P0102: Mass airflow sensor circuit signal too low
Drive carefully. Get it checked within a week or two.
Can I drive with P0102?
Yes, but drive carefully and get it checked soon. The sensor reports almost no air entering, forcing the engine into a rich limp-home mode.
What does P0102 mean?
P0102 stands for Mass or Volume Air Flow Circuit Low Input.
Symptoms you may notice
- Engine hesitates or jerks when stepping on the gas
- Rough, unsteady idle at stoplights
- Reduced engine power and delayed gear shifts
How much does it cost to fix?
Repair costs for code P0102 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Unplugged or damaged MAF wiring
- Heavily fouled or failed MAF sensor
- Blown engine management fuse
- Severe intake air duct detachment
What to do next
- Verify the wiring harness connector is locked into the sensor.
- Check the engine bay fuse box for blown sensor fuses.
- Measure reference voltage at the harness with a multimeter.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
P0102 means the voltage signal returned by the MAF sensor drops below the minimum threshold (typically under 0.2 volts). This leaves the computer blind to incoming air, prompting hard starting, stalling at stoplights, and poor engine power. Prompt diagnosis prevents raw fuel from washing cylinder walls or overheating the exhaust catalyst.