SOURCE: Yukon Denali Fuel Trim bank One and Two running too lean?
Could also be fuel filter, pressure, vacuum leak, etc. Check these two articles out, they should help too - http://www.obd-codes.com/p0171 and http://www.obd-codes.com/p0174
SOURCE: where are the oxygen sensors located?
There will be one located before, and one located after the catalytic converter for each exhaust that you have
SOURCE: where is Bank 1 sensor 1 located
Start at the exhaust manifold flange on the drivers side. The first sensor you come to before the cat. converter is the sensor you are looking for.
SOURCE: where is bank one oxygen sensor located at on a
Need more information but here is where all your O2 sensors are located
Bank 1 Sensor 1 - Driver's side, before catalytic converter
Bank 1 Sensor 2 - Driver's side, after catalytic converter
Bank 2 Sensor 1 - Passenger side, before catalytic converter
Bank 2 Sensor 2 - Passenger side, after catalytic converter
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