Volkswagen Passat 1995 Official Factory Repair Manual page 1533

Diagnostic mode, selecting
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Diagnostic mode 4: Reset/erase
diagnostic data
Function
This diagnostic mode performs the following
functions:
All emission relevant malfunctions in DTC
memory will be erased,
The operating conditions at which a malfunction
was stored will be reset
Diagnostic mode 2: Operating conditions,
All adaptation values are being reset,
All test results of the diagnostic functions are
being reset.
Requirement
DTC memory was erased
Diagnostic mode 3: Check DTC memory.
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