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#1
4th August 2013, 04:36 PM
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Car Misbehaving
Car has started to jerk when putting my foot down, like its hesitating. Only does it when you floor it and not if you build the revs up slowly.
Had the code read today and have come up with the following, some of which were listed in the book and some weren't. Could anybody help with the codes that weren't listed and also with opinions on what you think the problem may be. Ive spoke to a few people (mechanics) who reckon it could be something to do with the Mass flow meter. codes as follows: 17538? 17536 - system too lean bank 1 17545? 17549? 17547? 16486 - mass or volume air flow low input 18265? 01578? Thanks Adam
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#2
4th August 2013, 04:50 PM
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17538/P1130 - Fuel Trim; Bank 2 (Mult): System too Lean
Possible Symptoms Malfunction Indicator Light (MIL) active Possible Causes Mass Air Flow (MAF) Sensor faulty Oxygen Sensor Control faulty Oxygen Sensor(s) faulty Fuel Injector(s) faulty Possible Solutions Check Mass Air Flow (MAF) Sensor Check Oxygen Sensor Control Check Oxygen Sensor(s) Check Fuel Injector(s) 17536/P1128/004392 - Fuel Trim; Bank 1 (Mult): System too Lean Possible Symptoms Malfunction Indicator Light (MIL) active Possible Causes Mass Air Flow (MAF) Sensor faulty Oxygen Sensor Control faulty Oxygen Sensor(s) faulty Fuel Injector(s) faulty Possible Solutions Check Mass Air Flow (MAF) Sensor Check Oxygen Sensor Control Check Oxygen Sensor(s) Check Fuel Injector(s) 17545/P1137/004407 - Fuel Trim: Bank 1 (Add): System too Rich Possible Symptoms Malfunction Indicator Light (MIL) active Possible Causes Mass Air Flow (MAF) Sensor faulty Fuel Pressure Regulator faulty Fuel Injector(s) faulty Oxygen Sensor Control faulty Oxygen Sensor(s) faulty Evaporative Emission (EVAP) System faulty Possible Solutions Check Mass Air Flow (MAF) Sensor Check Fuel Pressure Regulator Check Fuel Injector(s) Check Oxygen Sensor Control Check Oxygen Sensor(s) Check Evaporative Emission (EVAP) System 17549/P1141/004417 - Load Calculation Cross Check: Implausible Value Possible Causes Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71) faulty Vacuum Lines faulty Possible Solutions Check Mass Air Flow Sensor (G70) OR Manifold Pressure Sensor (G71) Check Vacuum Lines Check Engine Operating Conditions => Meas. Blocks Special Notes Uwe: I think this code is set when the airflow being measured (or otherwise calculated) by the ECU doesn't make sense given other operating parameters such as RPM and throttle opening, manifold pressure, etc. 17547/P1139/004409 - Fuel Trim: Bank 2 (Add): System too Rich Possible Symptoms Malfunction Indicator Light (MIL) active Possible Causes Mass Air Flow (MAF) Sensor faulty Fuel Pressure Regulator faulty Fuel Injector(s) faulty Oxygen Sensor Control faulty Oxygen Sensor(s) faulty Evaporative Emission (EVAP) System faulty Possible Solutions Check Mass Air Flow (MAF) Sensor Check Fuel Pressure Regulator Check Fuel Injector(s) Check Oxygen Sensor Control Check Oxygen Sensor(s) Check Evaporative Emission (EVAP) System 16486/P0102/000258 - Mass Air Flow Sensor (MAF/G70): Signal too Low Possible Symptoms Malfunction Indicator Light (MIL) ON Loss of Power Possible Causes Wiring and/or Connector(s) from/to Mass Air Flow Sensor (MAF/G70) faulty Mass Air Flow Sensor (MAF/G70) faulty Possible Solutions Check Wiring and/or Connector(s) from/to Mass Air Flow Sensor (MAF/G70) Check/Replace Mass Air Flow Sensor (MAF/G70) 18265/P1857/006231 - Load Signal: Error Message from ECU Possible Symptoms Malfunction Indicator Light (MIL) active Possible Causes Fault Code(s) stored in Engine Control Unit (ECU) Possible Solutions Check Engine Control Unit for Fault Code(s) All points towards mass air flow sensor. I would try to clean it out and then replace it if it doesn't resolve things, also check your vacuum lines for leaks/holes wherever you can on the engine. 
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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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#4
4th August 2013, 08:44 PM
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its important to only use a proper MAF sensor cleaner or electrical contact cleaner as anything else could affect readings - something like THIS or Electrical Contact Cleaner from maplins as an alternative
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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
4th August 2013, 10:39 PM
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Before cleaning anything do a log of your MAF reading g/s from VCDS together with RPM at idle and when driving around. This should tell you if the MAF is faulty.
Lambdas usually have their own unique code so perhaps its not them. I cleaned mine twice in Isopropyl aclohol left overnight with the metal element submersed in Isopropyl overnight in a little plastic bag. Make sure it is competely dry before putting back into car and starting. You can get it from Maplins it comes in a big spray can. I also went a bit over the top and gently brushed the exposed metal element with a glassfibre brush (for cleaning electronics before soldering). This is to try to clean any oxidised deposits on the element surface. The MAF worked fine after this cleaning procedure and lasted around 4 years until it was stolen. Here is my old error read out resulting from a bad MAF. I also had 1 bad lambda sensor. 5 Faults Found: 17539 - Oxygen (Lambda) Sensor; B2 S1: Internal Resistance too High P1131 - 35-10 - - - Intermittent 17538 - Fuel Trim; Bank 2 (Mult): System too Lean P1130 - 35-00 - - 17536 - Fuel Trim; Bank 1 (Mult): System too Lean P1128 - 35-00 - - 16485 - Mass Air Flow Sensor (G70): Implausible Signal P0101 - 35-00 - - 17545 - Fuel Trim: Bank 1 (Add): System too Rich P1137 - 35-00 - - Readiness: 0010 0101 And I aslo had the same load error for the ABS brakes and Auto Trans: Address 03: ABS Brakes and Address 02: Auto Trans 1 Fault Found: 18265 - Load Signal: Error Message from ECU P1857 - 35-00 - -
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#7
6th August 2013, 01:01 AM
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Cheers for the info guys its going into a mates for him to have a look on Wednesday, I did try cleaning it with electrical cleaner but no joy.
Also when you give it some the traction control light and ABS light come on together and then go off when you let off, only when you really give it some. The guys at A8 Parts have a Mass flow air meter but its covered nearly the same amount of miles as mine so may just get one from TPS or Smith Knight Fay. Thanks again
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#8
7th August 2013, 08:41 AM
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Quote:
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#9
7th August 2013, 10:15 AM
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Been to a mates who owns Wabtec Developments VW/Audi Specialist in Manchester this morning, we've cleaned the mass air flow sensor again and touch wood that seems to have solved the problem.
Gave it a good run and it doesn't seem to be doing it. Its going back in tomorrow morning to have the gearbox oil drained and changed also the filter. Thought it best to get this done seeing as its on 117,000 and not been done.
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#10
7th August 2013, 10:44 AM
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Make sure the gearbox gets a good 'flush' too, otherwise you could be just stirring up the 'gunge' and inviting problems. The garage needs to have the famous 'sucky, squirty, whatever it is' gizzmo that's been mentioned here a few times
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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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Linear Mode
