Bank one is on the side that the master cylinder is on bank two is the opposite side of the master cylinder
Bank 2 is the drivers side of the engine in a 2002 Mercury Mountaineer Sensor 2 is after the catalytic converter ( downstream )
Oxygen sensor. Bank 2 (front of motor) sensor 1 (sensor closest to exhaust manifold)
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
Trouble code P0161 means:O2 sensor heater circuit malfunction (Bank 2 Sensor 2)
On a 2002 Mercury Mountaineer ( V6 and V8 engines ) Bank 2 is the drivers side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter
Bank 1 is the passenger side of the engine in your Mercury Mountaineer Sensor 1 would be close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
left side of the engine after the cat
The oxygen sensor for bank 1 sensor 1 for a 2000 mercury mountaineer is on the cylinder #1 side.
On a Mercury Sable V6 engine : firewall 1-----2-----3 ( Bank 1 ) 4-----5-----6 ( Bank 2 ) front of vehicle > driver
Bank 2 is the drivers side of the engine in your Mercury Mountaineer Sensor 2 is in the exhaust after the catalytic converter
Bank One contains the No 1 cyl. Ford Taurus/Sable it is the rear bank cylinder on the passenger side with one, three and six cylinders. Front is Bank Two, cylinders 2,4, and 6. ========================================================== On a 2000 Mercury Sable , 3.0 L V6 ( Vulcan + Duratec ) firewall 1-----2-----3 ( Bank 1 ) 4-----5-----6 ( Bank 2 ) front of vehicle > driver
Bank two sensor two on a 2002 Ram is passenger side, after the catalyst.