Volkswagen Lambda Sound control ECU Up for sale is a Working, in excellent condition VW ECU. Works on a variety of VW cars starting from 1984 on up. Bosch Part number-- 0 280 800 060 (0280800060) VW part number 035 906 263 F (035906263F) This unit offers a 30 day functionality warranty. As always with this type of component your best bet is to match the part number to the one on your original ECU. A faulty lambda sound ECU can be a real problem with these cars. Basically this ECU is the oxygen sensor control system that powers the auxiliary fuel injector (also known as the frequency valve) and adjusts the cars fuel curve based on readings from the o2 sensor. These are generally fairly reliable units but can easily be damaged by wiring faults or voltage spikes (caused by a bad alternator). The car will usually still run with a bad ECU, but it can also cause issues with erroneous check engine lights as well as emission control & cold or hot start problems. Also can cause stalling, poor power, poor gas mileage or excess smoke. If your car does not have these issues but you intend to keep it a while, I recommend our customers keep an extra ECU in the trunk. These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and you can never find one when you need one. Even now finding a good one second hand is getting to be quite difficult as these cars get older.