Air Injection Check Valve ( 161606 or Chevrolet Trailblazer Air Fuel Ratio Sensor Manufacturer Part Number: E82017201CP Manufacturer Part Number: E82017201CP Manufacturer Part Number: E115732CP01 Please check the description and compatibility chart before your purchasing Fitment: 2004 2005 for Chevrolet Trailblazer LT Sport Utility 4 Door 2004 2005 for GMC Envoy SLE Sport Utility 4 Door 2004 2005 for GMC Envoy SLT Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer Base Sport Utility 4 Door 2004 2005 for Isuzu Ascender S Sport Utility 4 Door 2004 2005 for Buick Rainier CXL Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer A Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer B Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer LS Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer EXT B Sport Utility 4 Door 2004 2005 for Chevrolet Trailblazer EXT Sport Utility 4 Door 2004 2005 for Isuzu Ascender LS Sport Utility 4 Door 2004 2005 for Buick Rainier CXL Plus Sport Utility 4 Door 2005 2005 for Chevrolet Trailblazer Q Sport Utility 4 Door 2005 2005 for Chevrolet Trailblazer R Sport Utility 4 Door 2004 2004 for Isuzu Ascender Limited Sport Utility 4 Door 2005 2005 for Saab 9 7x Linear Sport Utility 4 Door 2004 2004 for Chevrolet Trailblazer North Face Sport Utility 4 Door 2004 2004 for Oldsmobile Bravada Base Sport Utility 4 Door 2005 2005 for Chevrolet Trailblazer EXT LS Sport Utility 4 Door 2005 2005 for Chevrolet Trailblazer EXT LT Sport Utility 4 Door 2005 2005 for GMC Envoy XL SLE Sport Utility 4 Door 2005 2005 for GMC Envoy XL SLT Sport Utility 4 Door 2005 2005 for GMC Envoy XUV SLE Sport Utility 4 Door 2005 2005 for GMC Envoy XUV SLT Sport Utility 4 Door