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Correct me if I'm wrong but the parameter you have selected in your graphs is the PRE cat sensors, is this correct? If so then they should be swinging up and down between rich and lean. The graph you have indicates very aged PRE cat 02 sensors and both should be replaced. How many miles are on this 02?
Last edited by 911monty; 07-17-2017 at 06:26 PM.
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