The 2002 ford Ranger uses type R134 Freon. The Freon is added in the low pressure port of the ac system.
The oil pressure sending unit is located on the back of the block. it is the sensor located closest to the alternator.
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The oil pressure sending unit and the oil sending unit are the same. It is located almost directly under the alternator. Remove the alternator and removal is simple when you have the correct socket.
It is located under the alternator.
The OBDII connection is under the dash, near the steering column.
It's located to the left of the oil filter.
If it has the 4.3 engine, I remove the distributor to gain access to the oil pressure switch.
Low oil pressure or a defective oil pressure sending unit.
It is just above the oil filter.
It is on the fuel pump sending unit that is inside of the fuel tank.
the flasher unit is either in fuse box, or is in wiring under dash