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Hi chucklong --- welcome to Renntech.org, glad it's been a helpful resource. Consider becoming a contributing member, it's the best $25 I ever spent for my Cayenne S ('04). And I actually contributed an additional $25 I was so impressed with the site, Loren and other members. It's an amazing community. To your exhaust vapor question -- DC is a humid area, not sure if that has something to do with your issue. Upon start-up and for a few miles I see vapor as well. Have you been on a long extended high-speed drive yet? I drove from San Francisco to Los Angeles and back a few weeks ago (the Cayenne is a great road-trip vehicle). Temps ranged from mid 30's (F) to 70's. In California the highest octane gas I can usually purchase is 91 (Shell). Vapor emissions in the beginning of trip/cold engine, was normal, once underway no more vapor, even after stopping to fuel-up in the mountains at night in the cold but the vehicle was quite warm at that point. I see many types of Cayennes's around in California and have not noticed an undue amount of vapor emitting from their exhausts relative to other vehicles. But I have not observed Cayenne's in cooler more humid locations. Although recently in Tahoe (high elevation) in very cold weather I saw a few Cayennes and Touaregs and none had undue vapor emissions but again, that's a high desert, low humidity type of locale. My Cayenne has more initial vapor than other vehicles I've owned (Subaru's, VW's, etc.) but it has a larger displacement engine than vehicles I've owned in the past. And in a very recent discussion in this forum RFM (he's a a classic example of how knowledgeable and professional Renntech members are) noted, "...remember that a cold engine gets soaking wet inside until fully warmed up (approx. 10 to 15 Km normal driving). This is therefore a normal phenomenon." Oil Leak Over Intake Pipes Congratulas on your Cayenne and keep us posted on your findings!

Mudman2 (a very savvy contributing member here on Renntech.org) has it detailed. See pic. The URL is: http://gallery.rennlist.com/cayennegallery/Adding-mObridge-Unit-to-PCM The CTEK is a charger but once plugged-in (and only while it's plugged-in) it should offset battery-based power imbalances and function, in some ways, as a fully charged battery. When I first bought my Cayenne ('04 S) I sat in the vehicle for hours, engine off, ignition on, CTEK plugged in so I could learn about every detail without draining the battery or idling the engine. All the PCM settings, preferences, TPMS, seat settings, etc, etc, etc. Basically I read the entire manual siting in the car.

Removing your PCM is not as bad as you think. Search the forums and you'll see the removal details. And the removal tools are not too expensive. Also, even though your second battery may not be the cause of the issues you are dealing with you might consider replacing it to rule it out. It sounds like it's time to replace it anyway. The two batteries have, as noted by others who know a lot, distinct roles for the vehicle, but they are in the same overall super-set loop and a severly compromised battery may impact electrical component operation. Also plug in a CTEK overnight and leave it in -- then with the engine off but the key in and turned on try the PCM and all the reset options.

What error codes are you getting? Also, how old is the battery you did not replace?

Thanks for the update -- glad you got it working. Enjoy your new car!

Agree with bleo -- you need to know your source for data and media and ideally it's only true original Porsche spec. Otherwise you can brick/ruin your entire PCM system. You may want to PM mudman2, he's very much on top of his game as it relates to navigation issues.

I have an '04 S and have used the front (passenger footwell) and rear seat lighter sockets with my CTEK 3300 and no problems. Have not yet tried the rear cargo area sockets. Have you tried your front or rear seat sockets?

How old is your main vehicle battery Or batteries if applicable.

Looks great! Thanks for following-up and posting the pics.

Hi -- Like Rizzo I have an '04 Cayenne S and I went through some alignment questions as well when I bought the vehicle (used/CPO) in early 2009 with 56k miles. Not sure if your Silverado comparison is apple-to-apples. It's a very different vehicle from the Cayenne, even with large wheels. Cayenne's have a significantly shorter wheelbase which may make road/surface irregularities (crowns) more pronounced compared to a longer wheelbase vehicle. Also tire width is a big part of the puzzle. Be sure to confirm your tires are OK, no sidewall weakness, etc. As to your steering-wheel centering issue I don't think that would impact physical driving dynamics but I'm not sure.. Welcome to Renntech and congratulations on your Cayenne purchase -- you'll love it! (And be sure to join Renntech as a contributing member -- you can read all the Cayenne Technical Service Bullitens as well as access a slew of other data.) On a similar topic last December I noted the following in a post related to alignment: > "Sounds normal -- roads have more of a crown/camber than you may be aware. Also, Cayenne's have wide tires -- that width makes the crown more pronounced. I too thought I had an issue -- a friend suggested I find a long level and flat surface. I did (a large mall parking lot on Superbowl Sunday) and at speed (55 - 65mph) no pulling left or right or correcting steering required. From what I've read Cayenne's (or any heavy vehicle) with wide sport wheels and tires are more prone to "drive down the crown" on roads with significant crowns, requiring corrective steering. I have the stock 275/45/19" wheels. Also I've noticed no problem on freeways -- they are not as crowned as rural or suburban two-lane roads" >

