Ottoman56

Hello everyone.
I have a 2001 Allroad 2.7t. I am getting a trouble code of P0491 which is the
secondary air system. I installed a New OEM secondary pump. When the car starts for the first time I can hear it running. When I put it in I checked the lines coming off of it everything was clear. I have had the O2 sensors checked as well. I cleared the trouble code but it keeps coming back. Does any body have a suggestion as to what I might be missing?

PaperToast

prolly the combi valves are broke

Kneale Brownson

Had my SAI system tuned out. It was making a lot of noise.

Devin183

So my 98 audi a6 quattro 2.8l has thrown code for low flow on bank 1 for my secondary injection system im trying to trouble shoot and find where the combi valves are located in this vehicle. I have checked my lines and they all look good. My pump wont turn on when i start car over but havent tried it on a cold start yet. Any advice?

erionracing

check all the hoses connected to combination valve and check the fuse box. Ive had numerous people here who have checked the fuse box with a 40amp fuse out.