Honda owners frequently lose keys or need replacement transponder chips. The Honda HDS software (especially v3.5 for older cars) allows you to program new keys to the Immobilizer system inside the ECU. Without this software, a locksmith or dealer charges $150-$300.
Specialized compatibility for Keihin ECUs commonly found in Honda motorcycles and automobiles. Recovery Tools: honda ecu 3.5 5.2 download