Get it plugged into some proper Volvo gear - it will more than likely tell you exactly what is wrong. Generic readers often give generic error messages... you will also be able to see the values being returned from the pedal sensor.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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