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#1
16th June 2014, 01:39 PM
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I'm not sure if that would cause a misfire (someone here will know and be along soon!).
But to get it changed, just find a decent independant local exhaust specialist and give them a call. Ask for a quote - I'm sure they could sort it in less than an hour.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!). 
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#2
16th June 2014, 02:29 PM
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I'm not convinced that the lamba fault would cause a misfire either.
You say the misfire is noticeable at idle but are there any other symptoms when it's running normally? I had a "misfire" at idle and the car felt a bit down on power - no relevant codes were stored. After swapping a few bits and having a bit of a think, I finally tracked it down to a faulty fuel pump. The old pump was causing a fluctuation in fuel pressure that was causing the car to run poorly and it had seemed more noticeable at idle for some reason.
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#3
16th June 2014, 02:46 PM
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I was just going to say check the fuel system and pump! good call
__________________
Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#4
16th June 2014, 02:58 PM
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As Mike says, front lambdas can be reached from above the engine by removing the Secondary air injection kombi valves (metal mushrooms on back of engine block). My local mechanic changed both of my front labmdas this way in less than 1 hour. No exhaust dropping necessary.
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#5
16th June 2014, 03:04 PM
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The fault code is for heating element of lambda sensor, very unlikely to cause misfires. The sensor in question is precat on the downpipe. Not sure about 40V but on 32V it's fairly accessible from the top if you have lambda sensor socket also there is not much space.
If you have VCDS check the measuring blocks for misfires to see if they are random or mostly on 1 cylinder or on 1 bank.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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