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First you will want to check all the connections behind the drivers side kick panel and at the drivers side fuse panel. If you ever had a water leak (whether you knew you had one or not), the connections in this corner are prone to corrosion and can cause this code to set.
Its not always safe to assume that because you have a code for the APP, that the APP is bad, however it is the most likely cause. The only way to replace the APP sensors, is to replace the whole Accelerator Pedal assembly.
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