Maximize Fuel Efficiency Bank 2 Sensor 1 and Its Impact on MPG

Bank 1 is cylinders 1 to 3, so looking at the exhaust manifold, it is the pre-cat O2 sensor closest to the radiator. Bank 1 Sensor 1 = This O2 sensor is located right before the catalytic converter, on the side with the Cylinder #1 that is Bank 1. Bank 1 Sensor ... For my 2003 astro van , my scanner tells me that I have a heater failure in the #1 O2 sensor on Bank2 How does this work? We talking 02 sensors? Bank 1 is drivers side, Bank 2 is passenger side. Sensor 1 is precat, Sensor 2 is post cat. Locating Oxygen Sensors: Identifying Bank 1 Sensor 1 (Upstream) and Bank 2 Sensor 2 (Downstream) 28K views 1 year ago The post cat sensor (B2S2) is close to the firewall sticking up vertically. The pre-cat sensor (B2S1)is under the head angled slightly above the ... For sensor replacement, make sure to do both of them. O2 sensors are really wear items and have a lifespan of around 100-150K before they'll start getting lazy. Now I have a P0420 code that is sticking around, and unfortunately means that I probably need to replace the bank 1 cat. I've taken temperature ... when you installed it was the passenger side O2 sensor(behind the cat on the stock h-pipe) really close to the transmission? If so mine had the ... The O2 sensor location on the left (driver)side. The harness connector on top of engine you disconnect by hand by depressing a tab with fingers and unplug.