Ford Focus RS / ST standalone ECUs
Ford's performance Focus hatchbacks, using the 2.5-litre five-cylinder turbo in the Mk2 and EcoBoost four-cylinder engines in the Mk3.
- Chassis
- Mk2 · Mk3
- Years
- 2005–2019
- Engines
- 2.3 EcoBoost · JZDA 2.5T Duratec · HYDA 2.5T Duratec · 2.5T Duratec · 2.0 EcoBoost
- Layout
- 4 or 5-cylinder, FWD
You have 7 plug-in ECU options for the Ford Focus RS / ST from MoTeC, MaxxECU, ECUMaster and Syvecs, 3 of them direct plug-in. The cheapest complete setup is MaxxECU at US$1,958 including the ECU. 55 wire-in ECUs can also run its 4 or 5-cylinder engine with a custom loom, from US$275.
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$4,188 →
Standalone + adapter harness 4
A general-purpose ECU with an off-the-shelf harness that joins it to the factory ECU plug.
From US$1,958 →
Wire-in ECU 55
Any ECU with the right features, on a new or rewired loom. Best for race cars, swaps and big changes from factory.
From US$275 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 Ford Focus RS / ST
7 options, cheapest first. Each one links to its full specs and sellers.
Ford Focus RS/ST (2009-2010 MaxxECU RACE H2O Plugin STANDARD
Kit: MaxxECU unit + plug-in adapter, no wideband sensor (STANDARD)
MaxxECU RACE adapter harness Ford Focus RS 2010 (ME 9.0)
Adapter harness only; MaxxECU unit sold separately
2016-19 Ford Focus RS PNP Kit
MoTeC USA kit (not on motec.com.au targeted list); Integration patch harness
EMU interconnector (Focus RS / ST)
Listed as available interconnector on ecumaster.com; no US store listing found
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 5 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: MoTeC · MaxxECU · ECUMaster · Syvecs