Bank 1 Sensor 1 The Game-Changer for Engine Monitoring and Optimization

Bank 1 is where cylinder #1 is located, so on the 3.3 rear of engine closest to the firewall. Sensor 1 is the upstream O2 sensor before the cat. The "sensor 1" should refer to your upstream sensor, generally placed very close to the engine (make sure you ordered that and not your downstream sensor that ... if you have a 4 cylinder there is only 2 O2 sensors. ... sensor 2 is after cat. ... Now if you had a V6 or V8 bank 1 is the left side of engine ... The bank 1 sensor 1 oxygen sensor is the first sensor in your exhaust after the engine. It is before the catalytic converter. Oxygen Sensor Location Bank & Sensor 1 and 2. 24K views · 1 year ago ...more. YOUCANIC. 67.9K. Subscribe. 77. Share. The primary sensor is screwed into the exhaust manifold downstream of the 4-1 collector. The secondary sensor is screwed into the converter. My research says bank 1 is on the passenger side of the truck and sensor 1 is pre cat. I've also read it should be near the exhaust manifold and ... Bank 1 always means head 1. Bank 2 will mean head 2 on a V or boxster engine. Since you only have 1 head, you'll always see bank 1 codes. 2008 - 2011 Avalon 2GRFE 3.5L. 2008 - 2011 Camry 2GRFE 3.5L. These are the genuine Toyota Bank 1 Sensor 1 for the following Toyota Models You are purchasing ... The service manual's sole diagnostic procedure for P0133 is check bank 1 sensor 1, so you have chosen the correct diagnostic path.