Quote:
Originally Posted by Brian Minson
Can someone tell me what these four sensors are on top of my 3.2 M96 engine?
Brian 
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As Woody said:
#1 is the Secondary Air Injection cutoff Valve
#2 is both the Oil Level and Oil Temperature sensor. (Dual-Function sensor is unique)
#3 is a knock sensor
#4, I can't really tell what you're pointing at. But if it looks like the image below, then it's your Oil Pressure Sender.
