MAF Sensor In Range But Lower Than Expected
Your Mass Air Flow (MAF) sensor is reading lower than expected, meaning the engine thinks less air is entering than it should for the current conditions. It's like a water meter that's underreporting flow even though the faucet is wide open.
The ECU monitors MAF sensor voltage signals to calculate air mass entering the engine and adjusts fuel injection accordingly. When voltage falls below the expected threshold for current engine load and RPM, the fault triggers. The ECU expects a specific voltage range based on throttle position, RPM, and intake air temperature.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| MAF Sensor Voltage | 1.0–5.0 V (varies by load) | Below expected voltage for current conditions |
| Calculated Air Mass | Matches load demands | Reading consistently lower than predicted model |
Code P1107 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1107 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.