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#1
15th February 2009, 10:58 AM
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Fault Code 16684 and 16689 Misfires!
Out for a drive yesterday when Engine management and cat light came on:
Sunday, 15 February 2009, 10:59:22 VAG-COM Version: Release 409.1-S Control Module Part Number: 4D0 907 557 N Component and/or Version: 4.2L V8/4V MOTR AT D01 Software Coding: 04373 Work Shop Code: WSC 02324 2 Faults Found: 16684 - Random/Multiple Cylinder Misfire Detected P0300 - 35-10 - - - Intermittent 16689 - Cylinder 5 Misfire Detected P0305 - 35-00 - - Misfire is very noticable. So swapped coil pack on 5 with 6 and fault stays with 5. Swapped coil pack with 7 and fault stays with 5. Swapped plugs between 7 and 5 and fault stays with 5. What do we think next please? Ignition Control Unit? Broken Wire? Dont think it's injector as Cat light coming on indicates unburnt fuel! Mike
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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. 
Last edited by Conan_the_Librarian; 6th May 2009 at 03:53 PM. 
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