P0102 on a Nissan Altima
P0102 means mass Air Flow (MAF) Circuit Low Input. On the Altima, a few causes come up far more than others.
What P0102 usually means on a Altima
P0102 means the Altima's mass-airflow sensor is reporting an abnormally low signal, and Nissan MAF sensors are a well-known weak point across these engines. A dirty or failing MAF throws off the air measurement, causing hesitation, stalling, or poor economy. It often pairs with lean or rich fuel-trim codes. Cleaning the sensor can help, but a drifting MAF frequently needs replacement.
Most common causes on the Altima
- Dirty or failed MAF sensor
Nissan MAF sensors commonly contaminate or drift, reading low and setting P0102.
- Intake leak before the MAF
Unmetered air or a loose air-box connection skews the signal.
- Wiring or connector fault
A corroded MAF connector drops the circuit low.
- Restricted air filter
A heavily clogged filter reduces measured airflow.
What P0102 costs to fix on a Altima
Try cleaning the MAF with proper sensor cleaner first - nearly free and sometimes sufficient. A replacement MAF is a moderate Nissan part and a quick swap. Check the air-box connection and connector before spending, since a simple intake leak can mimic a bad sensor.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Nissan Altima
Nissan Altima problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0102 behavior is covered on the main P0102 page. Confirm with a scan tool before buying parts.
P0102 on your Altima?
Every problem becomes a Case. Tell Redline what your Altima is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.