The P2205 code indicates that the heater circuit for the first exhaust NOx sensor on Bank 1 is open, meaning the sensor's heating element is not receiving proper voltage or has a break in the circuit.
The sensor's internal heating element can degrade or short open over time, interrupting the heater circuit.
Wiring harness between the sensor and PCM may be broken, corroded, or have a loose connector.
A blown fuse or malfunctioning relay in the heater power supply can cut power to the sensor heater.
The PCM's driver circuit that supplies heater voltage may fail, but this is less common than sensor or wiring issues.
No. The PCM is rarely the cause; most often the sensor heater, wiring, or a blown fuse is at fault, so those components should be checked first.
The NOx sensor itself usually does not trigger P2205; the code specifically relates to the heater circuit, so a failed heater element or its wiring is the typical culprit.
Not directly; the code affects emissions control, but an open heater circuit can cause the engine to run richer temporarily, which may slightly impact fuel consumption.
Driving with the code is possible for a short period, but prolonged operation may lead to higher emissions, reduced performance, and potential failure of emissions testing.