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Message: <blockquote data-quote="sxyxc" data-source="post: 167331" data-attributes="member: 9729">new problem!!! ok now its reading my pass side bank 1 O2 sensor has low voltage and running car lean.. it switches between that and the P1151 Lack of H02S-21 switch, sensor indicates lean code, i reset them and then in about 15-20 miles it comes on again.. also i know that this is really bad, but i drive this car ALOT even with the error codes, i kept reseting i drove around 120 miles today.. in city, stop and go, and stuff.. i need this fixed..also what would be ways to get better MPG mine is really bad, and worste now with this problem... i normaly get about 14-15 on a stock mustang gt vert auto...</blockquote>