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#1
17th April 2013, 01:22 PM
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EML Secondary Air Injection flow to low
I had the following codes appear which triggered the EML.
17831 - Secondary air injection system - Bank 1 - flow too low 17819 - Secondary air injection system - Bank 2 - flow too low After researching on the internet and here, I decided to investigate the vaccuum lines. As I didnt have a vaccuum tester, I just pulled off individual vaccuum pipes and put my finger at one end and blew on the other end. In doing this, I was able to find the leaking vaccuum pipe and resolve the problem. Other than triggering the EML, this fault caused no running issues, and really was just an annoyance. Thought I would add this here, as the vaccuum hoses on our engines will be starting to get a bit frail and tatty and issues like this are likely to occur.
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01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012 
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#2
17th April 2013, 07:16 PM
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Hey Ranj,
I have this same issue. The SAIs are at the back of each head and add air to the exhaust flow to help warm up the cats at the time of engine start. Failure can be due to secondary air pump or the injectors on each head. With both showing, I'd start with the pump. If the pump is fine the remove and wash out the injectors in v hot soapy water (not a degreasant) and reafix. Its not terminal, but will shorten the cats life. HtHs
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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