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View Full Version : FAQ: Are you looking to purchase a B6/B7 S4? Here is what you need to know.



joeycuccaro
09-15-2009, 06:34 PM
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 (http://www.audizine.com/forum/showthread.php?t=278805)

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 (http://www.audizine.com/forum/showthread.php?t=280205)

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).

http://www.audizine.com/gallery/data/500/Antenna_Difference.jpg

-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

http://www.audizine.com/gallery/data/500/Joey-VC5.jpg

2005.5- 2008- B7- New Updated Body Style

http://i8.photobucket.com/albums/a49/tipling/RollingshotofmyS4.jpg

Basic Maintenance

Below is the Audi recommended service schedule for maintenance.

Service Schedule (http://www.bentleypublishers.com/images//tech/audi/audi.2005.main.pdf)

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 (http://www.audizine.com/forum/forumdisplay.php?f=164)

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.

04Ultrasprt
09-15-2009, 06:59 PM
Great write up Joey!

somethingcorp
09-15-2009, 06:59 PM
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!!

joeycuccaro
09-15-2009, 07:07 PM
I will be updating this on a regular basis guys when i gather up more information. Hope it helps.

Sharkfin
09-15-2009, 07:12 PM
nice job

Veereihen6
09-15-2009, 07:35 PM
Great job! This should defintely be stickied.

drew
09-15-2009, 07:37 PM
great job as usual joey.

joeycuccaro
09-15-2009, 07:40 PM
Please guys if you feel something else should be added please bring it forward. I did this quickly to get something up and posted.

Jdubya
09-15-2009, 07:44 PM
I would add window regulators, broken glove box and saggings doors to that list.

joeycuccaro
09-15-2009, 07:47 PM
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.

Euconect
09-15-2009, 08:02 PM
Great info.

mad70sx
09-15-2009, 08:18 PM
Excellent work as usual Joey! [up]

iconoclast
09-15-2009, 08:20 PM
great thread...

Sixer
09-15-2009, 08:28 PM
This is good stuff!

mitbackwards
09-15-2009, 08:35 PM
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

Beelzeebub
09-15-2009, 09:00 PM
Joey does it again. Two thumbs up.

Silver B6 S4
09-15-2009, 09:10 PM
Nice write-up! I thought the early build dates were pre- 10-03, not 08-03.

SoCalS4Avant
09-15-2009, 09:13 PM
Awesome write up Joey! +1 rep.

sway
09-15-2009, 09:14 PM
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....

beemercer
09-15-2009, 09:52 PM
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.

Anthony
09-15-2009, 09:54 PM
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. [up]

justinperkins
09-15-2009, 11:08 PM
Excellent writeup Joey [up]

Aka
09-16-2009, 02:44 AM
Good job, Joey. As others have said, I think this should be stickied.

jlc59
09-16-2009, 05:17 AM
Excellent as usual Joey...

tadhgbrosnan
09-16-2009, 05:44 AM
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.

Jdubya
09-16-2009, 05:59 AM
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.

staticuxo
09-16-2009, 06:10 AM
thanks for the info, i am trying to get into an s4!

...Mark...
09-16-2009, 07:59 AM
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..

cellg8
09-16-2009, 08:10 AM
very nice! so what's your next car?

BoostedA4tQ
09-16-2009, 08:51 AM
Perfect Write up as i am in the Market for an S4. Thanks.

samq45
09-16-2009, 11:36 AM
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.

joeycuccaro
09-16-2009, 11:41 AM
Nice write-up! I thought the early build dates were pre- 10-03, not 08-03.

You are correct, typo on my end. Fixed!

Saracen
09-16-2009, 11:53 AM
Great post, thanks the info! This is definitely getting bookmarked.

Monchichi8
09-16-2009, 12:28 PM
Awesome info, this should really help any and eveyone wanting to get a B6/7 !

gearsnshafts
09-16-2009, 12:41 PM
I'm thinking a paragraph on Ipod integration, since that is a fairly popular topic.

joeycuccaro
09-16-2009, 06:12 PM
Some new information regarding CPO warranties and clutch replacement added. Thanks for all of the comments and rep guys!

Silver B6 S4
09-16-2009, 08:27 PM
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?

Silver B6 S4
10-02-2009, 11:57 AM
Also, the mirror caps. 04's were real aluminum, while 05-08 were plastic that is painted to look like aluminum.

joeycuccaro
10-09-2009, 12:30 PM
Also, the mirror caps. 04's were real aluminum, while 05-08 were plastic that is painted to look like aluminum.

Updated! Good work

Silver B6 S4
10-09-2009, 06:32 PM
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+?

joeycuccaro
10-09-2009, 06:53 PM
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+?

Really you have them in the 2004?

Silver B6 S4
10-09-2009, 07:35 PM
Really you have them in the 2004?


