Unlock the Mystery Diagnosing Bank 1 Sensor 1 O2 Sensor Issues

The O2 sensor is nothing to skimp on. I'm using the NTK sensor in my rig but the price is similar to the Denso brand. Buy YOUCANIC Pro Scanner https://www.youcanic.com/scanner/ Get Factory Service Repair Manuals & Specs https://www.youcanic.com/manuals Ask ... Bank 1 sensor 1 should be the O2 sensor on the exhaust before the catalytic converter. The O2 sensor after should be sensor 2. C63 AMG (W204) - Bad oxygen sensor bank 1, sensor 1??? - Car threw a check engine light and the error says o2 bank 1 sensor 1 is bad. The yellow line represents the route of the BANK 2 Sensor 1. The orange line represents the route of the BANK 1 Sensor 1. ... The Black loom is the Bank 1, grey ... I replaced Bank 1, Sensor 1 tonight as this was the one reporting a failure. It took 15 mins (if that). Firstly I removed the drivers side engine cover. Engine - Bank 1 Sensor 1 fault - few months back i replaced the upstream and downstream o2 sensors and my car was running a little jumpy but ... Easy to fix, but easier with the bumper removed first to get better access. You will also need a 22mm oxygen sensor socket to take it out & fit the new one. Change the sensor and clear the codes. Check for the B1S1 sensor to alternate up and down pretty regularly. B1S2 should be pretty steady indicating the cat is ... 450MV is the bias voltage the PCM supplies on the O2 signal terminal. When you unplug an O2 that is what a scanner will show.