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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 24418" data-attributes="member: 11733">I attribute the "bang" she heard to an exhaust pipe smacking the frame as the engine was trying to idle at like 200-300RPM while misfiring like crazy. I also think the low RPM was causing the not moving forward issue from probable low line pressure in the transmission. Either way, transmission is fine which is a good thing!MAF and misfire codes are gone and haven't come back.I think you may have meant P0155 and not P0154? P0154 is "Heated O2 sensor (HO2S) insufficiency" where the P0135 and P0155 are "HO2S heater performance" codes.Thanks for the diagram!</blockquote>