Trouble code PO 440
Http://www.obd-codes.com/p0440
do the easiest cause first... did you recently get gasoline and didn't put the fuel cap back on correctly?
CLEAR the trouble code and re-seat the gas cap properly & then see if the check engine lights up with the same code... then go from there
i've embedded gbob59s link because it should have worked the first time
I googled: 1997 Volkswagen Cabrio po440
You may find a useful fix.
This may help https://www.youtube.com/watch?v=IzfR84T6pBY
Thermostat Rationality Test
Possible Causes:
Check the operation of the thermostat (it may be stuck open).ECT Sensor is contaminated, damaged or it has failed.Inspect for low coolant level or for an incorrect coolant mixture.Trouble Code: P0440
EVAP Purge System Fault
Possible Causes:
EVAP purge valve vacuum supply is leaking or clogged.EVAP purge valve is stuck closed.EVAP purge solenoid has failed.NVLD assembly (leak detection) is damaged or has failed.NVLD switch circuit is open or the NVLD switch has failed.Ground circuit is open.PCM has failed.Trouble Code: P0456
EVAP Small Leak (0.020") Detected
Possible Causes:
.EVAP fuel tank or canister vapor hoses leaking or damaged.EVAP system component leaking, fuel cap loose or missing.Leak detection pump damaged or leaking.Trouble Code: P0622
Generator Field Control Circuit Malfunction
Possible Causes:
Generator field control circuit is open or is shorted to ground.Generator field control circuit is shorted to system power (B+).Generator field ground circuit is open.Generator is damaged or PCM has failed.PCM has failed.Here are the codes and causes.
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