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The o2 sensors are located on the exhaust system.The upstream in on the rear exhaust manifold and the down stream is in front of the catalytic converter.Usually when they are bad they will make the check engine like go on.Make sure the air filter is clean,tires at correct inflation,alignment is to specs.If the vehicles pulls to one side or the other or steering wheel is not straight when driving down a straight stretch of road.Also tires are wearing normal.Use cruise control where ever on highway.If you let your vehicle warm up in winter.This also uses gas.Hope this helps.Good luck.
O2 Sensor Heater Failure Oxygen sensor heater element malfunction solution replace the oxygen most likely the one located in the cat. converter make sure the replacement is original equipment(oe)
Hi bank 2 is reffering to the side of the engine that the #2 cylinder is on and sensor 1 will be the one up infront of the catylitic converter toward the engine!
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