The O2 sensor is located on the air intake system. It connects the air filter box to the air intake manifold. It is the only peice on the air intake assembly that has an electrical connection (i.e. wires connect to it).
On your V6 engine : Bank 1 is the passenger side of the engine Sensor 1 is in the exhaust pipe ( or exhaust manifold ) before the exhaust enters the catalytic converter ( upstream )
in the exhaust pipes behind & in front of converters
Sensor one is in the exhaust manifold on the back of the engine. Sensor two is in the side of the catalytic converter.
On a 2000 Ford Ranger ( 3.0 and 4.0 litre V6 engines ) Bank 2 is the drivers side of the engine Sensor 1 is close to the engine ( it might even be in the outlet of the exhaust manifold ) BEFORE the exhaust enters the catalytic converter
The P0155 refers to the Oxygen sensor on Bank 2, sensor 1. Bank 2 on your vehicle is on the passenger side of the engine. Sensor 1 is the first oxygen sensor in the exhaust pipe coming from the engine.
it is on the engine near the rear above the block and next to the firewall
the oxygen sensor(sensors)
could be the oxygen sensor. that's what it was on mine.
yes
Before and after the catalytic converter
On a 2000 Ford Expedition ( 4.6 and 5.4 ) Bank 2 is the drivers side of the engine Sensor 1 is close to the engine BEFORE the exhaust enters the catalytic converter
Left side of car, first sensor towards the front.