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    Check Emissions message & light - hesitation - O2 Sensor? Which one?

    Car felt very lump and hesitating under part throttle , then seemed to be fine, then again it hesitated worse - full throttle and higher revs it seemed to be fine again but then all of a sudden CHECK EMISSIONS light illumunated. # OBD reader has 2 codes: P0135 - 02 Sensor Heater Circuit...