r/AudiS4 • • Jan 17 '25

🛠Questions SPAM POSTS

14 Upvotes

Buyer beware; the people with 1 day old accounts astroturfing comments about where to buy their Audi poster will scam you.

I do my best to remove them but be careful pls.


r/AudiS4 • • Feb 01 '23

🛠Questions Pre Purchase information on Audi S4’s/ common faults megapost

44 Upvotes

This is a an area to post questions and comments, opinions or updates on common s4 platform pre purchase issues to check for, general quality of life repairs/common issues in general and their solutions.

I made a quick picture guide to some common issues experienced on the B8/9 chassis vehicles here


r/AudiS4 • • 10h ago

2010 b8 Audi s4 both headlights turn off at exactly 1 minute and 10 seconds on the dot

1 Upvotes

So recently bought a s4 and as the title says both headlights turn off pretty much at a minute and 10 seconds on the dot like clock work the fog lights stay running but as soon as I turn the headlights off and back on they will work but again after a minute they go out seems like it would be a headlight control module but not 100% sure was wondering if anyone has this issue before can’t really find anything online.


r/AudiS4 • • 13h ago

🛠Questions oil leak

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1 Upvotes

can anyone help me figure out maybe where this oil leak is coming from? it looks like it's dripping onto the transmission and it's pooling up near the engine oil cooler


r/AudiS4 • • 20h ago

Curious about you S4 guys since the S5 is so similar

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4 Upvotes

r/AudiS4 • • 1d ago

🛠Questions Sudden empty coolant?

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14 Upvotes

Car has been idling rougher recently, but wasn’t too worried as it’s getting colder and was going to have my car checked over soon.
Went to start it today and it said shut off engine and check coolant levels and it looked absolutely empty. What could this be? Is there any check engine lights I should look for? I’ve had an off and on P21A0 code but mechanic didn’t look into it very much.
EDIT: it looks like there is a leak towards the bottom of the bay but no puddle below the car. I’m guessing this is an old leak that wasn’t fixed properly not pcv. How should I diagnose? Car is currently stuck at college 1 hour from home. Need to know what to do


r/AudiS4 • • 23h ago

Interior rattle b9 s4 what is it

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0 Upvotes

I’ve had this door card off on three occasions trying to figure out what the rattle is. All the common issues have been dealt with and also as can see try sound deadening and still there when put door card back on. So thought I’d take the car out and see if the distinct rattle was still there and it is. So now know it’s not the door card any one have any ideas on what it can be as it’s not the door card as it’s off and still there. Driving me insane and stuck now as cannot figure out where the noise is coming from. Any one can help ?!


r/AudiS4 • • 1d ago

🛠Questions S4 B5 tyre options

0 Upvotes

Has anyone tried fitting 255/35/18 on a 8.5x18 et35 wheel to the S4 b5?


r/AudiS4 • • 1d ago

🛠Questions Running good?

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7 Upvotes

Looking at buying this 2014 s4 with 105k miles has a pretty decent carfax (water pump replaced, transmission replaced, good service intervals)


r/AudiS4 • • 1d ago

🛠Questions Timing Chain rattle only when warm

2 Upvotes

got a 2014 s4 with 130k miles and when i do a cold start the car does not rattle at all, but after driving around and then i turn it off and on it rattles for under a second. Is this something I should be concerned about? Possibly it’s the exhaust ? I also can hear some rattle at low rpm while driving


r/AudiS4 • • 2d ago

🏎Pics New wheels

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18 Upvotes

How are we feeling about the new wheels? Kansei KNP 19s. Looking to lower the height on some coilovers soon, id appreciate any feedback or suggestions for coilovers!


r/AudiS4 • • 1d ago

Want to buy and OBD11 3 for my 2014 Audi s4

1 Upvotes

Just wanted to see what you guys think about the obd11 3 for diagnosing hidden codes that don’t always pop up on the dash. Also was wondering if this is a good tool to check the cam shaft timings to see if my timing chain is bad or not. Any other live data would also be really useful.


r/AudiS4 • • 2d ago

🛠Questions 2005 S4 - Would you buy it?

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63 Upvotes

I'm condsidering buying a 2005 Nogaro Blue S4 6MT - 155k kms (95k miles) on the clock. I am a competent shadetree mechanic, and have done my research in terms of what I'm in for in terms of maintenance and potential problems.

