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  1. #1
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    FAQ: Are you looking to purchase a B6/B7 S4? Here is what you need to know.

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    Okay, the amount of "Im looking into getting an S4..." threads are starting to get rather abundant. This thread is aimed at those looking to get into a B6/B7 S4. I have compiled, with help of other members, general information of the platform, differences between the models, common problems to look out for, and basic maintenance.

    If you guys think i missed something please send me a PM or email with additional information where you see fit.

    General Information

    Gas Guzzler

    The biggest and perhaps the biggest downfall to the S4 is the fuel consumption. However, what do you expect driving a V8? Here is what to expect.

    Tank Size: 16.6 Gal
    Average Per Tank: 200-250 Miles*

    *This number will not be true for every individual. As we all know the MPG and Miles Per Tank all depend on your driving style. If you are conservative and drive mostly highway, you can expect low to mid 20s. If you are on the opposite side of the spectrum and drive the car hard, expect mid teens.

    Naturally Aspirated Motor vs FI

    One of the big misconceptions of individuals looking at the B6/B7 deals with the tuning a N/A motor. To get straight to the point, the B6/B7 S4 is not a tuner car compared to the B5 platform. This car is a 4000 pound SEDAN, as much of a luxury car as it is a performance car. If you are looking for a car that you can make run 10 second quarter miles times with a minimum amount of money, then this car is not for you. There are several companies out there, such as JHM, that have made huge advances in the B6/B7 platform. These companies are making it possible to squeeze as much power out of this N/A motor as possible. However, as stated before, do not expect to get significant powder gains unless you are looking to go forced induction.

    Wiki

    We now have our own WIKI for the B6/B7 S4/RS4. Additional information about the platform can be found by following the link below.

    B6/B7 S4/RS4 Wiki

    Common Problems

    Early B6 Build Date: It is known that some early build date S4's (8/03) had some engine problems. Those problems should have occurred by now or have been fixed/replaced. Although it is a relatively big concern when purchasing a car, be aware that not all of the early builds had problems. The ones that did should of/have been fixed by now. If you are that concerned with an early build S4 either looker for a newer one or purchase and extended warranty.

    Coil Pack Failure: One of the most common issues with the B6/B7 S4 is a coil pack failure. This problem can be identified by a CEL/Flashing CEL accompanied by mis-fires and a hard idle. Coil packs cost around $30 each new. If your coil packs fail under warranty they will be replaced by the dealer.

    Common Engine Codes for a Coil Pack Failure:
    16684 - Random/Multiple Cylinder Misfire Detected
    16686 - Cylinder 2: Misfire Detected

    Starter Issues: There are several cases where the started has gone on the S4. You can most likely detect a bad started while turning the key to start the car, NOTHING will happen. Is you do not have a warranty, this can be a rather expensive repair.

    Additional Common Problems can be found via the link below. This is courtesy of Jay at JHM.

    Common Problems Continued

    Differences Between B6/B7 S4

    Mechanical/Electrical - Thanks to Jay at JHM

    Flywheels: A B6 flywheel only works with a B6 Pressure plate and the same with a B7, they bolt up to either motor though.

    Clutch Pressure Plates: A B6 pressure plate only works with a B6 flywheel and the same with a B7

    Intake Manifolds: The B6 S4 has a nice gray coating on top and the B7 S4 has a temperature resistant coating underneath where it is closest to the motor.

    Core support to motor clearance: The B7 S4 has about 1 to 2 inches more room of core support to motor clearance than the B6.

    Center Differential: The B6 S4 and the 05.5 B7 S4 only share the same center differential. The 2006 and up B7 S4 and RS4 share the same center diff.

    Appearance and Options

    2004-2005 = B6 Body Style

    2004 vs 2005 Difference

    -GPS Antenna: Notice the 2004 below (left) is larger than the 2005 (right).



    -Xenon Headlights: Single Xenon Headlights (2004) vs Bi-Xenon Headlights (2005)

    -Engine Covers: 2004 Side Engine Covers Included vs 2005 Side Covers were not included



    2005.5- 2008- B7- New Updated Body Style



    Basic Maintenance

    Below is the Audi recommended service schedule for maintenance.

    Service Schedule

    Please note that some maintenance items should be changed sooner if they are failing/and or they appear they need to be replaced. Such items include: Valve Cover gaskets, Air filter, Pollen filter, Fuel Filter, Spark Plugs, Serpentine Belt Etc...

    The wonderful Audi community here has put together a large amount of DIY's to assist owners in performing their own maintenance. These step by step guides help even the least mechanically capable owners in performing their own maintenance. If you still need help while following the DIY's, there are many members here to assist you by answering questions or giving their advice.

    B6/B7 S4/RS4 FAQs and DIYs

    Cost: Basic maintenance on the B6/B7 S4 is not one of the cheapest vehicles to own. Please be aware of this while considering your purchase. Below is an example of what to expect if you are going to maintenance by yourself.

