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Those are the oxygen sensors in the exhaust above the catalytic converters.
On my 1998 Ford Expedition XLT , There are 4 Oxygen sensors. 1 each in front of the Cats. and 1 each behing the cat. for a total of 4 Oxygen Sensors.
Bank 1 is on the passenger side. Bank 2 is on the drivers side. The O2 sensors are screwed into the exhaust system. Follow the exhaust manifold rearward and you will find the O2 sensors.
Bank 1 is the same side as cylinder #1. Bank 2 would be the other side.
3, sensor 1 bank 1, sensor 2 bank 1, sensor 2 bank 2
There are 4 O2 sensors in 1999 suburban.Bank 1 sensor 1, bank 1 sensor 2 on the driver side before Catalytic Convertor. Bank 2 sensor 1 on exhaust Manifold, passenger side. Bank 1 sensor 3 is after catalytic convertor.
well bank 2 is passenger side of engine and sensor 2 is second one. 02 sensors on 2005 avanlache have 4 02 sensors 2 pre on bank 1 and 2 and have post on bank 1 and 2
Bank one is the same side of the engine as cylinder 1.
Bank 1 On the passanger side sensors Sensor2 the bottom O2 Post CAT sensor
1 is below the exaust manifold and 2 is in the exaust pipe
Bank 1 and Bank 2 sensor 1 (upstream) are usually the same. Sometimes the only difference is the length of the wire harness. Same goes for sensor B1 S2 and B2 S2 (downstream). It really depends on the vehicle. Some vehicles call them air/fuel sensors and they are all the same.
There are 4 O2 Sensors on the 1997 GMC Jimmy V6 4.3L. All sensors are accessed from bottom. All sensors are mounted on the exhaust. Three of the sensors are on the Bank 1 side of the engine (Passenger side). Sensor 1 Bank 1 is upstream of Y joint on Passenger Side, Sensor 1 Bank 2 is upstream of Y joint on drivers side. Sensor 2 Bank 1 is mounted down stream of Y before Cat Converter on Passenger side. Sensor 3 Bank 1 is downstream of Cat Converter on passenger side.