Conquer P0491 Master the Secondary Air Injection System

If the PCM detects that the catalytic converter is not being heated up sufficiently to become self-sustaining in the period specified by the ... 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. S-Type / S type R Supercharged V8 ( X200 ) - P0491...secondary air pump? - I just scanned my car for a CEL and came up with this code. It's not serious. Secondary air injection is used to warm up the catalytic converters during a cold start. You'll have to get it diagnosed to ... A quick global scan revealed the fault code P0491 for Secondary Air Injection System Bank 1, Insufficient Flow Short with Power – Intermittent. 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 ... The OBD-II fault code P0491 means that the Secondary Air Injection System is not providing enough airflow into the exhaust system during ... The error code P0491 can be defined as Secondary Air Injection System Insufficient Flow Bank 1. This trouble code indicates that there is an issue on the side ... This code comes back and I have to remove it to turn off the check engine light. I have been told I need a carbon cleaning and Audi will not honor an extended ... If you're seeing this code, it means the powertrain control module (PCM) has identified that the SAI system is dealing with insufficient flow.