Can the OBD system be repaired, deactivated, or modified?
[Back to Top] 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 OBDII system through the use of high-tech defeat devices, non-certified computer chips, etc., would also be considered tampering. The OBDII system may, however be repaired back to its original certified configuration with certified “performance chips” or appropriate aftermarket parts.