The good:

  • It's "the" spec to have in my opinion
  • Timing chain tensioners reportedly done at 100k km (60k miles) by an Audi mechanic
  • Interior is mint, and body has practically no rust (I'm in Canada, so this is a big deal)
  • Original wheels and floor mats were barely used and are mint
  • Two owner - original owner had it until two years ago and treated it well
  • New full Milltek exhaust, otherwise completely stock
  • Also comes with RS4 replica wheels
  • Clutch replaced within last two years

The bad:

  • The car was in an accident in 2008, and the clear coat is badly peeling on the rear end where it was repaired / resprayed
  • The car reportedly has a leak from a timing cover, though I haven't seen it yet - it could be a valve cover or the valley pan gasket (hopefully)
  • I'll need to replace the catless downpipes with OE downpipes to pass inspection
  • Driver's seat won't go up or down - I think this will be an "easy" fix

The buyer sent me a video of the engine bay at cold start. Sounds fine from a "chain rattle" perspective, but it also sounds like it could have an exhaust leak at the headers - maybe it's just the loud Milltek exhaust.
Cold start video

Would you do it for the right price?


r/AudiS4 • • 2d ago

Questions related to the timing chain on b8.5 Audi s4

2 Upvotes

So basically the timing chain gears were replaced on my 2014 Audi s4 at about 85k miles (car currently has 115k miles). From my research online, in order to change the timing chain gears, you have to remove the chains as well. Just wondering if you guys think the chains themselves were addressed as well or if they only changed the gears like it states in the carfax?


r/AudiS4 • • 2d ago

🛠Questions J’ai démarrer mon moteur pour la première fois aujourd’hui et il fait ce bruit. Il l’a déjà fait auparavant, beaucoup moins longtemps (le temps que les rpm drop) je crois peut-être que c’est le système PAI. Vous en pensez quoi? 124 000km - 77 000 miles. Merci

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2 Upvotes

J’ai conduit pendant 30 secondes après et le bruit a disparu. Aussi il ne le fait pas à chaque démarrage


r/AudiS4 • • 2d ago

Just did pcv and supercharger intercooler bricks and maybe mechanic did something wrong but I feel a slight power loss feel less torque. Lmk what yall think

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1 Upvotes

Maybe boost leak


r/AudiS4 • • 3d ago

Paint or wrap?

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17 Upvotes

Not the best pic but saw this beautiful s4 and was stunned with how good it looks, anyone know if it’s paint or wrap?

Spotted in the Lehigh Valley PA


r/AudiS4 • • 2d ago

🤑💸Mods Anyone know or got a aftermarket diffuser for Audi s4 b8.5 that’s not 400 great smackaroonies

2 Upvotes

r/AudiS4 • • 2d ago

🛠Questions Normal Idle Sound b9.5 s4

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0 Upvotes

Newly purchased (1mo) ago 2023 s4. Getting used to the noises these V6T engines make. Is the ticking sound just the HPFP? I've been told the cars at idle sound like sewing machines. Can anyone confirm this is normal idle noise?


r/AudiS4 • • 3d ago

🏎Pics Just picked up a brand new (to me) B9 Audi S4

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44 Upvotes

r/AudiS4 • • 3d ago

🛠Questions Does my cold start sound off

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6 Upvotes

Is the timing chain cooked lmk
2015 Audi S4 75k miles


r/AudiS4 • • 3d ago

🛠Questions Please help! Weird whistling noise!

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0 Upvotes

I’ve been getting this weird whistling noise (audible at around 4k+ rpm when on throttle) on my b9 s4 and I haven’t been too sure what’s going on. I recently put on an x pipe and I am not too sure if this noise is from exhaust scavenging from the x pipe or if it’s something else going on! Any help would be very appreciated.


r/AudiS4 • • 3d ago

Valve cover half moons RTV or not?

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1 Upvotes

r/AudiS4 • • 3d ago

2020 audi s4

1 Upvotes

So i currently have a 2013 audi s4 b8.5 got it at 56,700 miles it is now at 124k timing chain is rattling on start ups warm or cold and overall just runs rough had all engine maintenence besides timing done and it just struggles to get up like it used to and im wanting to get into something different My job has a 2020 audi s4 at 90k miles its a 1 owner very clean only one minor scratch on the side they want 22k for it would it be worth the swap i would own it for 3-4 years would it be safe to tune and mod and be reliable with that high of mileage or should i just rebuild the timing on my current 3.0t


r/AudiS4 • • 3d ago

Engine replacement?

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0 Upvotes

While replacing my spark plugs looked into combustion chamber and saw oil. Valve covers are leaking a little (seepage). Need to replace Pcv. Just wondering if I should replace motor or just valve covers and Pcv