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    HELP! Troubleshooting guru needed: P0155 will not go away

    Hoping someone here knows where I can begin to track down this problem as Googling and forum searching has not revealed any answers. 2005 Mustang GT, K&N cold air, matching Diablosport K&N FIPK tune (both in the car for about three years now, no issues) Problem: Constant p0155 code What I...
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