O2 sensor location?

LARRYW60

MEMBER
2003 GMC SONOMA
18,900 MILES

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?

Saturday, June 30th, 2012 AT 12:05 PM

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

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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Saturday, June 30th, 2012 AT 12:26 PM

KEN GOULD

MEMBER
1 POST
2003 GMC SONOMA
6 CYL
2WD
AUTOMATIC
114,000 MILES

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.

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Monday, January 4th, 2021 AT 9:16 AM (Merged)

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