Battery problems

Battery: It accumulates the electrical energy generated by the alternator. It provides energy to all the electric and electronic circuits of the car.
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The doesn't want to start due to battery terminal main fuse

Audi A4 2008 Bre 200000 miles
Not starting due to positive main fuse wire is torn the wire we don't know where you it goes
Zakes from South Africa 10 months ago  
ZA
1 report 

New battery registration

Audi A4 2009 2.0 142000 miles
Installed new battery need to implement
audi from United States 10 months ago  
AU
2 reports 

Not start after i mix the terminal battery

Audi A4 2010 Sedan  169000 miles
I connect bettry wrong when i jump start
Frans from South Africa a year ago  
FR
2 reports 

Not cranking not starting

Audi A4 2007 A4 1.9 diesel  110 miles
I just change the battery but today not starting and the light sign in dashboard coming up flashing
John from Ireland 2 years ago  
JO
3 reports 
Bülent from other 2 years ago
Otomatik konumda r konumu panelde vites ışıkları yanıp sönüyor vites boşa aliyor
John from Ireland 2 years ago
Not the gear bb hhhh hhgg
Comment

Crank no Start

Audi A4 2008 A4 Quattro 2.0T Cabriolet, Auto - 4 cyl 123000 miles
Dec. 2024 - Rough start, then Limp Mode until it Stalled at Gas Station.
Completed
July, 2024 - Replaced: Spark Plugs w. E3-2 & Ignition Coils fr. Amazon. April, 2025 - Cleaned: MAF; Camshaft Control Sensor; Throttle Body Intake

To do:

Recharge: Battery

Replace: High Pressure Fuel Pump & Cam Follower - ASAP
" Crank-Shaft Control Sensor - ASAP
" Diverter Valve
" Coolant Multi-Valve
Check Fuel Filter
" Low Pressure Fuel Pump & its Control Unit; Fuse(s); Relays; other Sensor(s)
slapmaster2 from United States a year ago  
SL
2 reports 
Thembash from other 8 months ago
Has this issue been resolved?
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Hard start but only after a trip.

Audi A4 1999 Sedan, 1.6 , manual  350000 miles
Sometimes it's hard to start. Battery is good. When the engine is cold it starts immediately. After a trip and when the engine is still hot (after an hour) it's hard to start.
Pantelis from Greece 4 months ago  
PA
1 reply 
Bobby bacon from United States 4 months ago
Usually caused by a leaking fuel injector, a failing fuel pump check valve (causing a pressure leak), or a failing coolant temperature sensor sending incorrect data to the engine computer
Comment

Battery drainage

Audi A4 2011  28000 miles
Drains battery. Runs abs actuators, egr and diesel pump until battery is flat
dekzit from Sweden 5 months ago  
DE
1 report 
Miss from United States 5 months ago
I ran a diagnostic only thing came back was sparks plugs and ignition coils couplevother possible. Then next morning would attempt to start and my fob didn't work. Not sure if fuses were hooked up wrong or what the problem is
Comment

Electrical Parasitic Loss

Audi A4 2005 3.0 litre, manual transmission 165000 miles
It was minor at first, a slow drain over a week, when the car was locked and car alarm active. If the the car was unlocked, for a month, it was fine. In the last month, it's gotten much worse.
The battery is about three(3) years old. After being on a battery tender overnight, the battery would show 12.9 volts. Idling it would show ~13.4 - 13.5 volts.
Now if the car is locked the drain is rapid, over the course of three hours(3), it had to be boosted to re-start. If the car is unlocked overnight, there's still a battery drain, and the car must be boosted to start.
Steve505 from Canada 10 months ago  
ST
1 report 
Deim from Ireland 9 months ago
The battery in my Audi a4 b8 has died and the car is locked and I am unable to unlock it the key is won’t unlock it with the buttons or the key in the car cause it won’t twist. I managed to the bonnet open to try jump the battery but still doesn’t work
Comment

May be anti theft issue???

Audi A4 2010 Sedan 14000 miles
While driving, my car lost all power, no dash lights, etc. It spuddered to a parking lot. I replaced the battery, and checked all fuses, I regained power, but car still will not turn over.
Drobb from United States 8 years ago  
DR
5 reports 
Niko from United States a year ago
Has to be the alternator
Comment

Lights flashing on top (SOS and airbag)

Audi A4 2017  160000 miles
Sometimes the airbag and SOS light is flashing. I already changed the battery but the problem remains.
Konni from Germany 4 months ago  
KO
1 report 

Won’t crank no start.

