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| D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
27th April 2014, 03:31 PM
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DIY Catalyst/O2 Sensor Replacement
I have code 16814 - Catalyst System; Bank 2 p0430 - 002 - Efficiency Below Threshold - MIL ON
Been like this since the 2nd day I had the car (I think the dealer reset it before I tested it and then again before I drove it away). It scraped past the emissions test in the last MOT and I am looking to get it fixed as the light wont go out and stay out. I am assuming that there is excess soot in the cat. I have been advised this is the case by a reputable indie in Burwell, Cambs and black smoke/soot coming out the exhaust when revved seems to confirm this. I have tried Cat cleaner/additive and keeping revs at around 5-6k on the motorway for a few miles but this hasnt cleared out the soot in the catalyst and the emission lamp remains on. If this is indeed a cat replacement, has anyone attempted it themselves? I was quoted £2000 by another indie in Portsmouth which I simply cannot afford at the moment. If I knew it is a DIY case I would happily go for it on my own. Any experience or similar tales would be greatly appreciated! As would any mechanical help in the Hampshire/Surrey region 
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D3 A8L 4.2 Quattro 
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#2
27th April 2014, 06:10 PM
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If you've got VAGcom I think you can manually activate an active DPF regeneration cycle which you should try first
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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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#3
27th April 2014, 07:18 PM
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Quote:
Out of curiosity, what does that involve? The idea of being able to do stuff on your car via a computer is still a novelty! 
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D3 A8L 4.2 Quattro
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#4
27th April 2014, 07:23 PM
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No DPF on a petrol.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#5
27th April 2014, 10:53 PM
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Quote:
DPF regen basically involves the computer repeatedly cycling the engine at quite high revs to simulate taking the car for a good thrash lol. Rather like the MOT emissions test you do need to make sure that all of your belts etc are in good order as there is always a small risk of one snapping whilst the engine is at such high strain.
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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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#6
28th April 2014, 06:46 AM
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IIRC The cat below efficiency error starts cropping up when the cat is 94% efficient and triggers the engine light. Even with the light on and the fault code the car should breeze through the MOT. Check the air filter to make sure its not clogged up.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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#7
28th April 2014, 10:40 AM
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Quote:
Will do, thanks. It is an ex-london car so probably needs a good de-smog anyway
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D3 A8L 4.2 Quattro
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#9
2nd June 2014, 09:27 PM
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Once the fault is resolved, it will take multiple restarts for the fault to clear itself. Usually around 32 but could be a lot more. Far easier to get the faults erased with VCDS as you'll know soon enough if the problem is cured, instead of hoping the light will eventually go out.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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#10
2nd November 2014, 10:56 AM
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I agree get the light turned off first and see if it comes back on at all you may find it stays off now.
Unless of course your cats have truly had it. In witch case it may be cheaper to just install 200 cell sports cats instead. Given they are similar money
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Hybrid Mode
