Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner
po121
1-1 of 1 Results
  1. The 02-09 "How-To" and DIY Section
    I wanted to share some info on my successful fix for code PO121, indicating problems with the throttle position sensor. I followed Youtube instructions on removing, cleaning and replacing the throttle body. I was able to find just the sensor, part number 19-259-452. It was $43 delivered. Most...
1-1 of 1 Results
Top