In most applications the the #2 O2 sensor is the one downstream. Imagine your exhaust is a river flowing and the downstream thing makes more sense. Most inline engines only have two o2s, and the one behind the catalytic converter is #2. In V configurations there is the added distinction of bank 1 and bank 2. This refers to each side of the motor and varies with each manufacturer as to which one is which. As for fixing it, assuming the problem is a worn out sensor and not a wiring problem, replace it. They are solid-state non-serviceable parts and there ain't nothing you can do to get it working again. Bear in mind that all the sensors in the exhaust system have experienced the exact same conditions and should be replaced when one fails - ideally. Practicality and $ often dictate that only the dead one gets replaced. Depending one the programming in your vehicle, you may need to reset the adaptive fuel trim after replacing the O2, call your friendly neighborhood dealer for specifics on your particular vehicle. A little heat will help unstick any siezed sensors, get the boss in the pipe where it screws in red hot and it'll come out like butter. Watch for fuel leaks und the car BEFORE lighting the torch or the dead sensor may no longer be the cars biggest issue.
Replace it. Sensor 2 is the one AFTER the catalytic converter.
DTC P0141 is: Oxygen Sensor Heater Cuircuit Malfunction (Bank 1 Sensor 2). The Downstream O2 Sensor(aft of the Catalytic Converter) most probably need to be changed.....
Bank 2 sensor 1 is the O2 sensor in the exhaust manifold closest to the firewall.Cut and paste the link below for a detailed fix with pics of the O2 sensor repair."http://polifrogblog.blogspot.com/2009/11/sienna-o2-sensor-change.html"
If you have an oxygen sensor problem then there should be a check engine light "on." Have a repair shop scan and diagnosis the problem. You may not truly have a problem with the oxygen sensor as it could be a vacuum leak that makes the o2 sensor set a code.
ho2s12 heater condition ( heated oxygen sensor) O2 sensor located in the middle. senosor #2 not to be confused with "air fuel ratio sensor" as most mechanics will confuse them at times and not fix your lights on dash wich can be annoying.
P0135 on Mitsubishi galant 2003 Definition: HO2S 11 Heater condition (Heated Oxygen Sensor Bank 1 Sensor 1) Explanation: The powertrain control module monitors the oxygen sensor heater. The computer has recognized a failure in this ciricuit. Probable Causes 1. -Oxygen sensor defective 2. -Poor connection at oxygen sensor 3. -Check circuit-fuse
Bank 2 sensor 2 refers to the oxygen sensor on the passenger side of the exhaust system and after the catalytic converter. heater circuit is the oxygen sensor or the wiring going to it, it is what is called a heated oxygen sensor. Google image search oxygen sensor and that is what it looks like, and they can be a bear to get out.
The oxygen sensor bank 1 is located in the exhaust manifold. The oxygen sensor bank 2 on the 1996 BMW 328is is located in the head pipe.
Bank 2 Sensor 2 is passanger side after cat.
its located in the back of the motor.
pass. side rear
Bank 2 is on the passenger side of the vehicle. Sensor 2 is down stream ( behind ) the catalytic converter. Second sensor from the manifold. May have 4 sensors.