o2 sensor location?

2003 GMC SONOMA
18,900 MILES
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LARRYW60
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Getting codes P0174 and P0155 on my 2003 GMC Sonoma 4.3 L, 2wd. Already replaced MAF, Dist (leak), fuel filter, Injectors (erroded and leak) and both upstream O2 sensors. Found gas cap loose 50+ miles after reading codes. Help?
Jun 30, 2012 at 12:05 PM
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RASMATAZ
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Where is bank 2 sensor 1? This guide will help us replace them with the locations below.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor


Heated Oxygen Sensor (Bank 1 Sensor 1) (4.3L VIN W)In left exhaust pipe, in front of catalytic converter.
Heated Oxygen Sensor (Bank 1 Sensor 2) (2.2L VIN 5)In exhaust system, after catalytic converter.
Heated Oxygen Sensor (Bank 2 Sensor 1) (4.3L VIN W)In right exhaust pipe, in front of catalytic converter.
Heated Oxygen Sensor (Bank 1 Sensor 2) (4.3L VIN W)In exhaust system, after catalytic converter

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Jun 30, 2012 at 12:26 PM
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KEN GOULD
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My question is where the malfunctioning o2 sensor is located. I was told bank #2 sensor #1 is defective, How do I know which one is defective there are four o2 sensors on this vehicle.
Jan 4, 2021 at 9:16 AM (Merged)
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SATURNTECH9
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Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.


https://www.2carpros.com/forum/automotive_pictures/416332_2003_gmc_sonoma_43L_o2_sensor_locations_1.jpg

There you go.
Jan 4, 2021 at 9:16 AM (Merged)