What is SPN 101 FMI 16:
SPN 101 is the Mass Air Flow (MAF) Sensor, and FMI 16 indicates a signal or performance degradation over time.
This typically results in incorrect airflow data reaching the ECM, causing poor fuel/air balance.
Why This Happens
- Sensor is dirty or degraded.
- Air filter restriction or oil contamination.
- Loose or cracked intake piping.
- ECM software not processing values correctly.
How to Fix It
- Inspect and clean the MAF sensor.
- Replace the air filter if overdue.
- Repair any intake leaks.
- Replace the sensor if values remain unstable.
- Clear the code and test fuel trims.
How to Avoid It Before It Happens
- Clean MAF sensors regularly.
- Use dry air filters instead of oiled filters.
- Log airflow vs boost pressure weekly.
- Use Clue’s Preventive Maintenance to schedule regular MAF sensor cleanings and air filter replacements to maintain optimal airflow and ECM performance.