Empowering You with Knowledge Understanding P0491

Ford Focus P0491 Trouble Code Repair Disclaimer: This video is not meant to be a definitive how to.Always consult a professional repair ... I have a p0491 issue (Secondary Air Injection System Insufficient Flow Bank 1). Car runs fine, but I was curious about. 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 ... Secondary AIR Diag VW Jetta P0491 part #1 part #2 https://youtu.be/GtQySXD7yPA?si=vWP3gwqqnzGvDV1i more diag tips for this problem before ... Secondary Air Injection System Insufficient Flow Bank 1. DTC P0491, sometimes indicated as P049100, is an OBD diagnostic trouble code indicating a generic fault ... Discover what a P0491 code means for your Volkswagen and how to troubleshoot related Service Bulletins. Learn the causes, symptoms, ... SEL: P0491 Secondary Air Injection System Insufficient Flow General BMW Z4 Forum. 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 ... 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. The data shows there is no air mass moving across the sensor when system testing is activated. Whether that means the sensor is crap or the valve is stuck ...