Engine light turned on, code reader said o2 sensor

2003 CHEVROLET SUBURBAN
180,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
Avatar
RAVEN1936
  • MEMBER
  • 4 POSTS
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.
Mar 2, 2019 at 3:24 AM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good morning,

What were the exact codes?

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

Roy
Mar 2, 2019 at 4:41 AM
Avatar
RAVEN1936
  • MEMBER
  • 4 POSTS
Have also check fuse that's related to o2 sensor.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Mar 2, 2019 at 9:18 PM
Advertisement
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Got it. I need the code number.

Roy
Mar 2, 2019 at 9:56 PM
Avatar
RAVEN1936
  • MEMBER
  • 4 POSTS
Codes are in the pictures attached.
Mar 3, 2019 at 5:53 AM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Sorry, no pictures attached. Can you repost?

Roy
Mar 3, 2019 at 8:48 AM
Avatar
RAVEN1936
  • MEMBER
  • 4 POSTS
Po155, po154, po135 and po134.
Mar 3, 2019 at 10:44 AM
Avatar
ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 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
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Mar 3, 2019 at 10:56 AM