P0491 Empowering You with the Knowledge to Diagnose and Repair Emissions Issues

I'm getting code P0491–Secondary Air Injection System Insufficient Flow Bank 1. I've cleared it twice and it keeps coming back. Does anyone know ... And this video will be diagnosing a p0491 secondary air injection low-flow on this Volkswagen Passat with a 2.5 L engine. Air injection errors usually point towards vacuum leak or a blockage. Vacuum leaks can be identified with a smoke tester and sometimes, build up in carbon can ... P0491 stands for “Secondary Air Injection Insufficient Flow Bank 1.” It is logged once the vehicle's powertrain control module (PCM) perceives that there is a ... The P0491 code tell there is a fault with the system – usually that the secondary air flow is too low on bank 1. In this video, I will show you how to fix BMW the air injection codes p0491 and P0492. P0492: Secondary Air Injection System Insufficient ... Note that the MAF sensor signal in the fresh air inlet stream has to be accurate. Also know that the air pump shouldn't shut off (stall) the ... What is Trouble Code P0491? OBD II Trouble Code P0491 indicates trouble with the Secondary Air Injection System. The components which make up the Air Injection ... Sounds like a carbon build up issue in which case the car is safe to drive. You may have a problem when you come to your next emissions test but you can fix it ... 2002 530i e39 - P0491 & P0492 Secondary Air Injection System (Bank 1 & 2) Emission rejected due to codes P0491 & P0492.