Two problems related to engine and engine cooling have been reported for the 2006 Volvo S40. The most recently reported issues are listed below.
My 1 1/2 years old Volvo S40 did this twice, shortly after starting it and moving it for a couple of miles. It displayed the message "brake failure stop car safely", "anti-skid system failure", "reduced engine performance". The car could not go more than 15 mph. After parking it, I could not restart the engine and the messages kept repeating in random order. The first time that I took it to the dealer they said that they changed the computer message module (the mechanic carried a box with many plugs in it, just to show me what it looked like). But just after 500 miles, the problem re-appeared. Now the car is in the repair shop, and people do not know what to do with it for two weeks.
When I signed a purchase order on 5/10/08, the odometer disclosure statement was 6225 miles. Jackson Volvo service at hilo did not give me the copy of odometer disclosure statement. It was delivered on 5/12/2008. Then the odometer disclosure statement showed 106,225 miles. The a/c also became very polluted.