Why is check engine light BACK on after installing flow master muffler?
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Mechanic installed rebuilt cat converter. Light off until I had flowmaster installed & light back on. Tried new gas cap. Mechanic reset computer, light off briefly but came back per his prediction. It went off before I got back to him, but returned. Have taken off battery cable=off but returned. Help??8
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The check engine light was on. Had catalytic converter replaced which fixed the problem. After install of new muffler, light came back on...