I got the exact same advice from a Volvo tech AMM or ECU, I re[placed the AMM and it's the same. The ECU is plug and play. Make sure your battery is disconnected first though. That's key. I'm trying to find a used ECU on the internet but am striking out finding the same number as the one that came ...

[/quote]I have had a mechanic look at the problem and thats when we changed the mass air flow sensor. He suggested the next thing would be the ECU. The mechanic is not specifically a volvo specialist so I hate to spend money on his time when I can do the same thing (guess). The ECU cost ~400$ and se...

my 92 740 will not idle runs too lean have changed mass air flow controller engine check light on but readout is 1 1 1. Have cheked 12voltsdc at ECU connector and grounds are good. should i change the ECU and what is the procedure to do so? (is it just plug and play?)