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code 21

hello can any one tell me what code 21 is?
first i had code 10/20 i replaced 1 transisitor for the left drive motor
now i have only code 21.
right drive motor spins with steer wheel straight.
left motor doesnt spin
  • Posted 18 Aug 2009 04:56
  • By petect
  • joined 18 Aug'09 - 2 messages
  • Connecticut, United States
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