At the moment we have a Bettle in with the Check Engine Lamp On. I carried out an mot test on it and didn't notice any lights on in the instrument display, and it did pass the emissions test.
The car was then serviced by one of my colleagues before the car left us. The following day the car arrives back with the lamp on. My boss puts his Snap On scanner on it and diagnosis Lambda Sensors faulty?
So they are changed and the lamp is still present, the fault still exists?
Today he asks me to have a look at lambda sensor 2, he says that this sensor is 'open circuit' and stopping the front lambda sensor from switching?
I checked live data on the scanner and the lambda sensor 2 voltage was reading up to 0.40 Volts.
The front lambda sensor reading with regards to the Snap On scanner live data reading does not exactly make it clear that it is reading the voltage?
The reading shows 0.998 - 1000, mostly reading 0.998, but no symbol 'V' to indicate whether it is reading voltage or a ratio?
Anyway I was not convinced that the lambda sensors were faulty and I advised my boss that I was not convinced they were. The front lambda sensor 1 before the cat reading 0.998 - 1000 to me does not look as though it is switching correctly, but when I checked the graph view the lambda looked to be switching, this was very confusing?
I noticed also in live data that a misfire count of 02 was present. I looked on the graphs and a misfire count of 05 was present, were cylinders 01 and 03 were behaving abnormally although you could not audible hear a misfire.
This is wear we are up to, I think may be the wrong type spark plugs fitted, but does anyone know of any other faults that may cause this condition?
David
The car was then serviced by one of my colleagues before the car left us. The following day the car arrives back with the lamp on. My boss puts his Snap On scanner on it and diagnosis Lambda Sensors faulty?
So they are changed and the lamp is still present, the fault still exists?
Today he asks me to have a look at lambda sensor 2, he says that this sensor is 'open circuit' and stopping the front lambda sensor from switching?
I checked live data on the scanner and the lambda sensor 2 voltage was reading up to 0.40 Volts.
The front lambda sensor reading with regards to the Snap On scanner live data reading does not exactly make it clear that it is reading the voltage?
The reading shows 0.998 - 1000, mostly reading 0.998, but no symbol 'V' to indicate whether it is reading voltage or a ratio?
Anyway I was not convinced that the lambda sensors were faulty and I advised my boss that I was not convinced they were. The front lambda sensor 1 before the cat reading 0.998 - 1000 to me does not look as though it is switching correctly, but when I checked the graph view the lambda looked to be switching, this was very confusing?
I noticed also in live data that a misfire count of 02 was present. I looked on the graphs and a misfire count of 05 was present, were cylinders 01 and 03 were behaving abnormally although you could not audible hear a misfire.
This is wear we are up to, I think may be the wrong type spark plugs fitted, but does anyone know of any other faults that may cause this condition?
David
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