P0491 Unleashing the Power of Diagnosis and Repair for Fuel System Excellence

Air injection errors usually point towards vacuum leak or a blockage. Vacuum leaks can be identified with a smoke tester and sometimes, build up in carbon can ... Code P0491 Secondary Air Injection System (Right Bank). Subscribe. Feb 3, 2006 | 10:03 PM. The PCM will set the 0491/0492 codes based on what the O2 sensors see. So if there is a link then perhaps the faulty PCV valve is changing the exhaust mixture. Secondary air injection is an emissions component on PZEV models that isn't related to engine operation - MAF not related at all. Electric air ... Note that the MAF sensor signal in the fresh air inlet stream has to be accurate. Also know that the air pump shouldn't shut off (stall) the ... Check the plumbing and make sure no air leaks are found in the thicker air pipes. ... anyway of nono of that is found all you have left is carbon ... Cold is a relative term. The engine coolant temperature needs to be under 104F/40C otherwise the SAP pump WILL NOT be commanded on. If you have ... P0491. Says its the secondary air injection system. I went to my friends shop here in pittsburgh to check it then we cleared it. Car is running fine but it may ... Secondary Air Injection System Insufficient Flow Bank 1. DTC P0491, sometimes indicated as P049100, is an OBD diagnostic trouble code indicating a generic fault ... What is Trouble Code P0491? OBD II Trouble Code P0491 indicates trouble with the Secondary Air Injection System. The components which make up the Air Injection ...