    Oil Changes: 9.5 Quarts Ow40/5w40 + Oil Filter

    - Expect to pay anywhere from $80-$120 depending on your choice of Motor Oil and the Oil Filter

    Spark Plugs:
    8 Plugs
    - Expect to pay around $50+ depending on the spark plugs you choose. Plugs for this car range around $6-$7 per plug.

    Air Filter:
    1 OEM or Aftermarket Filter
    - Expect to pay around $20-$25 on an OEM filter

    Valve Cover Gaskets:
    Both Gaskets + Half Moon Seals + Coil Pack Seals
    - Expect to pay anywhere from $60+ for a complete set. Price varies by dealer and retailer

    There is just a general feel for the price of common maintenance items. Please note that those prices are for those of you that decide to DIY. All procedures have been documented here on Audizine. Prices may be significantly different if you decide to take the vehicle into the dealer/indy shop for maintenance issues.
    Last edited by SoCalS4Avant; 01-22-2010 at 09:34 PM.

  2. #2
    Veteran Member Three Rings 04Ultrasprt's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Great write up Joey!

    Previous rides:
    Lotus Elise - B6 S4 Cab - E90 335i - E46 ///M3 - B6 PES Stage 2 S4
    B6 Nogaro S4 - B5 S4 Stage II - B7 A4 2.0T K04 - B6 A4 1.8T USP
    USP CLUB MEMBER #95

  3. #3
    Registered Member Three Rings somethingcorp's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    YOur good!! REALL GOOD!! thanks for the bentley guide.. good for a newb like me who wants to do most of my own servicing work!!
    Jhm tune, Piggie pipes, Awe Non-res cat-back, Intake spacer, clear corner mod, custom suede trim.. more to come

    "speaking my mind isn't an act. nor is it a product of me allowing myself to be a con artist, but it is simply to express something that i suppose shouldn't be held in."

  4. #4
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    I will be updating this on a regular basis guys when i gather up more information. Hope it helps.

  5. #5
    Veteran Member Four Rings Sharkfin's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    nice job
    Past: DTM 2005.5 B7 A4 2.0TQT (sold)
    Past: 2008 Infiniti G37s Coupe (totaled)
    Past: 2007 Honda Civic LX Sedan (sold)
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  6. #6
    Veteran Member Three Rings Veereihen6's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Great job! This should defintely be stickied.
    2004 B6 S4 Avant 6MT Moro Blue - mostly stock for now
    1998 VW GTi-VR6 - mmmmm....listen to that VR6 growl! -sold-

  7. #7
    Veteran Member Four Rings drew's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    great job as usual joey.

  8. #8
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Please guys if you feel something else should be added please bring it forward. I did this quickly to get something up and posted.

  9. #9
    Veteran Member Three Rings Jdubya's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    I would add window regulators, broken glove box and saggings doors to that list.
    FI DP | FI CB | JHM IM | JHM TUNE | JHM N20 | SB STAGE III/LWFW | PORSCHE BBK | BBS CH | KONI/H&R

  10. #10
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by Jdubya View Post
    I would add window regulators, broken glove box and saggings doors to that list.
    Are sagging doors a common issue? I haven't read to much open the problem. I know the window regulators are common and the sagging/ broken glove box. I will add those when i can.

  11. #11
    Active Member Two Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Great info.

  12. #12
    Veteran Member Three Rings mad70sx's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Excellent work as usual Joey!

  13. #13
    Veteran Member Four Rings iconoclast's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    great thread...

  14. #14
    Senior Member Two Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    This is good stuff!

  15. #15
    Established Member Two Rings mitbackwards's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    solid write up! I was just thinkin there was a bunch of people looking into getting S4s...and loved how you pointed out the difference in the antennas. I was just teaching that to my girl haha

  16. #16
    Veteran Member Four Rings Beelzeebub's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Joey does it again. Two thumbs up.

  17. #17
    Veteran Member Four Rings Silver B6 S4's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Nice write-up! I thought the early build dates were pre- 10-03, not 08-03.

  18. #18
    Forum Moderator Four Rings SoCalS4Avant's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Awesome write up Joey! +1 rep.
    Dan - Moderator/Wiseguy

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  19. #19
    R.I.P. Three Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    You should also write that aftermarket intakes don't do jack for our cars, and if you want some performance upgrades besides looks, exhaust, downpipe, and chip, that they should visit JHMotorsport's page....

  20. #20
    Veteran Member Four Rings beemercer's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Another great writeup. I tried to rep you, but I've already hit my max ha ha. If I think of anything to add I edit this post.
    You represent the idiocy of today.

  21. #21
    Administrator Four Rings Anthony's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Very nice. I too would suggest making this a Sticky, but in the FAQ/DIY subforum. I'm sure a bunch of this stuff can and should be added to the AZ Wiki as well.

  22. #22
    Veteran Member Three Rings justinperkins's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Excellent writeup Joey
    -justin

  23. #23
    Established Member Two Rings Aka's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Good job, Joey. As others have said, I think this should be stickied.

  24. #24
    Senior Member Two Rings jlc59's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Excellent as usual Joey...

