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code po551 refers to power steering pressure(PSP) sensor/ switch--range /performance problem===causes --PS system--PSP sensor/switch
Have the power steering pressure checked as it may be a pump problem or just the sensor/switch.. Check the reservoir level as it may be lacking fluid.
Power steering pressure switch is shaped somewhat like a
spark plug (a bit too fat) threaded at one end and having a cylindrical plastic
body at other end. It is on the hose connecting the power steering pump with
the rack and pinion.
I HAD THE SAME PROBLEM WITH MY 2002 DODGE NEON. THE FIX WAS TO REPLACE THE POWER STEERING PRESSURE SENSOR SWITCH. IF YOU DO IT YOURSELF IT WILL PROBABLY COST ABOUT $50 OR $60 INCLUDING THE HAYNES MANUAL TELLING YOU HOW TO DO IT. I BELIEVE THE SWITCH COST ME ABOUT $30 OR $35 FROM A DODGE DEALER. IT IS PRETTY SIMPLE. TAKE OFF THE ELECTRICAL CONNECTION GOING TO THE SWITCH AND THEN TAKE OUT THE SWITCH ITSELF WITH A PROPER SIZED WRENCH. THE SWITCH IS THREADED INTO A CONNECTION ATTACHED TO METAL HOSES THAT HAVE POWER STEERING FLUID IN THEM. HAVE THE NEW SWITCH READY TO PUT IN AFTER THE OLD ONE COMES OUT,FOR POWER STEERING FLUID WILL FLOW OUT OF THE CONNECTION. PUT THREAD TAPE ON THE THREADS OF THE NEW CONNECTION. THIS WIIL HELP TO SEAL THE SWITSH FROM LEAKS. TORQUE TO SPECS AND REINSTALL THE ELECTRICAL CONNECTION. CLEAR THE CODE AND SEE IF IT COMES BACK. MINE DID NOT. OH YES, IT MIGHT BE A GOOD IDEA TO HAVE SOME POWER STEERING FLUID TO TOP OFF ANY THAT LEAKS OUT DURING THIS PROCESS.
Sounds like either the ignition switch on the column is not working or you have an ignition fuse blown. Check and make sure the switch is plugged up and have power coming out of it with key on. If no power coming out check the fuses then the switch. should fix the issue.