Review on 🔍 Enhanced Search-Optimized Delphi ES20094 Oxygen Sensor by James Pfettscher

Many parts manufacturers and even this listing on Revain list this O2 sensor with a blue square connector as the only one for a 2003 Hummer H2, but my 2003 Hummer H2 uses the same sensor as listed. for Hummer H2 2004; Look at the picture (provided by me - click on the photo) and pay attention to the trapezoidal surface of the sensor. This trapezoidal area sensor is for the first row (driver's side), the first sensor (upstream/before the catalyst) AND for the second row, sensor #1. Square area sensors are ONLY used for sensors #2 (neutralizers). And YES, they work perfectly!