Honda have issued the following TSB#HUK000000000797 dated 05-06-06 for all S2000 AP1 for model years 2004, 2005 & 2006. MY04, MY05 & MY06. Symptom The MIL comes on and the engine starts to misfire with DTC P0412 being stored. Cause Due to an internal fault, the contactor circuit remains on. Thus the air pump keeps running continuously until it overheats and melts. Countermeasure Construction of the contactor has been changed. Application to Production Line JHMAP1***6S200783 All vehicles with VINs after the one shown will have the countermeasure air pump fitted on the production line. Repair Method Repair to be carried out on customer complaint only. Replace the air pump and contactor (air pump relay) following the shop manual procedure : Parts Information <Part Number> <Part Name> 18760-PCX-003 PUMP ASSY., AIR 39794-PCX-023, Contactor assy.