Mazda MX-5 Miata standalone ECUs
Mazda's lightweight rear-wheel-drive two-seat roadster, launched in 1989 and built across the NA, NB, NC and ND generations.
- Chassis
- NA · NB1 · NB2 · NC
- Years
- 1989–2015
- Engines
- B6ZE 1.6L · BP 1.8L · BP-Z3 1.8L VVT · BP 1.8L turbo (non-VVT) · BP 1.8L (non-VVT) · 1.8L BP (VCT / factory turbo SE / Mazdaspeed)
- Layout
- 4-cylinder, RWD
You have 14 plug-in ECU options for the Mazda MX-5 Miata from Link, Haltech, ECUMaster and rusEFI, 3 of them direct plug-in. The cheapest complete setup is rusEFI at US$460 including the ECU. 63 wire-in ECUs can also run its 4-cylinder engine with a custom loom, from US$155.
Prices checked and include the ECU.
Your options for this car
New to this? Three ways to fit an aftermarket ECU explains each one in five minutes.
Dedicated plug-in 3
Built for this car. Goes where the factory ECU was and plugs straight into the factory loom.
From US$1,475 →
Standalone + adapter harness 11
A general-purpose ECU with an off-the-shelf harness that joins it to the factory ECU plug.
From US$460 →
Wire-in ECU 63
Any ECU with the right features, on a new or rewired loom. Best for race cars, swaps and big changes from factory.
From US$155 plus loom →
Reflash
Keep the factory ECU and rewrite its tune. Usually the cheapest, keeps every factory feature, but limited to what the factory hardware can control.
Reflash options for this car are still being checked.
Plug-in ECUs for the Mazda MX-5 Miata
14 options, cheapest first. Each one links to its full specs and sellers.
Mazda MX-5 / Miata NC 120-pin Superseal Adapter
OEM-connector to 60/26-pin Superseal adapter board for a Superseal-connector rusEFI ECU (ECU not included); listed as not yet tested on a vehicle
1999-2000 Mazda Miata NB1 PNP for EMU Classic
Manual trans; A/C, alternator control retained
MX5NAX Plug-In ECU (Mazda MX-5 NA, 1600-1800)
Manual only; onboard MAP; E-throttle needs modification
MX5NB1X Plug-In ECU (Mazda MX-5 NB1)
3-plug ECU; manual only; onboard MAP; E-throttle needs expansion connector
MX5NB2X Plug-In ECU (Mazda MX-5 NB2)
Manual only; onboard MAP; E-throttle needs expansion connector
HT-150621 Elite 750 + Mazda Miata (MX-5) NB Plug'n'Play Adaptor Harness Kit
3-plug 3-row ECU; manual only
HT-150622 Elite 750 + Mazda Miata (MX-5) NA Plug'n'Play Adaptor Harness Kit
2-plug ECU; manual only; not USDM OBDII 96-97
HT-150921 Elite 1500 + Mazda Miata (MX-5) NB Plug'n'Play Adaptor Harness Kit
3-plug 3-row ECU; manual only
HT-150922 Elite 1500 + Mazda Miata (MX-5) NA Plug'n'Play Adaptor Harness Kit
2-plug ECU; manual only; not USDM OBDII 96-97
HT-212316 Nexus S2 Plug 'n' Play Adapter Harness Kit - Mazda MX5 NA
2-plug ECU; manual; not USDM OBDII 96-97
HT-213316 Nexus S3 Plug 'n' Play Adapter Harness Kit - Mazda MX5 NA
2-plug ECU; manual; not USDM OBDII 96-97
No plug-in is listed for that chassis and year. A wire-in ECU below will still fit with a custom loom.
Wire-in ECUs that can run this engine
Cheapest current unit from each brand with at least 4 injector and ignition outputs, so it runs fully sequential.
Add a loom: built by your tuner or a loom maker. Filter every wire-in ECU by features and price
Find a tuner for these ECUs
Shops with their own dyno that tune the brands above.
About the makers: Link · Haltech · ECUMaster · rusEFI