Skoda OCTAVIA MK1 Service Manual page 224

If the lambda controller stands against the stop and the display for
the condition of the mixture is shown permanently on "1", the
lambda control has reached the control stop in direction "lean off",
however the lambda probe still detects "mixture too rich".
The following appears in the display:
If the lambda controller stands against the stop and the display for the
condition of the mixture is shown permanently on "0", the lambda
control has reached the control stop in direction "enrich", however the
lambda probe still detects "mixture too lean".
Note
If the lambda controller stands at the stop for a certain period of time,
no matter if in direction "rich" or "lean", a fault is stored in the fault
memory.
If the lambda control functions properly, check lambda learned
–
values.
– Press the button C.
Enter 011 for the display group number 011 and confirm entry with
–
the Q key.
The mixture adaptation is adaptive, i.e. differences between the engines
(nozzle flow rate, compression, fuel pressure) are detected via the
lambda control and compensated through the adaptation of the basic
injection time programmed in the characteristic diagram. The injection
time is extended or shortened until a mixture with λ = 1 is achieved.
The following appears in the display:
The lambda learned value is displayed in idling in the
display field 2.
positive learned value (+0ms): programmed basic
t injection time too short, actual injection time by 0ms
longer, so that λ = 1 is achieved.
negative learned value (-0ms): programmed basic
t injection time too long, actual injection time by 0ms
shorter, so that λ = 1 is achieved.
The lambda learned value is displayed in the partial load
range in the display field 3.
Values greater than 1: programmed basic injection time
t too short, actual injection time longer, so that λ = 1 is
achieved.
Values less than 1: programmed basic injection time too
t long, actual injection time shorter, so that λ = 1 is
achieved.
Reading measured value block
11
3 ms
00000010
224
850/rpm 90°C
+25% 00011111
Reading measured
value block 99
->
850/rpm 90°C
+25% 00011110
->
+1.00 ms 1.00