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TAke a paper clip or other wire and short "A"&"B" terminals together on the aldl test connector under the dash. Count the flashes of the check engine light with the ignition on. One flash pause then 2 flashes is a code 12 and means the system is working. Each code wil repeat 3 times, then the next one will show.
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everyone should have a manual for their vehicle, and the library should have a professional shop manual available in the reference section for FREE to make copies of...read up and fix like a pro!! :) Dave
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