Review on 🚗 Enhance Your Vehicle's Performance with Denso 234-4700 Oxygen Sensor by Adam Aponte

Bought a pair of these for my 2003 Infiniti QX4 (aka Pathfinder) to use in the low position. Received codes P0138 and P0158. The same piece fits right and left. I figured it would be easier to strip and crimp the wires than to reroute the stock wires. Well yes and no. You can drive QX4 or Pathy without lifting the car (please apply the brake). And I was able to easily pull the 171,000 mile originals off by pretreating them with penetrating oil the day before and tapping my O2 sensor key (short, offset) a few times. Once they're disabled, cut the wires right at the (old!) sensor. You have enough OEM cables left over to neatly connect and get the cables out of the way. The sensors come with copper type anti-seize paste and little butt connectors that form a neat little bundle of wires. They also come with heat shrink but oddly it's too small. When purchasing an O2 wrench, purchase a shrink tubing kit from a tool store in China. Then you have a large tube to wrap the entire bundle. Yes, and a heat gun would be nice. But the most important thing is a quality wire stripper. Because all of those wires are Teflon coated and you're going to mutilate them with ordinary wire strippers. You want a type that grips the wire and has slots for different size wires to separate them cleanly. Use a 20-22 gauge slot. You really only need 1/4 inch. Now it's time to crimp. Slide a large sleeve over the entire bundle and a length of HS tubing over each butt connector. Place the butt connector in the crimping tool and then connect it to the wire. It's not easy out there and requires a firm hand. Repeat for all 16 connections (2 probes, 4 wires, 2 ends). Put on the small individual HS tubes and boil them first. Wait for it to cool, slide the big sleeve and shrink it too. Tie them together with a tie so they don't get in the way of hot and rotating objects. Here's the tip of the day: Pathfinder / QX4 New sensor function white black heater white black heater black blue signal + gray white signal - the heater circuit with black and white was easy to remember, but the signal line confused me (black is a plus ?), so all I remembered was "black and blue" when I was there. The left grey-white, the signal returned to full. They say they use Denso on Japanese cars and my QX4 was built in Japan. I cleared my codes and within three days all the OBD2 monitors were ready and I passed the smog test with flying colours. I hope yours too.