3" DP Question "Lambda"

[S3 TAM]

I've got her booked in for a Downpipe & Cat @ Pipewerx.

Is it worth changing the Lambda sensor at the same time?
how much work is it? i.e. simple connector or loads of wiring?

How many Sensors are there, I have seen one on the DP and one just after the CAT. is that correct.

Cheers

 

[finesse]

pre cat : 77
post cat : 89

ecp sell the OEM Bosch lambda

easily done even for me. just need a penetration fluid

worth changing? no

 

[Dane]

penetration fluid

 

[S3 TAM]

pre cat : 77
post cat : 89

ecp sell the OEM Bosch lambda

easily done even for me. just need a penetration fluid

worth changing? no

funny guy

cheers for the info i might not bother, if it aint broke don't change it.

 

[finesse]

you can test pre/post health through vcds to see if all is well

will paste the guide later when home

 

[S3 TAM]

you can test pre/post health through vcds to see if all is well

will paste the guide later when home

Cheers Buddy

 

[finesse]

Block 034 - Ageing of Pre-Cat Oxygen Sensor

Enter the Basic Settings block 034.

Field 2 shows the Exhaus Gas Temperature, measured by the oxygen sensor. It
must be above 350°C for the test to succeed.

The value in field 3 is called “dynamic factor”. It is an indicator for lambda probe
ageing. The value should be above 0.5; the value for a new sensor is ~2.0. It will
decrease as the sensor ages.

The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S1 OK' or 'B1-S1 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.

Do not continue with testing unless the field 4 is indicating “B1-S1 OK”.

2.8.5 Block 036 - Post-Cat Oxygen Sensor Diagnosis
Enter the Basic Settings block 036.

The field 2 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.

Do not continue with testing unless the field 2 is indicating “B1-S2 OK”.

2.8.6 Block 037 – Lambda System Diagnosis
Enter the Basic Settings block 037.

The value in field 2 is the post-cat lambda probe output voltage, with range of
0.10 … 0.95V. It should remain as constant as possible. Considerable voltage
fluctuations are an indication of catalytic converter damage. A constant voltage of
0.450V is an indication of damaged wiring.

The third field is lambda correction value between the pre and post-cat sensors.
It should stay below 0.02.

Note. If the lambda probe voltage is OK and the lambda correction value is still
greater than 0.02, even after a test drive, this is an indication of ageing of the
lambda probe upstream of the catalytic converter.

The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'System OK' or 'System NOT OK' afterwards. It may take several minutes
to obtain result of diagnosis.

Do not continue with testing unless the field 4 is indicating “System OK”.


2.8.7 Block 043 – Ageing of Post-Cat Oxygen Sensor

Enter the Basic Settings block 043.

The field 4 will say either 'TEST OFF/ON' before/while the test is running, and
either 'B1-S2 OK' or 'B1-S2 NOT OK' afterwards. It may take several minutes to
obtain result of diagnosis.

Do not continue with testing unless the field 4 is indicating “B1-S2 OK”