Review on Denso-234-4368: High-Quality Black 🔌 Oxygen Sensor for Optimal Performance by Matthew Outlaw

an O2 sensor (lower rear / some call it rear rear). See the drawing/diagram I've attached here for the location of all 4 sensors on the V6. My average gas mileage went from 27mpg to 24mpg. Read a little and bought. This new O2 sensor returned my mileage but didn't clear the P0138 code, likely not the sensor's fault. I am in the process of further diagnosing this. Back to the fix, once I knew where the O2 sensor was, it took 30-60 minutes to fix. It took a while because the stock zip ties were difficult to get out in the tight spot under the car. I ended up just cutting the zip ties and reinstalling the new sensor without them. Comparison with OEM: Denso is slightly longer than OEM (see comparison in my picture, Denso below, out of order OEM). . My local Honda dealer wants to charge $250 for OEM part #36542-RKB-004 and $150 for labor. No thank you. If you're into OEM parts, you can find them online for around $140. Position: The position of the sensor in my 7th gen V6. Although it wasn't a post-cut like many people on YouTube claim, it was the very last sensor (of 4) and was in front of the firewall. I need access to it from both the top and bottom of the car. Also see the diagram/image in my review for the location of all 4 sensors. Select the correct Denso part: Check the part number: I originally bought the wrong Denso sensor #234-4355 which is downstream - front (or back to front). See my screenshot for your options. Go to their website and find the part number you need.