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| D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
4th March 2013, 08:01 PM
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Lambda probe replacement B1, S1
It would seem that the pre-cat lambda probe on Bank 1 is failing, currently flagging intermittent faults which cause the CEL to come on. Clear the fault and it will pop back up again 100 miles or so later. Whilst the probe itself does not seem to expensive to get hold of, how difficult is access to change Bank1, Sensor 1.
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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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#2
4th March 2013, 10:18 PM
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O2 sensor
O2 sensor isn't easy to access from top or bottom....however if you take out the inner wheel arch towards the read of the front wheel...there is a cubby hole you might be able to go through to it.
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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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#3
5th March 2013, 10:17 PM
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Is bank 1 sensor 1 driver's side? If so I watched my local mechanic undo it using a crow's foot and a wrench extension. Only things removed were air box and plastic intake tube if I remember correctly. Its tight in there but doable from the top.
The passanger side was also done from above, he removed the secondary air pump pipe for that bank only (the small metal fitting attached to the rear of the block). I got one similar to this, http://www.ebay.co.uk/itm/FRANKLIN-T...item256f36d8a6
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#4
6th March 2013, 07:01 AM
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I do believe that bank 1 is UK drivers side. My car is having some more work done tomorrow discovered during its service last week, and I am away this weekend so will take a look in a week or so.
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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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#5
9th March 2013, 07:48 AM
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Well as expected after 200 miles my engine light is back on again, it spends more time lit than off these days. I'll scan it with VCDS later and see if what it is this time, I suspect cats and lambda again. The cat fault does not bother me, since it easily passes the MOT emissions test. The lambda does though, since its the pre cat and could be affecting fuelling.
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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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#6
9th March 2013, 12:01 PM
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Looks like its Bank 2 Sensor 1 that is the issue.
16814 - Catalyst System; Bank 2: Efficiency Below Threshold P0430 - 35-00 - - 16804 - Catalyst System; Bank 1: Efficiency Below Threshold P0420 - 35-00 - - 17539 - Oxygen (Lambda) Sensor; B2 S1: Internal Resistance too High P1131 - 35-10 - - - Intermittent Readiness: 0000 0000
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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
12th March 2013, 01:01 PM
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You may as well change both pre-cat lambdas at the same time. My Bank 2 went, and within a few months the bank 1 sensor went too. Same as yours intermittent fault kept coming back.
Also best to get new ones, I tried a second hand one at first and that was triggering the fault code too.
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