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  1. 2015 Mustang GT w/ Roush Supercharger started throwing P1289 and P1299

    Ford Mustang Forum
    Hey all. First a little background. I have a '15 Mustang GT with a Roush SC and the Roush tune. The car has never had an work done nor has it had any overheating issues. The other day my wife pulled into the driveway and shut the car off. A few minutes later we went outside and tried to start...