P0491 Empowering You with Comprehensive Diagnostic Techniques

engine code P0491 and P0492 problem solved ... I have been able to fix these trouble codes on the secondary air injection system with the help of ... Find out everything about the P0491 fault code In this video, we will explore the description, symptoms, causes, and solutions to resolve ... i might try to see if my MAF is dirty... this is the best info i think i have recieved yet. ... period during which the AIR pump is energized is ... Here is the schematic for an 03 manual: There should not be a vacuum line running back to the transmission area, if it is open you have a vacuum leak which can ... I bought this for my 2003 E46 BMW 325xi to fix the check engine light for code P0491 and P0492 which showed an error on the secondary air injection. Diagnose ... 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 ... Need to erase this codes for a 2010 Q5 3.2 FSI. Thanks in advance for your help. Attached Files .rar ... 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. Turns out that a line from the secondary air injection system was disconnected. Pretty sure it happened at the full service at BH Lambo. P0491 and P0492 indicate that you have insufficient air injection flow into the exhaust manifolds. The oxygen sensors are looking for a leaner ...