Audi A4 2007 Quattro/automatic/sedan 140000 miles
So i have a brand new battery hooked up to it. Put the key in and the dashboard lights up. I turn the key once I hear clicking and everything starting up then try to turn the key on and nothing happens. All fuses are good. ECU‘s working checked all relays and they’re all working.
Joeys headache from United States 8 months ago  
JO

Audi A4 Help

Audi A4 2017 Audi A4 Quattro 92000 miles
My battery is draining when the vehicle sits for a a day or two. I also hear a clicking sound when the engine is shut off. Sounds like something is trying to engage when nothing is turned on or running. Could this be a bad relay, if so, which one?
Raydaughhetee from United States 9 months ago  
RA
1 report 

No start no communication with ecu

Audi A4 2008 2.0 tfsi audi cabriolet b7  185000 miles
Car cranks starts cuts of immediately after few attempts the key jus clicks no crank no start pull the battery terminal out then repeats process an the pump stays on till u remove the main relay or the. Battery
Sherwin from South Africa a year ago  
SH
2 reports 

Electrical

Audi A4 2009 4dr 2.0 turbo  194000 miles
I put new ignition switch in and connected battery but all I get is dash lights airbag traction epc abs and brake. Locks lights nothing works. Please help
Joenchristi17 from United States a year ago  
JO

Electrical issues

Audi A4 2003 L4, 1.8L; 20V; Turbo 152869 miles
I have a 2003 Audi A4 1.8T & Every time I connect my battery my hazard lights start to go off non stop...
Eddie from United States 2 years ago  
ED
3 reports 

Rns-e si blocca

Audi A4 2007 B7 260 miles
Ogni tanto il mio rns-e originale audi, sembra che si spegne, ma non lo è e durante la notte mi scarica batteria..
Paolo from other 2 years ago  
PA

Cranks over but won’t stay running for long until it cuts off

Audi A4 2007  198000 miles
OK so I got this car for free it’s a 2007 Audi A4 2.0 engine I knew it was something simple but as soon as I got it the battery that came with the car we shot the dude kept jumping it…I said you just you’re gonna kill the battery which he did..got it home started working on it and ended up it was two relays that were bad And we got another battery. when we hooked the battery up All of the lights come on even lights that I’ve never seen before so I knew something was right She will start up but she won’t stay running for long until she cuts right back off? Brand new fuel injectors, brand new ignition coil packs, brand new spark plugs, and 2 sensors were brand new also…please someone help
Dani from United States 2 years ago  
DA

1997 Audi A4 B5 2.8 V6 has no spark though it has been servicedviced

Audi A4 1997 2.8 V6 manual 200000 miles
Engine has been just replaced. The starter cranks but the engine does not turn. Battery is fine. Problem is no spark. Please help.
Zizi from South Africa 3 years ago  
ZI
1 report 

Lights flashing

Audi A4 2006 Manual  150000 miles
I have an oil pressure sign on the glow plug sign is flashing the ESP warning is on. I've been losing power every so often driving and today I was over taking and all the above warning lights have come on.
I pulled over turned car off and waited when I went to turn car back on it took a while to turn over and start, I wasn't far from home so I turned round and headed the 15min drive back half way hm battery light came on as well and car died so I waited and got it going again it took a bit to turn over. I got home its booked in with an Audi garage tomorrow but being a girl I would like a rough idea of what's going on any ideas thanks
Spudz from Ireland 7 years ago  
SP
5 reports 

No pick up

Audi A4 2004 S4 cabriolet  90000 miles
The car changes gears too quickly it is in 6 before it should only be 4. Revs low. I had a new battery put in so maybe faults it has been scanned and cleared.
I would not feel comfortable overtaking it is a v8 3.2 and it has always had so much grunt.
Mazz from New Zealand 9 years ago  
MA

Computer off, don't star

Audi A4 2006 4 door 123 miles
The car don't star
With move one of the fuse to a different post with star the engine and make a noise like went the battery is not dight, an after that does not star. Thks
Mike from United States 10 years ago  
MI
6 reports 
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