HIC-1 Replacement

Mirobuilds HIC-1 VR Conditioning Board Replacement – OBD1 Honda/Acura (1992–1995)

Solve CEL codes 4, 8, and 9 for good!

The factory HIC-1 VR conditioning board inside OBD1 Honda/Acura ECUs (P06, P28, P30, and similar models) is a common failure point. When this board fails, it can cause ignition problems and trigger check engine light codes for TDC (4), CKP (8), and CYP (9) — even if your distributor is functioning correctly.

This replacement board from Mirobuilds is built to identical specifications as the original “NY1-CG” board, ensuring a direct fit and restoring proper VR signal conditioning. Installing this board resolves signal issues and brings your ECU back to reliable operation.

Compatible With:

• 1992–1995 Honda/Acura OBD1 ECUs (P06, P28, P30, etc.)
• Direct replacement for HIC-1 (NY1-CG) boards

Symptoms Fixed:

• Check Engine Light codes 4, 8, 9 (TDC, CKP, CYP)
• Ignition misfires or no-start conditions caused by failed HIC-1 board

Disclaimer:
Professional installation is highly recommended. This part requires soldering and should only be installed by someone experienced in ECU repair or electronics. Incorrect installation can cause damage to the ECU.
Need help with installation? We also offer this as a service through our OBD1 Honda ECU Diagnostic Service.