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Re: troble code p 0551
The power steering switch monitors high steering pressures and tells the PCM that your pump is generating high pressure, so up the idle so that the motor doesn't lag during parking procedures. When you open up the hood, look behind the power steering pump pulley, and you'll see it. If you don't see it there, check anywhere between the rack and the pump, it'll be mounted somewhere along that line on the pressure side.
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