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International Automotive Technicians Network
Re: Clearing (or not) Mode 9: In use Performance tracking
Posted to Technical Theory Forum on 12/12/2020

You're welcome Jamey T.,

All of these modes and PID's are hard to keep track of. Back in the early days, most people could remember common codes because there was only a hand full of them. Now there are literally hundreds of codes and sub identifiers.

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