Re: Affordable knowledgeable Sprinter Repair Service Mechanic in Nashville or Atlanta
I only mention the ABS sensor because it is one thing that won't let it out of PARK. But it's not all that common. If you start the engine and the ABS light (and the spinning tire light) stays on, then the ABS sensor could be bad (unlikely) or the sensor has gotten out of alignment at one of the wheels (usually after a brake pad change or something like that). Replacing the clockspring in the steering wheel and not getting the steering position sensor back in the proper position, or having the steering severely out of alignment, can also cause the ABS light to remain on and thus. More common with these issues are a loss of power brakes (and, of course, ABS brakes), but will generally still let you put it in gear without the pen/pencil trick.
Most likely, it's a brake light, or the fuse, or the brake switch (either replace or "reset"), in that order. In any of those cases you should be able to get in out of PARK and drive it to someplace to get a fuse, bulb or have the switch replaced, without towing it.
The earlier Sprinters had dual filament brake light bulbs. If you put the bulb in upside down the brake lights would be on when the brake pedal isn't being touched, and then they'd go out as soon as you press the pedal. The exact opposite of how they're supposed to work. When that happened the van wouldn't even start. A lot of tow bills got paid over something that simple (and that stupid, engineering-wise, IMHO).