The camshaft position sensor on a 1991 Acura Legend is located at the back of the camshaft, near the rear bearing cap. It monitors the rotation of the camshaft and relays this information to the vehicle's computer.
On the 3.1L & 3.8L engines, the CMP sensor is located on the timing cover, behind the water pump, near the camshaft sprocket.
under the water pump.
On vehicles equipped with a camshaft position sensor, it is used to help the PCM determine the correct firing order.
engine light will go on and give you code
Cam sensor is inside the distributor under pick-up coil. Some say whole distributor has to come out to replace, some have snuck it out by removing pick-up coil.
On the V6 its in the block between the two heads and right behind the timing chain
inside the distributor
The 1991 Ford Explorer 4.0 engine does not use a cam sensor, but rather a crank sensor at the lower front of the engine to set crank or time position, two bolts and one connector.....
Driver side of the bell housing.
It is located on the firewall side of the engine. Towards the passenger side. Just above the oil pan. (The original respondent) just replaced one on a 1991 3.1 liter. I was lucky that I had access to a lift. It was sort of a pain but I got it replaced in about 45 minutes. The bolt is 8mm. Use a 1/4 drive with a long extension.
paste this into your browser...i could not get the link box to take.. but this should ansewr the question on the o2 sensor