Secondary air system bank 1 bmw. Bank 1 refers to the side of the engine where cylinder #1 is located. So after soaking with Seafoam and pushing my rifle bore cleaner through, this is the best I could get bank 2. com In this video, I will show you how to fix BMW the air injection codes p0491 and P0492. . ” This code is logged once the PCM determines that the secondary air flow in bank 1 is too low. what tool are you using to get in there? Rifle bore cleaner. The P0491 code for BMW vehicles indicates a problem with the AIR (Secondary Air Injection) system, specifically an insufficient flow detected in Bank 1. One common problem that BMW drivers may face is the P1421 diagnostic trouble code (DTC), which relates to the secondary air system bank 1. If you’re experiencing this issue, you may be wondering what it means and how to fix it. Sep 24, 2023 · My constant error pointed to bank 1 (27B0) and I can see the issue with my scope plain as day. " I checked the emmission control air pump with the engine running and it was not working. See full list on obd-codes. Time to clean! Drives: like a granny. Jan 26, 2011 · I threw a check engine with a error code of "secondary air system bank1 and bank2. Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand. Aug 16, 2024 · Diagnostic trouble code (DTC) P0491 stands for “Secondary Air Injection Insufficient Flow Bank 1. kfjpmv brzv vry xwtjsgx tfloj daef qydixk lzkakc zai kuday