My '91 960 wagon experiences an intermittant problem where the E, W, and UP arrow on the dashboard flash. Cannot find determine any causes from a driver standpoint. The dealership stated that they did not find any code problems and that it should be driveable. I have read that it could be a gear position sensor/PNP switch. Are these the same thing or two different parts, and what does each do? Best guesses as to where to start or what to try first. Thanks.