Motorsport Electronics ME221 Plug and Play ECU For Mazda MX-5 NA NB

From: £694.99

3mm Silicone Vacuum Hose Pipe Tube Line (1m)

USB Cable 2m for Standalone Plug and Play ECUs

Eight Nine Molex Connector Kit for ME221 ME442

ME221 Plug and Play ECU For Mazda MX-5 NA NB

The ME221 MX-5 Plug-n-Play ECU is the latest plug-n-play Engine Management System for the Mazda MX-5 / Miata, years 1989/2005

It supports the 1.6 and 1.8 model, and also fits the OEM case, which means the conversion installs tidily into the OEM position. It also supports the stock ‘smart; alternator and closed loop VVT control.

The only extra thing you need to do besides plugging it in is run a MAP vacuum hose from the ECU to the intake manifold.

  • Uses the ME221 ECU Core (Freescale Automotive Processing Power)
  • Supports all factory sensors.
  • Truly Plug-n-Play
  • 16×16 Fuel and Ignition Tables (with dual table switching)
  • VE based fuelling algorithm.
  • Run any type of high impedance injectors.
  • DSP Knock Control
  • in-built 60psi/4Bar MAP sensor (or use your factory AFM)
  • Closed Loop Boost Control
  • Launch Control
  • In the field regular FW updates and improvements
  • Uses the powerful MEITE tuning studio.
  • An open approach to firmware/software features.
  • Supplied with rolling road certified and developed basemaps for either turbo or NA setups.
  • You will need to remove your factory ECU, and follow the hardware guide in the downloads section tab.
Package contents:
  • ME221 V2 PnP Core Board
  • USB Cable
  • Stickers
If you wish to run without a MAF sensor, then you will need to install an Intake Air Temperature Sensor – available in the options list.

Before plugging your ECU in for the first time, make sure you read though our quick start guide to property setup your ECU!

The latest news, software and guides can be found on our forum here:
*It is always recommended to seek professional advice when selecting an ECU, if you are working with a Tuner for your build our recommendation is to go with their preferred platform to get the best out of your build. It is possible to damage your engine with a poor tune, ensure you seek advice before pushing the limits of your engine.
Please note the image is for demonstration purposes only, the number of plugs on the ECU changes between engines and chassis

Additional information

Shipping Weight 0.685 kg
Shipping Dimensions 38.5 × 29 × 6 cm

Motorsport Electronics


NA 89-98 1.6 & 94-95 1.8, NA 96-98 1.8, NB 98-00, NB 01-05


Mk1 (89-98), Mk2 (98-05)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.

Make Model Year
Mazda MX-5 I (NA) 1989 - 1998
Mazda MX-5 II (NB) 1998 - 2005
Mazda MX-5 III (NC) 2005 - 2015
Mazda MX-5 IV (ND) 2015 - 2023