33921-75HH / E6T18195H1 Mazda Spiano Engine Control Unit ECU.

Product Description
The Engine Control Unit (ECU) with part numbers 33921-75HH and E6T18195H1 is an OEM module designed for the Mazda Spiano (HF21S). This ECU regulates vital engine systems such as fuel injection, ignition timing, air/fuel mixture, idle speed control, emission functions, and on-board diagnostics.

Units are typically sourced as used or tested OEM originals. Prior to installation, it’s essential to verify pin configuration, software version, and compatibility with the vehicle’s immobilizer or key coding. Reprogramming or cloning may be required to fully match the ECU to your vehicle.

Compatibility Table

Vehicle Make	Model / Chassis	Engine	Year Range*	ECU Part Number	Notes
Mazda	Spiano (HF21S)	0.66 L / 1.0 L (kei class engine)	approx. mid-2000s onward	33921-75HH	Commonly listed in parts catalogs and used ECU listings (e.g. BeForward)
Mazda	Spiano	—	—	E6T18195H1	Alternative ECU designation used on some units

* Year ranges are approximate. Always verify with your vehicle’s original ECU and VIN details.

Compatibility Table

Vehicle Make	Model / Chassis	Engine	Year Range*	ECU Part Number	Notes
Mazda	Spiano (HF21S)	0.66 L / 1.0 L (kei class engine)	approx. mid-2000s onward	33921-75HH	Commonly listed in parts catalogs and used ECU listings (e.g. BeForward)
Mazda	Spiano	—	—	E6T18195H1	Alternative ECU designation used on some units

* Year ranges are approximate. Always verify with your vehicle’s original ECU and VIN details.

Shipping, returns and warranty

Worldwide shipping with tracking
30-day returns on unused, uninstalled parts
90-day limited warranty against defects

Send us your VIN and we confirm fitment before shipping. See our shipping policy and return policy.

33921-75HH

33921-75HH Mazda Spiano Engine Control Unit ECU E6T18195H1