P0491 Comprehensive Guide to Fuel System Diagnostics and Repair

2002 530i e39 - P0491 & P0492 Secondary Air Injection System (Bank 1 & 2) Emission rejected due to codes P0491 & P0492. P0491 and P0410 Codes Secondary Air Injection System ... Background on the car... 2007 Fusion w/ roughly 54k on the clock....no issues with the ... I have the infamous code P0491, and have been troubleshooting the secondary air pump system on my 02 M5. Took the cover off and verified the ... Hello Everyone, So I'm having this issue with makes my check engine to light up every now and then outputting this error code P0491 and ... I got the following two codes: The first one (store trouble codes) P0491 (secondary air injection system insufficient flow bank 1) I did ... The engine to shut off randomly while driving at lower speeds and at idle...it is intermittent...but usually shuts off within 10-20 mins of driving. Case #1: Audi · Check the vacuum element and flap in front of the intake manifold. · Inspect for leaks in the vacuum line. · Consider replacing ... P0491 code means there is a problem on the side of the engine which contains cylinder #1 due to a bad air inlet, faulty wires, relay, pump, or fuse. My VW CC 2010 is having a CEL with the code P0491 which means the pressure sensor is not detecting enough air being pumped from the intake into the exhaust. 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 ...