tr Volvo 850 ECU Up for sale is a Working, in excellent condition Volvo 850 ECU, Bosch part number — 0 261 203 936 / 0261203936 Volvo Part number P09189155. This came out of a 1996 Volvo 850 turbo. This unit offers a 30 day functionality warranty. This may fit other years too, 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 ECU is one of the most common no start or random stalling problems with these cars. These can also cause issues with erroneous check engine lights as well as emission control & cold or hot start problems. This is also commonly the issue if the car randomly dies, but later on starts and runs fine. An erroneous check engine light is especially problematic, as the car will not pass the emissions portion of the test at the annual state inspection.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 more than $1,000!). Even now finding a good one second hand is getting to be quite difficult as these cars get older. Most Volvo 850 ECU's are located in "the black box" on the right side of the engine bay. They are easy to access, all you need is a 8MM wrench to remove the lid, once inside they have quick connectors and will slide right out!