I dont think there IS a reader that costs $500 that you can't get all the functions of for under $200. The guys with the Ohio group (who hold tech days several times a year) are using the CRP123 products. They can do stuff my BOSCH cant and again, way less than $200.
While it is probably the sensor in the pedal, I have this cardinal rule: Remove mods to confirm the cause before spending money on parts/modules. But Im not made of money like many gearheads are. Back when I put the $350 windrestrictor in, I about cried over that money.