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Replacing all vacuum hoses and PCV valve will often reduce these nuisance 700 range codes. Experienced a 471 recently and after checking electrical system, found low alternator output and excessive alternator ripple voltage. Changed alternator and fault did not return.
Maybe just a coincidence, time will tell.
Have also noticed the faults become more frequent with engine age/hours.
  • Posted 25 Feb 2018 07:05
  • By tom_p
  • joined 21 Feb'11 - 198 messages
  • Alberta, Canada

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