P0102 Nissan Altima
MAF Sensor Circuit Low Input · Powertrain Code · Medium · Repair: Easy
What is P0102?
The MAF sensor is reading below its expected range. Could indicate a dirty sensor, air leak, or wiring issue.
When the Nissan Altima triggers code P0102 (maf sensor circuit low input), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Altima.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Nissan Altima.
Common Causes on Nissan Altima
- Failed MAF sensor producing low signal voltage
- Disconnected or damaged MAF sensor connector
- Massive air leak downstream of the MAF sensor
- Corroded MAF sensor signal wires
Symptoms
- Check Engine Light on
- Engine runs very rich
- Black smoke from exhaust
- Poor acceleration
- Stalling
Notes for Nissan Altima
On Nissan vehicles, always check the intake air duct between the MAF and throttle body for cracks or loose clamps.