Where is the oxygen sensor located in bank one on 2002 yukon Denali

I have an 02 Silverado. It has 4. Two upstream left and right bank, two downstream left and right bank.

Bank 2 is passenger side. Sensor 1 is the upstream oxygen sensor in front of the catalytic converter and sensor 2 would be downstream under the vehicle

You have four O2 sensors in your vehicle. Bank 1 and Bank 2. Typically it is Bank One, sensor Two that goes out from minor oil leaks on your engine. Here are a couple diagrams. Lay down behind your right front tire and look up. Look for cracked wires or burnt areas by connection. You can't always tell by looking. Easy to replace and fairly cheap.

Hi,
Please get the code first to locate the problem, before it get fixed.

it is the O2 sensor on the passenger side before the cat

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
Thank you for using fixya and good luck

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.

you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

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

They are all located in your exhaust system you have bank1 and bank 2 sensors 1 and 2 with a (4) oxygen sensor system. They are pretty simple to replace they kinda look like spark plugs screwed into the exhaust sytem with wire attached to them with a plug at the ends of the wires, usually the wire are colored white grey and black .Approximately 4 thin wires on each sensor. Easy to find start from the top of the engine and follow the manifolds downwards toward the tail pipe/pipes. There will be two on either side of the manifold before the converters and 2 after the converters. All you need is an oxygen sensor socket and A ratchet. The socket had a slot that allow you ro put over the sensors and wires or there is a "crow foot" type looks like a Brake line wrench work well too. You may need some liquid wrench/.WD40 maybe rusted a little bit. Counter clockwise to loosen and clockwise to install. Good Luck hope that I Fixed ya. Get back in contact if you need more help