Honda Civic standalone ECUs
Honda's front-wheel-drive compact, tuned across many generations with D-, B- and K-series four-cylinder engines.
- Chassis
- Gen 5 to Gen 11 (EG/EH, EK, EP3, EM2/ES, FN2, FD2, FK2, FK8, FL5)
- Years
- 1990–on
- Engines
- D/B-series OBD1 · D/B-series OBD2 · K20A · K20A3 · D17A1/A2/A3 · B-series
- Layout
- 4-cylinder, FWD
You have 19 plug-in ECU options for the Honda Civic from Link, Haltech, MoTeC, ECUMaster, Syvecs, AEM and rusEFI, 8 of them direct plug-in. The cheapest complete setup is rusEFI at US$850 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 8
Built for this car. Goes where the factory ECU was and plugs straight into the factory loom.
From US$850 →
Standalone + adapter harness 11
A general-purpose ECU with an off-the-shelf harness that joins it to the factory ECU plug.
From US$1,488 →
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 Honda Civic
19 options, cheapest first. Each one links to its full specs and sellers.
Honda K (2002 pinout)
On-board wideband (LSU 4.9 not incl.), coolant gauge via K-line; years from common EP3/RSX ranges, not stated on listing
HC92X Plug-In ECU (Honda Civic 1992-95, Gen 5)
DX/LX/EX/Si; OBD1 ECU; manual only; no knock control; E-throttle needs modification
HC96X Plug-In ECU (Honda Civic 1996-98, Gen 6)
DX/LX/EX/Si; Link lists Civic 1999-2000; title says 1996-98; Manual only; E-throttle needs modification
AEM Infinity-6 506 EMS 92-95 Honda Acura OBD1 B D H Series With PNP Harness (30-7106/30-3501)
discontinued; Manual trans; harness 30-3501, coil adapter 30-3501-00
K20X Plug-In ECU (Honda DC5/RSX K20)
Manual only; onboard MAP; E-throttle needs expansion connector
HT-150939 Elite 1500 + Honda OBD-I B-Series Plug 'n' Play Adaptor Harness Kit
OBD-I B-series; Manual only
HT-150960 Elite 1500 + Honda Civic EP3 Plug 'n' Play Adaptor Harness Kit
Manual only; no multiplexed temp gauge/battery light/AC request
HT-212300 Nexus S2 Plug 'n' Play Adapter Harness Kit - Honda OBD-I
OBD-I B-series; Manual only
HT-213300 Nexus S3 Plug 'n' Play Adapter Harness Kit - Honda OBD-I
OBD-I B-series; Manual only
Syvecs Honda Type R FN2 / FD2 (2007/2014) – S7Plus Plug in ECU
Magnus variation names FD2; FN2 assumed same kit
Honda Civic FK8R 2017 M1 Kit (#11426)
M142 + adaptor box + stub looms + LTC; manual; paddle-shift package 23421 available
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 · MoTeC · ECUMaster · Syvecs · AEM · rusEFI