Volkswagen Golf 1999 Service Manual page 603

Readiness code
Significance of figures in 8 digit number block, display zone 1 - Readiness code
The readiness code is generated only when all display zones show 0
1 2 3 4 5 6 7 8
0
0
0
0
0
0
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0 Three Way Catalytic Converter (TWC)
0 Three Way Catalytic Converter (TWC) heating (currently no
diagnosis/always "0")
Evaporative Emissions (EVAP) Canister system (Tank
ventilation system)
Secondary air system
Air conditioner (currently no diagnosis/always "0")
Oxygen Sensor (O2S)s
Oxygen Sensor (O2S) heating
Exhaust gas recirculation (not installed/always "0")
Diagnostic function
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12/2/2005