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1996 Chevy S-10 Trouble code PO 133

Tiny
ROGER FORREST
  • MEMBER
  • 1996 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 22,800 MILES
Trouble code PO 133, "O2 circuit slow response, bank 1, sensor 1". There are three oxygen sensors on bank 1 before the cat converter. So where is sensor #1 located on the exhaust system?

Thanks, Roger Forrest
Monday, February 23rd, 2009 AT 3:49 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Bank 1 is always the head with the number 1 spark plug. The number 1 sensor is always in front of the catalytic converter (sensor closest to the motor). You can test each oxygen sensor before replacing them to ensure you are replacing the correct one. To learn how to check an oxygen sensor, follow the link below..

https://www.2carpros.com/how_to/how_to_test_oxygen_sensor.htm

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Tuesday, February 24th, 2009 AT 3:23 AM

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