Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
P0101-MAF Sensor Performance: Notes
- When Monitored : With the engine running and no fault in the throttle valve actuator.
- Set Condition : The Mass Air Flow (MAF) Sensor value is less than 16 kg/h when the throttle valve angle is greater than 14° for approximately 5 seconds, or the MAF Sensor reading is greater than a calculated value that is determined by engine speed and throttle valve angle for approximately 5 seconds.
| Possible Causes |
|---|
| FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN |
| FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND |
| SENSOR GROUND CIRCUIT OPEN |
| MASS AIR FLOW SENSOR SIGNAL CIRCUIT OPEN |
| MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORT TO GROUND |
| 5-VOLT SUPPLY CIRCUIT OPEN |
| 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND |
| MASS AIR FLOW SENSOR |
| POWERTRAIN CONTROL MODULE |
For a complete Powertrain Control Module Circuit Diagram, refer to SCHEMATICS AND DIAGRAMS .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.