DTC Chart
VW Golf & GTI Quick Reference Specication Book • September 2012 241
Additional Exhaust Regulation
DTC Error Message Malfunction Criteria and
Threshold Value
P0420 Catalyst System Efîš¿ciency
Below Threshold
Front:
• Oxygen storage capacity
(OSC) vs OSC of borderline
catalyst < 0.40
• Front catalyst < 1.30
• Main catalyst < 1.20
Main:
• Oxygen storage capacity
(OSC) vs OSC of borderline
catalyst < 0.40
• Front catalyst< .90
• While value for front catalyst
< 2.00
P0441 Evaporative Emission System
Incorrect Purge Flow
Actual evap pump current
difference between reference
measurement to idle divided by
pump current difference from
the last leak detection phase
during engine off > 1.40 mA
P0442 Evaporative Emission System
Leak Detected (Small Leak)
Modeled pressure from pump
current < 9 hPa
P0444 Evaporative Emission System
Purge Control Valve Circuit
Open
Signal voltage > 4.40 - 5.40 V
P0456 Evaporative Emission System
Leak Detected (Very Small
Leak)
EVAP leakage area calculated
from pump current curve > 0.17
mm 2
P0458 Evaporative Emission System
Purge Control Valve Circuit
Low
Signal voltage 0.00 - 3.25 V
P0459 Evaporative Emission System
Purge Control Valve Circuit
High
Signal current > 2.2 A
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