Hi -- the wiring for the two power sockets above the left (facing forward) front passenger foot well under the dash can easily be accessed. For pix and info search here for, "changing pollen filter" and you'll see the details. I changed my filter and from what I recall all it required was one torx bit (size 20?) and a 5.5mm allen head to pop the lower dash section. Once that section is off the wiring is all there, easy to access, next to the pollen filter housing. One of the two power sockets may be switched -- you can test them both prior to pulling the lower dash section to determine if yes/no switched. The fastest method (but not the most elegant ) is to use the wiring above one of the power sockets to power your Zoombak. It would render the socket useless -- but there are two sockets so at least one will remain operational for other uses. Or you can patch into the wiring and loop off a spur to power the device. Plenty of nooks and crannies in that area to physially house the Zoombak. A small Velcro strip should be fine to secure it. Another solution -- and possibly better because it places the Zoombak higher up with less interference and physically closer to the outside which is what you want so the device can receive GPS signals and broadcast signals to cellular -- is to place your decvice (if it fits) in the sunglasses holder up between your visors above the windshield/rear-view mirror -- or Velcro it to the upper windshield -- just make sure it not blocked by the windshield thermal layers. For power you can leverage the Homelink wiring. That too is all covered here on Renntech.org -- search for, "homelink and radar detector" and it should show up. Let us know how it goes!

Hi -- There is a more detailed system reset here in the posts. I forget the details but it involves the key and other steps. If you search I think you can find it. Also, for overall electric and PCM problems a new battery(s) may be in order.

Agree -- sounds like drive-shaft issues. You can rule it out by getting under your vechcie and pulling the shaft shaft -- if it's loose you'll know it.

Mudman has all the detail posted and lots of info in the forums exist here on Renntech.org. Mobridge is the way to go. I'm working my nerve up to install in my 2004 Cayenne S. PS: Become a contributing member. The best $25 you can spend on your Cayenne. And, as you can read on the home page, hosting fees are going up.

A full system reset can't hurt -- disconnect the battery (both if you have two) for a few minutes. I've read about some PCM ghosts being removed via full resets.

No more or less than what the costs are for maintaining other Cayenne styles. You can search the forums for all this info. -- GTS is a normally aspirated vehicle so rule-out some of the turbo costs although the GTS has higher compression ratios than other V8's (such as the S). If you become a contributing member here you can access all kinds of maintenance documents and cost summaries -- very helpful and valuable info. Edit: fixed typos

I agree with mudman2 -- for an '04 if you have not replaced the original battery suggest you do immediately -- and NelsonMX's water tip is also excellent. Keep us posted!

Hi -- if you become a contributing member you can download manuals, technical service bulletins, etc.

Very cool! Any way you can scan the letter or take a pic of it and post here? Be sure to remove your name and info before you post. Thx.

You should be in good shape -- and $1k plus warranty is fine, do it and move on. New shaft plus you already took care of the coolant pipes means you should be rolling along with no problems. Until your coil packs fail! :) Mine did but it's a fast and cheap fix. I have new coil packs and new shaft but not the metal coolant pipes... PS -- become a contributing member -- it's worth it. The best money I ever spent on my Cayenne was becoming a contributing member on Renntech. ($25)

Happened to me as well -- if not under CPO just have an indy mechanic do it and move on. Not worth the time, money and hassle to fight.

Not sure if you're looking at your coolant pipes... And unless they are leaking or malfunctioning in some way your CPO cannot be used to drive a replacement. If so, let us know -- there will be a line in front of your dealer!

Hi -- like Loren noted check out the TSBs. (And be sure to become a contributing member -- it's worth it alone just to access the TBSs.)

Also, the recommendation is to shift gears yourself -- steering wheel or the gear selector, not left in auto. (You can read this in the manual.) And don't short-shift as you may strain your engine. Be sure to engine brake via your gear selection so you don't rely solely on brakes. It's basically all common sense -- be aware and alert (descending, cross winds, when in reverse, and if up steep hills be sure you're in the proper-gear/power-band so you don't lug/strain you engine. And it's key you load the trailer properly -- no unbalanced fore/aft, left/right loads and also secure everything inside the trailer so no shifting occurs under hard baking, acceleration, cornering, etc. Also be sure your tire inflation is proper both Cayenne and trailer. For mirrors, you should be OK, but once the trailer is on be sure you can see what you expect to see. If not, there are some solutions -- temporary mirror extenders, etc. Be sure you thoroughly inspect the trailer before you drive off with it. You want to be sure it's been maintained, the tires are OK, lights work, etc. Sometimes trailers are returned and then rented out too quickly to be serviced/maintained. Have a fun and safe trip. Like folks have said, Cayenne's are solid tow vehicles.

Hi, Welcome to Renntech.org: You can search your option codes here: (basically enter the codes from your Cayenne (the picture you took has them) and you'll find if you have TPMS or not. http://www.renntech.org/forums/index.php?app=options&do=cayenne http://www.renntech.org/forums/index.php?app=options&do=cayenne2