Bank 2 Sensor 1 The Ultimate Diagnostic Tool for Engine Health

SC430 - 2nd Gen (2001-2010) - O2 sensor Bank 2 Sensor 1 replacement help - Hi Guys, I've searched the forum for hours but can't seem to find ... Locating Oxygen Sensors: Identifying Bank 1 Sensor 1 (Upstream) and Bank 2 Sensor 2 (Downstream) 28K views 1 year ago Bank 2 Sensor 1 is located on the exhaust manifold directly behind the radiator. It's mounted about half way up the manifold, just under the point where the 3 ... A new tuner is looking over my logs and pointed out that my bank 1 02 is 10-12% higher (adding more fuel) then my bank 2 (1-3%). Mazda CX-9 - Where is Bank 2 Sensor 1 ? - Hi, Just got our CX-9 08 about a week ago and it has ran great. Yesterday the check engine light ... Bank 2 means that the O2 is sitting on the side of the engine that has the #2 cylinder. (Bank 1 would mean it's on the side of the #1 cylinder.). Bank 1 will be cylinder 1. Cylinder 1 is usually the furthest cylinder forward. Right hand side in a Ford, left hand in a Chevy etc. 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 ... Sensor 1 is always an upstream sensor. Bank 2 is the front bank (closest to the radiator), the sensor is in your face when you open the hood and look down. Use some pb blaster or wd40 and let it sit for at least an hour. I tend to use either a crescent wrench or some groove joint pliers, if I can get them in there.