Mercedes / Bosch Idle Control computer. Mercedes part number 412 202 012 003 -From a salvage but running 380SE. Unit was fully runtested controlled idle properly in an actual car and is warranted for 30 days from purchase date. If you have a faulty unit but your valve works, your car may idle too fast or too slow depending on if it's cold or hot or stall in traffic. Very un Mercedes like... This should fix that! This is over for $300.00 from MB