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The code P1717 is relating to a problem in the shift position indicator switch. That is the part that tells the computer which gear ( P, R ,D N ect.) you have selected. It could be a problem with the switch, a wire connection or the adjustment of the switch.
Volkswagen vehicles built after 1996 are equippedwith a system of sensors known as On Board Diagnostics (OBD II). These sensorsmonitor many vital engine functions and help to lower harmful emissions. Whenone of these sensors fails it sends a signal to the engine computer to illuminate the "CheckEngine" light in the dash. To clear this light you will need a diagnosticcode scanner. Scanners range in price from $40 to $120 and are available atmost auto parts stores.
1. Connect the diagnostic code scanner to the vehicle's diagnostic port. Theport will be located in the dash below the heater controls..
2. Turn the key to the"Run" position, but do not start the engine.
3. Press the button on thescanner that reads "Scan for trouble codes."
4. Wait for the scanner to finishscanning the engine's computer.
5. Press the button on thescanner labeled "Clear all trouble codes."
6. Disconnect the diagnostic codescanner from the vehicle.
Read more: How to Reseta Volkswagen Check Engine Light ' eHow.com
P1780 Park/Neutral Position Switch Malfunction (Only For A/T)
This code is related to a malfunction with the park neutral position switch, it's located on the transmission.
It maybe easier to get a Chilton manual from the autoparts store to locate the sensor/switch. The book runs about $20.
Replacing the switch/sensor may resolve the reverse light problem also.