P0491 A Diagnostic Guide to Resolving Secondary Air Injection System Malfunctions

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. It was running like a dream, but recently threw a code. P0491. I checked the code and it's the secondary air Injection. I have had the hardest ... 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 ... Here is the schematic for an 03 manual: There should not be a vacuum line running back to the transmission area, if it is open you have a vacuum leak which can ... Both of these codes are pointing towards a defective valve. Tests/Procedures:1. This system uses a pressure sensor to monitor secondary Air Flow from the AIR ... p0491 | Watch the latest videos about #p0491 on TikTok. Bank 1 is the drivers side, check the fuses for the secondary air injection pumps. There are two 40a maxi fuses located in the underhood fuse ... Error code P0491 which to my understanding is related to the secondary air injection system on bank 1(whatever it means, I guess cylinder 1) i might try to see if my MAF is dirty... this is the best info i think i have recieved yet. ... period during which the AIR pump is energized is ... A quick global scan revealed the fault code P0491 for Secondary Air Injection System Bank 1, Insufficient Flow Short with Power – Intermittent.