Unleashing the Power of Diagnosis P0491 and Engine Performance Excellence

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 ... 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 ... SEL: P0491 Secondary Air Injection System Insufficient Flow General BMW Z4 Forum. p0491 | Watch the latest videos about #p0491 on TikTok. 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. Secondary AIR Diag VW Jetta P0491 part #1 part #2 https://youtu.be/GtQySXD7yPA?si=vWP3gwqqnzGvDV1i more diag tips for this problem before ... I did replace the #8 (second air valve) and #7 (the hose to the air pump). I am thinking buying the air pump. In your thread, you replaced the pump, was it ... 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 ... The error codes were a result of a bad combi-valve (which is similiar to an egr valve). Had to install parts 022-131-101-B (valve) & 078-131-120-K (gasket). Find out everything about the P0491 fault code In this video, we will explore the description, symptoms, causes, and solutions to resolve ...