My wifes car is giving me fits.The check engine light came on and autozone told me it was a 1074 code which read bank 2 sensor 1 lean and cyl 4 misfire.I bought a A/F sensor from denso and had a mechanic put it in and reset codes.I should mention it ran awesome before just had c.e.l. It began stumbling and threw a code for bank 1 sensor 1 which happens to be the same sensor only behind the engine .Bought that Denso sensor and paid him to replace it.No bueno!!! it still misses on acceleration and stumbles AHHHH!!!!!
ANY HELP WOULD BE GREAT.Thanks ahead of time

 

Trace and fix the misfire first. A good working sensor will report unburnt gas in the exhaust. You start by swapping a known good coil and spark plug with the offending.

Whenever people go to a mechanic, I always suggest that they let the mechanic do the diagnosis [be informed customer].

Salim