2 front lambdas and the back.
when the engine get start the 2 white cables having 12 volt signal to get warm the heater. after a few seconds the exhaust get hot and the ecu stops the signal at the 2 front lambdas.
the question here is ..
how the ecu undertand that the excaust is hot? from the signal that is coming back from the grey and black wires? (counts the oxigen?)or from the resistants of heater? as hot it is so the resistants gets higher.
so i did the same think and at the back
i connect the voltmeter at 2 white cables and i drive the car for 10 km.
all the excaust should be hot after this. but the ecu is still giving 12 signal at the heater!!! why is that?
maybe the ecu see from the oxigen sensor signal much co2? and thinks that the back catalisator is still cold? and not working properly?
why then doesn't give the message
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) or
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) or
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) ?
and gives always
the
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
my catalyst is a 200 cpi..
and i have remove the prokatalist..
i think that the ecu get stuck and give always signal the heater as much resistans the heater has.


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Old 20-10-08
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by jimtas View Post
Well i m coming back after a long time..
I did some tests with a voltmeter and a ohm meter. at the lambda cables
the 2 front lambdas and the back.
when the engine get start the 2 white cables having 12 volt signal to get warm the heater. after a few seconds the exhaust get hot and the ecu stops the signal at the 2 front lambdas.
the question here is ..
how the ecu undertand that the excaust is hot? from the signal that is coming back from the grey and black wires? (counts the oxigen?)or from the resistants of heater? as hot it is so the resistants gets higher.
so i did the same think and at the back
i connect the voltmeter at 2 white cables and i drive the car for 10 km.
all the excaust should be hot after this. but the ecu is still giving 12 signal at the heater!!! why is that?
maybe the ecu see from the oxigen sensor signal much co2? and thinks that the back catalisator is still cold? and not working properly?
why then doesn't give the message
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) or
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) or
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) ?
and gives always
the
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
my catalyst is a 200 cpi..
and i have remove the prokatalist..
i think that the ecu get stuck and give always signal the heater as much resistans the heater has.
So the catalyst may be the actual problem coz the rear sensor is actually a diagnostic sensor. If there is something wrong with the cat the ecu will know by the readings of the sensor.
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Old 11-01-09
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

i put back the precat and the problem is still remaing...
i still havent found any solution to my problem so the only thing that might have fault is the ecu.
i m ready to replace it. my mechanic wants 750 euros to replace it
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Old 12-01-09
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by jimtas View Post
i put back the precat and the problem is still remaing...
i still havent found any solution to my problem so the only thing that might have fault is the ecu.
i m ready to replace it. my mechanic wants 750 euros to replace it
You are using OE lamda sensors right? I had a similar problem because I was using some universal lambda sensors. The heater resistance was different and the ECU was getting MCSF. Before you change your ECU you can try new BOSCH lambda sensors with original specifications.
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Old 12-01-09
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Here's what fixed my similar issue. The lamdba wire was touching the manifold - it had escaped from the loom clip. Once I sre-eated it away from the exhaust I have had no more probs for 9 months.

I think the signal must be so weak in the cable that the resistance in the wire confuses the signal ?

Can't 'really' explain it but it cured me and instantly, 5 starts later.

C
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Old 13-01-09
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

All the wires have been checked several times....with ohm meter they are all good.The lambda sensor are new and bought from the alfa romeo
.I had the old in my hands when i get the new one.
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Old 14-01-09
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Re: P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Originally Posted by jimtas View Post
All the wires have been checked several times....with ohm meter they are all good.The lambda sensor are new and bought from the alfa romeo
.I had the old in my hands when i get the new one.
What about the other lambdas? Did you change them all? You are sure they gave you the correct sensor? Coz i did not buy my universal sensors by myself they sold them to me as proper replacements.
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