2003 Nissan Altima

On certain vehicles equipped with the 2.5 liter engine, the exhaust pipe hanger pin may catch debris from the road which could be ignited by contact with the main catalyst. Correction: Dealer will remove the protruding portion of the exhaust pipe hanger pin. Also, certain operating conditions may cause the pre-catalyst to overheat and damage the catalyst substrate. If substrate particles enter the combustion chamber, they may score the cylinder walls, resulting in increased oil consumption. If the engine oil level is not checked on a periodic basis, engine damage may occur which could result in fire. Correction: Dealer will reprogram the engine control unit to prevent the possibility of the pre-catalyst overheating. If the conversion efficiency of the pre-catalyst has deteriorated, then the catalyst will be replaced. The original pre-catalyst will then be inspected for evidence of damage to the catalyst substrate. If damage is present, the vehicle engine will be replaced.