The code indicates that the exhaust gas temperature sensor on bank 1, sensor 1 is sending intermittent signals to the powertrain control module. This can affect emissions control and engine performance.
The sensor may have an internal open or short that causes intermittent voltage output.
Corrosion, broken wires, or loose pins in the sensor circuit can interrupt the signal.
Leaks can allow ambient air into the exhaust stream, altering the sensor's temperature reading.
A poor power supply or ground connection to the PCM may cause the sensor circuit to malfunction intermittently.
A rare failure inside the control module can cause intermittent signal processing, but this is usually the last suspect.
No, the PCM is rarely the cause; the sensor, wiring, or exhaust leak is far more likely.
Yes, carbon buildup or oil contamination can affect the sensor's response and lead to intermittent faults.
The vehicle may enter limp mode or experience reduced performance, so it should be diagnosed promptly.
Back-probe the sensor signal wire while the engine is running and compare the voltage to specifications.