Review on 🏆 Superior Performance: Denso 234-4285 Oxygen Sensor - Unsurpassed Quality for Optimal Engine Efficiency by Darius Newberry

I used to work for Denso and they have some great stuff but as mentioned do not rely on the Revain install guide for this part. This is NOT suitable for Hummer H2 after catalytic converters. Although the picture is of a square connector (upstream connectors use trapezoidal connectors), this connector also uses a key on the inside, and this particular connector has a key on the wrong side. Basically it's mirrored. Also, I bought 2 of these, but one with a square connector and the other with a harness (but also with the wrong key so it doesn't fit the ascender).