P0491 A Comprehensive Guide to Diagnosis and Repair

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 ... The air injection pump is failing or the fuse has blown. It's a high-current fuse (40A if I recall). For troubleshooting, I would look from the load side of ... That's a secondary air pump code. Either the pump is bad or the check valves are bad or there is a leak in one of the hoses. If there is a ... Code P0491 Secondary Air Injection System (Right Bank). Subscribe. Feb 3, 2006 | 10:03 PM. P0491 and P0492 indicate that you have insufficient air injection flow into the exhaust manifolds. The oxygen sensors are looking for a leaner ... 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 ... 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 ... I have a p0491 issue (Secondary Air Injection System Insufficient Flow Bank 1). Car runs fine, but I was curious about. I got the following two codes: The first one (store trouble codes) P0491 (secondary air injection system insufficient flow bank 1) I did ... The error codes were a result of a bad combi-valve (which is similiar to an egr valve). Had to install parts 022-131-101-B (valve) & 078-131-120-K (gasket).