SOUNDS LIKE THE SENSOR IS JUST BAD,, BANK 1 ON A CAR USUALLY MEANS THE SIDE OF THE ENGINE THAT THE NUMBER 1 SPARK PLUG IS ON,,, FIND OUT YOUR FIRING ORDER AND CHANGE THIS O2 SENSOR,, THEY R ROUGHLY 65 BUCKS NEW,, IF THEY TRY AND SELL U A MAZDA ONLY ONE FOR OVER 100 ASK THEM FOR ONE THAT FITS ALL CARS,, I FORGET WHATS IT CALLED BUT IT WORKS ON ALL VEHICLES... ITS LIKE 65 BUCKS,, IF U PLAN ON CHANGING IT YOURSELF ITS A 7/8 BOX END WRENCH AND YOULL NEED HEAT TO GET IT OUT OR RUN THE VEHICLE TILL THE EXHAUST IS HOT OR USE PROPANE TORCH,, THEY ALSO SELL AN O2 TOOL FOR LIKE 10 BUCKS, ITS A SOCKET WITH A SLIT IN IT FOR THE WIRE TO PASS THRU,, MIGHT SAVE YA 100 IN LABOR IF YA DO IT YOURSELF,,ART... REMEBER TO DISCONECT THE BATTERY AND WAIT 3 MINUTES THEN RECONNECT IT BEFORE U RESTART THE CAR TO ERASE THE OLD TROUBLE CODES,,, THE CAR MAY TAKE A FEW MINUTES TO RELEARN ITSELF AND THEN WILL RUN SMOOTHLY FOR YA,,,ART
my co2s in bank 1 of my car is reading bouth to lean and rich it's a 99 mazda 626...
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