P0104 indicates the engine control module detects an irregular or intermittent signal from the Mass Air Flow (MAF) sensor circuit. This means the sensor data is fluctuating unexpectedly rather than being completely absent or fixed at a single value. It often points to electrical connection issues, wiring problems, or a failing sensor element.
Internal electrical fault within the sensor causes signal drops or erratic voltage output.
Chafed, broken, or exposed wires in the sensor circuit lead to intermittent connection loss.
Poor contact or oxidation at the sensor electrical plug disrupts signal transmission.
Contamination on the sensing wire disrupts airflow measurement consistency.
Unmetered air enters the engine between the sensor and throttle body.
Internal control module fault preventing signal processing is very rare.
No, PCM failure is extremely rare for this code; check wiring and the sensor first.
Cleaning may help if dirt is the cause, but internal electrical faults require replacement.
Short trips are usually okay, but prolonged driving may harm fuel economy and performance.
Intermittent codes trigger when the fault happens temporarily, often due to vibration or heat.