That is the O2 sensor on the passenger side at the manifold. Bank 2= side of #2 cylinder and sensor 1= first sensor back. I would first check if there is a bad connection. Reset the computer and see if the code comes back. The O2 sensor is around $60 at most part stores.
How do you unplug an oxygen sensor on a 2003 Chevy Cavalier
the lamba sensor is located inside the maifold
pass. side rear
driver side first o2 sensor
its connected to Muffler & Exhaust
Trouble code P0155 means: O2 Heater Circuit (Bank 2, Sensor 1)
It is the oxygen sensor.
Upstream, driver side.
The bank 1 oxygen sensor on a 2003 Ford Taurus is located on the motor. It is on the top, back part near the firewall.
Screwed into the exhaust system.
Under the steering wheel
The 2003 Mercury Grand Marquis came equipped with the 4. 6L V8. Oxygen (O2) sensor locations are upstream and downstream (before and after the catalytic converters).