Review on Optimize your vehicle's performance with the Denso 234-4169 Oxygen Sensor by Brian Wesley

Car had decent mpg but not as good as it could be. The originals had 200,000 miles (factory interval 100,000), although the mechanic said they should change the trouble code. I didn't like this advice, so I replaced them because several full tanks of gas pay for these sensors. After replacing the MPG when driving on the road, consumption increased by 2 MPG. Remember to put some copper grease on the threads to lubricate the threads. Just a thin layer. Some videos on YouTube smear stuff and it's not necessary. The cost through Revain is much better than the retail price of $115 each. There was no problem removing or installing them with a box wrench. Bovidix 0681922 Open-end Wrench Metric - 19 x 22mm