Volvo engine ECU Up for Sale is a Working, in excellent condition Volvo ECU. This is the unit that works with many non turbo volvo 740's and 940's Part number 3531658. 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 a common no start or random stalling problem with these cars. These can also cause issues with erroneous check engine lights, idle control problems as well as emission control & cold or hot start problems. Low power & lean running are also fair game. I have also seen fuel pump relay turn on faults (ECU won't turn on the fuel pump), as well as an condition where the high speed injector driver has failed. This causes the car to sit and idle fine, but it won't accelerate. Comes with a 30 day functionality guarantee, please see the details related to this on the return policy details section of this listing.Thanks for looking!