Question about 1999 Audi A6

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Have a 1998 A6. the ABS light come on,then the onboard computer starts showing a oil Pressure Fault & a ABS System Fault. The rev counter does not work . Also itgets stuck in a single gear , i think 4th. Thought it could be a dash board fault so have had this removed and checked all OKay. Also when the bonboard comuter has been hooked up it says that ther is no fault. Every think was working fine until I went up & over a long and steep hill. Lot of braking. Thanks if anyone can help

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6ya6ya
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Posted on Jan 02, 2017

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TLRogue
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SOURCE: audi a6 on board computer reading faults

i would check charging voltage when this happens. The voltage at the battery should be around 14 volts engine running. If there is a drop in voltage, this can affect the vehicle control units, bringing on warning lights. Check it at tickover and at a higher rpm, if there is a significant difference say 3 volts, then replace the alternator.

TL

Posted on Jan 25, 2009

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SOURCE: AUDI A6 WONT START ON KEY BUT WILL ON TOW - FAULT

i have audi a6 2005 ,i turn the key to start noting happen, the lights on the dash does not come on, i checked the battery is good, when the key is on on position the stearing wheel is not unlocked

Posted on Dec 22, 2009

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1 Answer

Good Day I"d like to why my 1998 Audi A6 ABS and oil light goes on after driving half an hour.I changed the oil pressure switch. Should I remove the positive battery terminal to reset it.


The best solution you'll get from books at www.reliable-store.com

These are books containing info on repair, service, troubleshooting, parts info, assembling dissemble, removal, error/fault codes, wiring diagrams and everything on any vehicles cars, atv, trucks. forklifts, boats, excavators etcv

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is it just the instruments that are acting up? if so thats probably a bad connection somewhere that, when in a certain temperature zone, say from 90 degrees to 130 for example, doesnt have enough current but when heated, regains the current. but if you mean "auto box malfunctions" as in your automatic transmission does not work, then its time to have some pros take a look at it.

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Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

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1 Answer

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1 Answer

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AUDI A6 WONT START ON KEY BUT WILL ON TOW - FAULT SHOWING AT ABS - TRIED NEW ABS UNIT - BRAIN IS NOT COMUNICATING WITH ABS UNIT. TRIED NEW WIRING LOOM - NO REVS WHEN FAULT SHOWING


i have audi a6 2005 ,i turn the key to start noting happen, the lights on the dash does not come on, i checked the battery is good, when the key is on on position the stearing wheel is not unlocked

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1 Answer

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something must be grounded on your instrumental panel, try replacing the relay or fuse.

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4 Answers

Audi a6 on board computer reading faults


you have a thermal fault i the abs modulator <ecu bolted onto pump> the rev counter fails because this signal fails to get from 13.8 volts to zero it only manages to get to about 3 volts this is very common on bosch 5 series mine had pt code bosch 0273004285 and is notorious but easil removed and sent to bba here in uk or others in usa you will have to remove wheel then washer bottle then modulator but car stiill drives when removed the esp needs signal from abs and fails at same time also loss of tacho signal puts il light on i tried to find second hand one biut they didnt work have sent mine for repair<you need a microscope to do it> will post when it comes back ps easily confirmed by spraying abs pump.modulator with freex=zer spray did it to mine and fault dissappears untill warm again nb even when cold i bet if you brake hard a couple of times it will fail please let me know if your pt number is same as mine and if this heelps it drove me nuts

Jan 21, 2009 | 1999 Audi A6

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