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The Electronic Voltage Regulator (EVR) is not a separate component. The voltage regulator is actually a voltage regulating circuit located within the Powertrain Control Module (PCM). The EVR is not serviced separately. If replacement is necessary, the PCM must be replaced.
Code 1705 is labeled "gear position switch shorted". If all is well with the transmission , i.e gear display is correct , shifts well etc problem may well be of a sporadic nature.
Does the plug from the GPS fit securely? Some plugs are not configured for domestic receptacles. If the cigarette lighter works properly the socket is OK.....
No. Requires interrogation , correction and clearing via appropriate scan tool...
It has a timing belt. Replacement interval per VW is at 105,000 miles. Realistically should be done at 60,000 to 90,000 miles.
Is the gear display fully highlighted , that is all gears displayed at once? If so the transmission is in "limp mode". At this point I would scan the vehicle to retrieve any fault codes stored. You can go forward with a diagnosis from there. Make sure the fluid level is correct , double check the installation , i.e drive shafts , shift cable , torque converter/drive plate and the like. If this a new transmission and it is an internal failure you may have a warranty. As an aside it is VERY EASY to damage the oil pump at the front of the transmission if the torque converter is not properly seated when the engine/ transmission are bolted together......
A 1991 model has a completely mechanical hood release. The Targa models have a locking release knob , same key as doors. Just pull the release cable , by the drivers left knee.......
If it is amber with a logo resembling "electricity" you are seeing the check engine light. If so you need to have the vehicle scanned to retrieve the fault info.
Since brakes are involved be cautious. If you are so inclined , properly remove that wheel and carefully inspect the suspension and brake components for loose/worn parts such as bolts and bushings.
Since a fault code has been set , if you scan the vehicle the information you get will probably answer your question. Many auto parts stores will scan vehicles as a courtesy.