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Old 4 Weeks Ago   #1
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Lambda Sensor problem

On Mutliecuscan I am getting "Lambda sensor above catalyst failed" or similar. Is this the O2 sensor. If so I have recently replaced this.

The symptoms are that the engine will start stuttering after about a mile on an uphill section. Will start again then fail.

Any advice please.
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Last edited by Seamus2012; 4 Weeks Ago at 15:40.
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Old 4 Weeks Ago   #2
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Re: Lambda Sensor problem

Did you fit a cheap sensor?

If the sensor is ok. Then have you checked over the wiring?
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Old 3 Weeks Ago   #3
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Re: Lambda Sensor problem

Which car and which engine?

D
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Old 3 Weeks Ago   #4
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Re: Lambda Sensor problem

2002 Seicento 1.1, according to previous thread.

Am I right in thinking that the MPI has 2 lambda sensors - one pre cat and one post cat?
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Old 3 Weeks Ago   #5
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Re: Lambda Sensor problem

Quote Originally Posted by dac69er View Post
Did you fit a cheap sensor?

If the sensor is ok. Then have you checked over the wiring?
Yes, cheap sensor. Wiring looks ok. I have put the Multiscan on and it is showing "Open Loop", so presumably it is faulty or wiring fault. I did run ok initially

Not sure what other checks can be run on it.
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Old 3 Weeks Ago   #6
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Re: Lambda Sensor problem

Quote Originally Posted by rallycinq View Post
Which car and which engine?

D
Seicento 1100, year 2002
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Old 3 Weeks Ago   #7
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Re: Lambda Sensor problem

Yup, 2 sensors, has the OP changed the right one and are the colours correctly matched, see the 'Free Cinq' thread....lol

D
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Old 3 Weeks Ago   #8
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Re: Lambda Sensor problem

Quote Originally Posted by rallycinq View Post
Yup, 2 sensors, has the OP changed the right one and are the colours correctly matched, see the 'Free Cinq' thread....lol

D
I changed the one that is under the ally heat shield.

The sensor was prewired so assume that is correct.
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Re: Lambda Sensor problem

Quote Originally Posted by Seamus2012 View Post
I changed the one that is under the ally heat shield.

The sensor was prewired so assume that is correct.
never assume

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Old 1 Week Ago   #10
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Re: Lambda Sensor problem

My saga continues.

I have replaced the faulty sensor and M,ecuscanner is now showing voltages for it. However the engine management light is flashing when the engine is running. The scanner is not showing any errors to clear, so I don't know where to look now.

Any ideas please.
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Old 1 Week Ago   #11
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Re: Lambda Sensor problem

Check the timing hasn't jumped.

D
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Old 6 Days Ago   #12
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Re: Lambda Sensor problem

I have been going through it again today. Replaced the top O2 lambda. But still getting the same problem.

I had the EML flashing so ran the Phonic wheel in MES and the flashing has now stopped.

It will run until it gets hot, then it might stall at idle, or if driven it will stall under load. Need to wait then for around 30 secs before it will restart and then it will only be for a short while.

When running it smells rich, but it also sounds like fuel starvation which is contrary to the former.

I am enclosing some readings from MES to see if anything jumps at anyone.

Hope someone can help me get to the bottom of this.

Edit
Just looking at the readings, could it be the bottom lambda at fault.
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Last edited by Seamus2012; 6 Days Ago at 17:00.
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Old 4 Days Ago   #13
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Re: Lambda Sensor problem

Anyone any ideas on this please.

I have just tried running with the bottom one disconnected and then the top also. Both presented the same symptoms. Can't make up my mind whether the O2 sensor is faulty or whether it is elsewhere.
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