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View listing at Treasure Coast Miata; opens in a new tabMiata · Buyer's guide
NA/NB Miata Airflow Meters: NA AFM versus NB MAF
1990-1997 NA and 1999-2005 NB Miata stock intake metering. NA flapper AFM and NB hot-wire MAF families are electrically/mechanically different.
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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NA/NBSeller listing
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View listing at Walmart; opens in a new tabWhat you need to know
Check intake leaks, connector/wiring, airbox/tube, grounds and scan/voltage data. Do not use MAF cleaner on a flapper AFM or assume a harness adapter supplies correct ECU calibration.
OEM numbers
Checked 1990-1993 AFM B6S7-13-210Achecked 1994-1997 meter B6BF-13-215checked 2001-2005 MAF service example FS1E-13-215R00. Confirm installed label for every year.Supersession
No NA-to-NB chain exists. 1990-1993 flapper AFM, 1994-1997 meter and NB MAF/airbox calibration remain generation/ECU-specific.
Fitment
Check intake leaks, connector/wiring, airbox/tube, grounds and scan/voltage data. Do not use MAF cleaner on a flapper AFM or assume a harness adapter supplies correct ECU calibration.
Aftermarket options
New aftermarket and tested used meter paths exist. Modified intake/ECU conversions require a documented calibration and are outside stock direct replacement.
Before you buy
NA AFM and NB MAF systems are not interchangeable by connector appearance. Confirm year, engine, ECU, installed number and stock/modified intake; diagnose leaks and wiring before buying.
Research and fitment sources
Supersede reviewed 7 unique research sources for this guide. 4 also appear above as a seller or official action and are not repeated here; 3 additional citations follow.
Research last verified .