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GM products have 4 O2 sensors attached along the exhaust pipes coming off the manifold. Bank 1 is aligned to cylinder 1 on the engine which is the driver's side. Sensor 2 is the one after the convertor (Sensor 1 being the one before the convertor). Link attached for more information.
I know this is an old post, but I found the solution for my 01' Yukon P0171 and P0174. I have changed all the vacuum line and the PCV, throtle body gasket, MAF, plugs wires, fuel pressure reg. All was changed and the codes always came back.
I finally noticed the purge valve on the manifold was constantly purging. I replaced the purge valve abnd code has not been back. It was $40.
Dear Sputtering Misfire........okay....so...here's how it goes. The "fuel induction service" that was performed was performed properly.....but not completed....this is when they introduce a topend chemical that knocks off all the carbon from the valves and upper piston area etc...the vehicle's fuel curve becomes temporarily disrupted resulting in poor fuel burn and misfire symptoms. After the chemical is introduced through the intake system the vehicle should be ran at a higher rpm to remove all carbon deposits if any are left over after the service. When this last stage isn't performed then the vehicle has the symptoms that you are experiencing. This will go away.....it may take up to 60 miles of driving.....the engine light will not go off until it is physically reset by a technician or your battery cable is removed and replaced after a minute.....please get back to me if you need any more help... I HOPE I COULD HELP!!!
if you look at the front of the motor you will notice one cyclinder is further forward then the other... that first cyclinder would be 1. i'm guessing the side opposite to cyclinder one would be bank two.