  25. #25
    Veteran Member Four Rings tadhgbrosnan's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Add "faulty brake light switch" to common ailments of the B6 S4. A cheap and easy fix but often mis-diagnosed b/c it drains the battery. Dealer missed it twice when it happened to me and I only learned what the real problem was after consulting veteran AZers who'd experienced it before.

    Very nice write up, btw, and I LOVE the shot of your car w/ the 19" CHs. Never gets old.


    BOUGHT 9/14/11- '08 Daytona Gray RS4/Black leather/CF trim/35% tint/Euro steering wheel/Neuspeed RSe14/GMG catback

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  26. #26
    Veteran Member Three Rings Jdubya's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by joeycuccaro View Post
    Are sagging doors a common issue? I haven't read to much open the problem. I know the window regulators are common and the sagging/ broken glove box. I will add those when i can.
    I bet people have this issue and don't know what it is. I've seen a few people try to close their door twice without thinking it's a real issue and that they just aren't closing it hard enough. My passenger door is sagging a little and takes more force to close than the others.
    FI DP | FI CB | JHM IM | JHM TUNE | JHM N20 | SB STAGE III/LWFW | PORSCHE BBK | BBS CH | KONI/H&R

  27. #27
    Veteran Member Four Rings staticuxo's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    thanks for the info, i am trying to get into an s4!

    B7 S4 AVANT- 6MT | FI 8" RES EXHAUST | FI HFC DOWNPIPES |

    B8.5 S4 - 6MT | AWE EXHAUST | ROC-EURO INTAKE | H&R COILOVERS | HRE P44SC 20x10 |AG M310 19x9.5 | YAKIMA WHISPBAR | THULE 517 |

    PREVIOUS:
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  28. #28
    Senior Member Four Rings ...Mark...'s Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    You guys should sticky this so that the newbies could ask noob'ish questions here, and we can check in periodically and help answer them. It would cut down on a shit ton of redundant threads.

    haha..

  29. #29
    Veteran Member Four Rings cellg8's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    very nice! so what's your next car?
    2014 RS5 Sepang Blue / GMG springs / Eurocode UCA / H&R 10mm spacers / Ti Grille / Euro Headlights / OEM CF Engine Cover
    2008 B7 S4 Sprint Blue / Stasis Ohlins SL / ADV10 Trackspec 20x8.5 ET 28 + 245/30/20

    '14 B8 RS5:
    http://www.audizine.com/forum/showth...571715-RS5-20F

    '08 B7 S4:
    http://www.audizine.com/forum/showth...uot-ADV1-B7-S4

  30. #30
    Veteran Member Four Rings BoostedA4tQ's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Perfect Write up as i am in the Market for an S4. Thanks.
    Last edited by BoostedA4tQ; 09-16-2009 at 11:59 AM.

  31. #31
    Established Member Two Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by joeycuccaro View Post
    Please guys if you feel something else should be added please bring it forward. I did this quickly to get something up and posted.
    Very nice write-up - Thanks for taking the time.

    Perhaps you could add something about the B6 clutch generally needing replacement around 50K miles or so as a maintence item. If you change your clutch before it actually goes then you may not need a new flywheel (which is around $1100 from Audi.

    The flywheel for the B6 has also been updated since its original design and many have failed.

    Also on the early B6s many of them had problems with bad syncros in the tranny. Not exactly cheap laborwise to fix either.

    Thanks Again.

  32. #32
    Account Terminated Four Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by Silver B6 S4 View Post
    Nice write-up! I thought the early build dates were pre- 10-03, not 08-03.
    You are correct, typo on my end. Fixed!

  33. #33
    Veteran Member Four Rings Saracen's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Great post, thanks the info! This is definitely getting bookmarked.

  34. #34
    Veteran Member Four Rings Monchichi8's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Awesome info, this should really help any and eveyone wanting to get a B6/7 !

  35. #35
    Established Member Two Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    I'm thinking a paragraph on Ipod integration, since that is a fairly popular topic.

  36. #36
    Account Terminated Four Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Some new information regarding CPO warranties and clutch replacement added. Thanks for all of the comments and rep guys!

  37. #37
    Veteran Member Four Rings Silver B6 S4's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    I also thought for appearance differences, that the trim around the windows were different. 04's, and some 05's had polished aluminum, and the later to 08 had chrome trim, maybe plated? Which led to damage from the sun, and different car wash products used on the car?

  38. #38
    Veteran Member Four Rings Silver B6 S4's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Also, the mirror caps. 04's were real aluminum, while 05-08 were plastic that is painted to look like aluminum.

  39. #39
    Account Terminated Four Rings
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by Silver B6 S4 View Post
    Also, the mirror caps. 04's were real aluminum, while 05-08 were plastic that is painted to look like aluminum.
    Updated! Good work

  40. #40
    Veteran Member Four Rings Silver B6 S4's Avatar
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    Re: Are you looking to purchase a B6/B7 S4? Here is what you need to know!

    Quote Originally Posted by joeycuccaro View Post
    Updated! Good work

    No problem!


    Also, my 04 does this:

    -Fold-in Mirrors: 2005+ S4 models had the fold in mirror option, while the 2004 did not.



    So do you mean it was standard on the 04, and an option on the 05+?

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