Oxygen sensores located yukon 2008 - 2008 GMC Yukon

Which O2 sensors came out of the vehicle an which did you put back in ? Two different types for that vehicle.

DTC P0134 or P0154 (w/LR4 and LM7 w/ Delphi HO2S)
DTC P0134 or P0154 (w/LR4 and LM7 w/ Denso HO2S)
DTC P0134 or P0154 (w/LQ4 w/Denso HO2S)

follow exhaust system o2 sensors look like spark plugs mounted to the pipe also before and after cat converter

Anrez, your 1991 Chevy trucks O2 sensor could be located in the Y pipe just ahead of converter or in the front portion of the converter.
Check the attached links,instruction and guides, Good luck
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its on the side of the motor that cylinder #1 is on in that exhaust pipe that comes off that head. its the first exhaust sensor that you come to when you follow the exhaust pipe.

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 Charles,

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.

Oxygen Sensor Locations

I have changed out one of mine; quite easy, but you need a sensor wrench which you can find an any automotive store for around $15.

The part is available readily enough - link attached.

Good luck

Bank one is the drivers side. If it is bank 1, sensor 1 the it is in front of catalytic converter...if it is bank 1, sensor 2 then it's the sensor behind the converter on the drivers side

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

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

1999 GMC Truck Yukon 4WD 5.7L SFI 8cyl
The Oxygen Sensor is located under vehicle, passenger side, below seating area, rear of catalytic converter, mounted in driver side exhaust pipe.

Application: With dual catalytic converter
Number two

Hope helped (remember rated this help) Good luck.