Skoda OCTAVIA MK1 Service Manual page 182

If the fourth bit is set to "1", (lambda controller on stop), it can be recognized after the first
t
bit (mixture condition) in which direction the lambda controller rests on stop.
If the first bit continuously rests on "1", the lambda controller has thus reached the stop in
t
direction of lean but the lambda probe still measures a "fat" mixture.
If the first bit continuously rests on "0", the lambda controller has thus reached the stop in
t
direction of fat but the lambda probe still measures a "lean" mixture.
The functions of the lambda probe and the lambda controller are contra-rotative, i.e if the
lambda probe measures a "fat" mixture, the lambda controller must be directed to "lean".
t
However if the lambda probe measures a "lean" mixture, the lambda controller must be
directed to "fat".
t The lambda control cannot be switched on or off manually.
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