Bank 2 Sensor 1 Heater circuit Failure?

You get check engine light on dash.In this case Engine computer module called ECM has to be scanned.
In scanning you get error code P0155.
This error code means.Bank 2 Sensor 1 heater failure.
This refers to the heater inside one of your oxygen sensors. The computer is not reading current to the heater. The problem may be the wires or the sensor itself. The thing to do is to check for voltage at the sensor connector with the key turned on. This particular sensor is right on the front of the engine by the radiator. If the voltage is there, the sensor is probably bad. You can also test the sensor heater with an ohmmeter as follows:
Testing Heating Element
Before Testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged.
Disconnect the electrical harness from each of the sensors.
The white wires in the sensor connector are the power and ground circuits for the heater.
Connect the ohmmeter test leads to the terminals of the white wires in the heated oxygen sensor connector.
Check the resistance of the sensor, if it is not within 4-7 ohms, replace the sensor.
The picture below is the sensor on bank 1, by the firewall. The one you want (bank 2, sensor 1) is on the front of the engine.

See the Sample diagram shown below :----

This details will help you.

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