Yup, here's a pic of my build date and a crappy video.


http://i34.tinypic.com/v5kap4.jpg







View My Video (http://tinypic.com/r/200pn4p/4)

joeycuccaro
10-09-2009, 07:52 PM
Yup, here's a pic of my build date and a crappy video.


http://i34.tinypic.com/v5kap4.jpg







View My Video (http://tinypic.com/r/200pn4p/4)

Damn, alright i guess i have to take that out then. Fail on my part!

Silver B6 S4
10-09-2009, 08:51 PM
Damn, alright i guess i have to take that out then. Fail on my part!


Your 04 didn't have this option???

stix123123
10-12-2009, 06:00 PM
Also, the mirror caps. 04's were real aluminum, while 05-08 were plastic that is painted to look like aluminum.


This isn't true. I have a late 2004 and the mirrors are plastic.

joeycuccaro
10-12-2009, 09:45 PM
Your 04 didn't have this option???

Nope [down]

Sharkfin
10-12-2009, 09:46 PM
Joey, when in your intro thread coming [:D]

fujii13
10-15-2009, 01:53 PM
I have an '04 and have the folding mirror option as well. And my mirrors are not plastic, either.

rjpeaks
10-22-2009, 08:31 AM
Thanks - very informative!

Mahalo

krellio23
11-06-2009, 09:20 AM
Joey, excellent review of the b6 and b7 S4. I actually replaced my valve cover gaskets last week at 65,000 miles, they were leakin a bit too much for me to handle. Will there be any major differences between running 5w 30 instead of the recommended 5w 40 oil? Also, the factory says 10,000 miles between oil changes (due to synthetics) but are they flippin crazy? I can't leave oil in an engine much after 5,000 miles no matter what anyone says. Any ideas? Ever seen the auxillary radiators leak at all? Your post was a great help, nice work

joeycuccaro
11-16-2009, 08:36 AM
Joey, excellent review of the b6 and b7 S4. I actually replaced my valve cover gaskets last week at 65,000 miles, they were leakin a bit too much for me to handle. Will there be any major differences between running 5w 30 instead of the recommended 5w 40 oil? Also, the factory says 10,000 miles between oil changes (due to synthetics) but are they flippin crazy? I can't leave oil in an engine much after 5,000 miles no matter what anyone says. Any ideas? Ever seen the auxillary radiators leak at all? Your post was a great help, nice work

I would suggest 5w40 instead of the 5W30.

Disregard the 10k oil changes. I also never let me oil go over 5,000 miles. I usually do it every 3k miles in my S4.

I have seen some coolant leaks from the radiators. It is usually the hoses that leak or the seals that connect the hose and the radiator together.

EYE4SPEED
11-17-2009, 06:18 PM
Great info... now can you make one for the RS4? I'm looking to upgrade soon (or whenever I unload the cabbie which may not be so soon). Thanks.

joeycuccaro
11-20-2009, 06:21 AM
Great info... now can you make one for the RS4? I'm looking to upgrade soon (or whenever I unload the cabbie which may not be so soon). Thanks.


I will look into it! Might be a bit harder since i dont own one! [:D]

ALWAYS4UDI
11-28-2009, 10:13 PM
joey, i'm looking at getting an s4.

i just wanted to let you know. lol

joeycuccaro
11-29-2009, 08:46 AM
joey, i'm looking at getting an s4.

i just wanted to let you know. lol

Good stuff! Read up [:D]

Trevor Ely
01-03-2010, 01:59 PM
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?

So, only the '04s had trim that wasn't as affected by the sun/harsh cleaners? I assume B7s also have this troubled plastic trim?

krellio23
01-04-2010, 04:39 PM
Great write up Joey. One very small thing you may have looked over is that the early model B7 S4 (2005.5 and 2006) seem to have issues with the brake light switch failing. This causes your rear lights (brake lights) to light up when the car is off thus draining the car battery quickly. Its a good thing to replace before you end up stranded in frigid temps. Thanks for the great list

Naudi04
01-19-2010, 02:05 AM
I randomly stumbled across this post and learned something new about my S4 (side mirrors fold in). That's pimp shit.

Thx Silver B6 S4 (we have the same build date, and car as it seems :)

mpunklil
01-22-2010, 03:31 AM
Im really sorry, but im confused. Im not a complete newb to forums, as Im on quite a few...but Im just not seeing the list?? Am I supposed to click on something? sorry im lost lol

Matt@EuropaParts
01-22-2010, 10:03 AM
Heh, no worries, I'm not seeing it either (on either account). I thought it was just a fluke with the VAG-COM DIY below this, but apparently I was mistaken.

Any specific questions we can help out with?

Jer
01-22-2010, 11:00 AM
Great write up Joey. One very small thing you may have looked over is that the early model B7 S4 (2005.5 and 2006) seem to have issues with the brake light switch failing. This causes your rear lights (brake lights) to light up when the car is off thus draining the car battery quickly. Its a good thing to replace before you end up stranded in frigid temps. Thanks for the great list

Is it the switch itself that was a poor design and if so can it be swapped with the newer style from the newer cars for prolonged reliability or is it just the fact that those cars are older and the later years will experience it just as frequently as they age?