amvauto

Hi, having problem here, hoping to get some help.
Driving car one day after new keys were cut and programmed at Audi for my 2001 A8, all of a sudden alternator light came on, then slowly ABS, Airbag, battery and all the lights came on, wipers were SOOOO slow and car started slowly dying on me, got a boost and started fine ran for a couple of minutes, then started putting and then died and wouldnt stay on, turned on but off couple of seconds. Towed it home did a vag-com and got this:

17526 - Oxygen (Lambda) Sensor Heating: B1 S2: Open Circuit
P1118 - 35-00 - -
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 35-10 - - - Intermittent
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-10 - - - Intermittent
16946 - System Voltage Too Low
P0562 - 35-10 - - - Intermittent
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
Readiness: 0010 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 4D0 927 156 DF
Component: AG5 01L 4.2l5V USA 0507
Coding: 00012
Shop #: WSC 01117
1 Fault Found:
18158 - Supply Voltage too Low
P1750 - 35-10 - - - Intermittent

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 4D0 907 389 E
Component: ABS/ESP allrad D46
Coding: 08397
Shop #: WSC 01117
2 Faults Found:
00532 - Supply Voltage B+
35-10 - - - Intermittent
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

Hoping something related to Voltage Regulator changed that and still the same, new battery and still not staying on, car turns on, runs nicely for 5 seconds then dies, try another time turns on, putts then dies as well...I checked these error codes on WIKI and conflicted if it is needing an ALternator replacement? Or cables, contacts, or is it immobolizer problem related to the new key change?
Please help...again car ran fine for 2 days after new key change then alternator light came on....help would be really appreciated....\\thanks yall

igotav8

Sounds like you need an alternator to me

silverd2

My guess too.

Put a volt meter on the battery with the car running...should read over 13.5 volts.
If low, it may not be the alternator itself...first look at the power junction (large wires to small box) in the front right fenderwell...common corrosion point in these cars that interrupts power getting from alt to battery.
IF it's the alternator, it's likely just the voltage regulator on the back of it, which is replacable. The entire alternator is NOT often the culprit.

Good luck.

amvauto

Hi thanks, yeah I had it checked from AAA and it was low, cant remember the reading..but I did change the regulator on the alternator, also clean the junction on the frame behind the passenger front wheel as well as on the alternator itself, changed the battery also...still not working? So dont know what else it could be?

silverd2

Since it's developed the problem, have you put a meter directly to the alternator when running?

amvauto

No I havent done this. But alternator light is on after turning on car and AAA did a check and it was low on their scale which is probably lower than it should be.

silverd2

AAA may have only checked it at the battery...not unusual...with everthing else OK(?), this is usually an accurate method.
A check right at the alternator will isolate the problem...it should be putting out over 13.5 there...and near the same at the battery posts.