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Engine light turned on, code reader said O2 sensor

Tiny
RAVEN1936
  • MEMBER
  • 2003 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Engine light came on so I attached my code reader to truck it produced codes saying the bank 1 o2 sensor 1 and bank 2 o2 sensor 1 were not functioning. Replaced both sensors and cleared codes after forty five minutes running the light came back on and produced the same codes.
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Saturday, March 2nd, 2019 AT 3:24 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

What were the exact codes?

Rarely does a code identify a bad part, just failed systems.

Roy
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Saturday, March 2nd, 2019 AT 4:41 AM
Tiny
RAVEN1936
  • MEMBER
  • 4 POSTS
Have also check fuse that's related to o2 sensor.
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Saturday, March 2nd, 2019 AT 9:18 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Got it. I need the code number.

Roy
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Saturday, March 2nd, 2019 AT 9:56 PM
Tiny
RAVEN1936
  • MEMBER
  • 4 POSTS
Codes are in the pictures attached.
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Sunday, March 3rd, 2019 AT 5:53 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sorry, no pictures attached. Can you repost?

Roy
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Sunday, March 3rd, 2019 AT 8:48 AM
Tiny
RAVEN1936
  • MEMBER
  • 4 POSTS
Po155, po154, po135 and po134.
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Sunday, March 3rd, 2019 AT 10:44 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Got it.

I attached two wiring diagrams for you to view for the O2 sensors.

Check the listed fuses for power on both sides.

Roy
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Sunday, March 3rd, 2019 AT 10:56 AM

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