This diagnostic trouble code indicates the powertrain control module has detected an abnormal voltage or resistance value in the heating circuit of the nitrogen oxide sensor located on engine bank 2. The heater is responsible for bringing the sensor to operating temperature quickly, and this fault suggests it is not functioning within expected parameters.
The internal heating element within the sensor often fails due to extreme exhaust heat and age, causing resistance values to fall out of range.
Wires running close to hot exhaust parts can melt, chafe, or break, interrupting the heater circuit signal.
Exposure to moisture and road chemicals can cause corrosion at the plug, leading to poor electrical contact.
A short circuit in the wiring or sensor can cause the protective fuse to blow, cutting power to the heater.
Leaks upstream of the sensor can alter exhaust gas temperature and composition, confusing sensor readings.
Internal driver failure within the computer is possible but statistically rare compared to sensor or wiring faults.
It is generally safe to drive briefly, but prolonged operation may damage emissions equipment or trigger limp mode.
No, this code is almost always caused by the sensor or wiring, and replacing the PCM is rarely the correct fix.
Bank 2 refers to the side of the engine containing cylinder number 2, indicating which specific sensor is faulty.
No, the underlying electrical fault must be repaired or the code will return.