Decoding P0491 A Technical Guide for Experts

Ford Focus P0491 Trouble Code Repair Disclaimer: This video is not meant to be a definitive how to.Always consult a professional repair ... I bought this for my 2003 E46 BMW 325xi to fix the check engine light for code P0491 and P0492 which showed an error on the secondary air injection. Diagnose ... A quick global scan revealed the fault code P0491 for Secondary Air Injection System Bank 1, Insufficient Flow Short with Power – Intermittent. 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. Secondary AIR Diag VW Jetta P0491 part #1 part #2 https://youtu.be/GtQySXD7yPA?si=vWP3gwqqnzGvDV1i more diag tips for this problem before ... I got the following two codes: The first one (store trouble codes) P0491 (secondary air injection system insufficient flow bank 1) I did ... New article discussing fault codes P0491 P0492 on N62 V8 engine. Secondary Air Injection System Fault Codes P0491 P0492 BMW 5 Series 2004 ... It's code p0491 -- Secondary air pump, bank1. From what I've read it could be the bank 1 valve and/or the hoses that run under the manifold. 2002 530i e39 - P0491 & P0492 Secondary Air Injection System (Bank 1 & 2) Emission rejected due to codes P0491 & P0492. 2011 458, the CEL came on. I drive back home and hooked up my code reader, it showed a P0491 Secondary air injection system, Bank #1. Anybody have this problem?