pmajet

Can't find the thread on this issue but it was useful. Told by Mercedes dealer the ECM is bad and will need to replace but not sure if it will fix the problem. Can you believe that? Have replaced the supercharger clutch and air flap motor. Check engine light continues to come on and power fades in an out as car is driven over a period of 10 minutes or so. Have following fault codes. P1420, P1235, P1236, and P1525. Help! This is a great car!

Read that there is a relay K40 in the ECM that could be the culprit. MAS?