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Error codes PO633, 551

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Old 10 Aug 2013, 07:11 pm
Fresh Cruiser
Join Date: Jan 2010
Posts: 34
Default Error codes PO633, 551

Thanks for the tricks to get the codes, worked fine. According to my Haynes manual, 551 is "incorrect power steering switch input detected". What does it do? Is it something that needs fixing if I don't want to end up in a ditch? The steering feels fine and fluid level is OK.
633 says"skim key not programmed in pcm". Is this related to the Stage1 module I installed 3 years and 8000 miles ago? I'm 76 and can't do my own work anymore so I'd like to know if I can just stick a piece of tape over the icon or spend a lot of necessary bucks at the local dealer.
Many thanks
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Old 10 Aug 2013, 07:23 pm
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Join Date: Sep 2001
Posts: 27,758
Default Re: Error codes PO633, 551


First, to get rid of the engine light, take off the negative battery cable for about 5 minutes. While off step on the brake pedal to get rid of residual charge. Then put it all back together. This will reset the computer and clear the codes.

The power steering switch monitors the pressure in your steering system. It does go bad and sometimes start to leak. It could also indicate a problem with the steering pump. Easiest thing to do is replace the switch and see if that is the cause of the fault code. (pic of switch below).

The other code could be a one-off and clearing the codes as described above might be the last you see of it. On the other hand, if you having any problems with the chipped key or fob, opening, locking or starting the car, you could have a skim problem.

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