It seems like this malfunction indicator light / check engine light problem may be an issue in terms of legally selling / installing your product in the USA (as an aftermarket add-on). I'm sure you know this already.
Quote:
Can the OBD system be repaired, deactivated, or modified?
The rule of thumb when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of tampering.
Likewise, overriding the OBD system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified "performance chips" or appropriate aftermarket parts.
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Source:
Frequent Questions | On-Board Diagnostics (OBD) | US EPA
I wonder if the EPA would consider this modification to be a "non-certified configuration".