Up for sale is a Mercedes Bosch D-Jetronic Throttle position sensor.  Good working used condition 0 280 120 015  -  Classic Mercedes D-jetronic systems are fairly reliable, however the sensors are quite critical!  The D-jet system has no diagnostic function or check engine light, so testing of sensors by the tests in the manual is the only way to properly diagnose this system!  

#1 step, check all connections, and grounds for the D-jet system.  If these are good you probably have a bad sensor.  One of the sensors is the TPS!  A defective TPS will prevent the D-jet system from running properly, or at all!

This is a good working unit, with a 30 day functionality warranty.