Where is power steering pressure sensor located?

Which power steering system does your vehicle have ? EPS - electric power steering or hydraulic power steering . Do you have a EPS light lit on the instrument cluster ?

Power Steering System Description and Operation (EPS)
The power steering system reduces the amount of effort needed to steer the vehicle. The system uses the powertrain control module (PCM), body control module (BCM), power steering control module (PSCM), discrete battery voltage supply circuit, steering shaft torque sensor, steering wheel position sensor, power steering motor, driver information center (DIC), and the serial data circuit to perform the system functions. The PSCM and the power steering motor are serviced as an assembly and are serviced separately from the steering column assembly. The steering shaft torque sensor and the steering wheel position sensor are not serviced separately from each other or from the steering column assembly. The steering column assembly does not include the power steering motor and module assembly.

Power Steering System Description and Operation (HPS)
The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The hydraulic power steering pumps are either belt-driven or direct-drive, cam-driven.
The power steering fluid reservoir holds the power steering fluid and may be integral with the power steering pump or remotely located. The following locations are typical locations for the remote reservoir:
• Mounted to the front of the dash panel
• Mounted to the inner fender
• Mounted to a bracket on the engine
The 2 basic types of power steering gears are listed below:
• A recirculating ball system
• A rack and pinion system
In the recirculating ball system, a worm gear converts steering wheel movement to movement of a sector shaft. A pitman arm attached to the bottom of the sector shaft actually moves one tie rod and an intermediate rod move the other tie rod.
In the rack and pinion system, the rack and the pinion are the 2 components that convert steering wheel rotation to lateral movement. The steering shaft is attached to the pinion in the steering gear. The pinion rotates with the steering wheel. Gear teeth on the pinion mesh with the gear teeth on the rack. The rotating pinion moves the rack from side to side. The lateral action of the rack pushes and pulls the tie rods in order to change the direction of the vehicle's front wheels.
The power steering pressure hose connects the power steering pump union fitting to the power steering gear and allows pressurized power steering fluid to flow from the pump to the gear.
The power steering return hose returns fluid from the power steering gear back to the power steering fluid reservoir. The power steering return line may contain an integral fin-type or line-type power steering fluid cooler.
In a typical power steering system, a pump generates hydraulic pressure, causing fluid to flow, via the pressure hose, to the steering gear valve assembly. The steering gear valve assembly regulates the incoming fluid to the right and left chambers in order to assist in right and left turns.
Turning the steering wheel activates the valve assembly, which applies greater fluid pressure and flow to one side of the steering gear piston, and lower pressure and flow to the other side of the piston. The pressure assists the movement of the gear piston. Tie rods transfer this force to the front wheels, which turn the vehicle right or left.
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Your Power Steering Pressure Sensor is located on the pump. It is easy to break. Use care while removing one wire electrical connector.

There is no power steering "sensor". There is a power steering pressure "switch". If this is what you are looking for, it is located on the power steering pump.

its screwed in the power steering high pressure line. The line isnt that long, so you dont have far to look. it may be near the steering rack.

The Power Steering pressure switch is mounted in the pressure line between the steering gear and the power steering pump.

Good Luck

You will find the power steering pressure sensor located in the hi pressure line of the system.

The oil sending unit is located below the power steering pump. 
You can get to it by removing the alternator, then the three bolts around the power steering pump bracket. Remove the small pulley on the bracket and pull back on the power steering bracket. Look behind bracket and you will see the oil sending unit. 

Disconnect the wire from the oil sending unit. Use a deep socket (1 1/16) to remove unit. 

While you have unit remove, I would go ahead and use an oil pressure gauge to test the oil pump pressure. 

Good luck and hope this helps

i have changed the pressure sensor switch on my 2001 PT Cruiser (B). to find it you will have to put the car on ramps and go under the car until your under the cross member (right behind the front wheel) it will be just behind the cross member closer to the driver side wheel. remember once you remove the sensor gravity will work against you and power steering fluid will pour out of the sensor hole. and when under a car there is really no place to go and if your not careful you will have to resign yourself to being covered in fluid. good luck!

The power steering pressure switch as its called threads in to the power steering pressure hose most of the time it is close to the power steering pump, I have also seen them at the lower point of the pressure hose close to the rack and pinion.