Questions & Answers

Planet-9 FAQ

Here you can find answers to questions about how the board works. Use the links or search box below to find your way around.

How should I “break-in” my Cayman?

It is recommended that you follow what Porsche AG instructs in your owner's manual. Doing otherwise, you do so at your own risk. Check your owner's manual. 

(note: please ... if you do not follow the manual and have break-in issues, please do not post in the complaints forum).


Breaking in new cayman
Break-in Period

Why does my fuse blow when I use the compressor?

Check your owner's manual. The tire compressor is to be used ONLY in the cigarette lighter outlet.

Can I get a spare key for my Cayman?

Yes. They Cayman S key comes in two parts: the base key (#997-538-931-00 ~$130 list price) and the key head 315 MHZ (#997-637-244-37, ~$180 list price). You will also have to have your dealer program the key which may include an additional cost.


Replacement key
Valet Key

How can I stop my battery from dying when it sits for a week or more?

There have been examples of cars batteries dying after sitting without being driven for some number of days. Part of the reason may be because some electronics, such as the alarm, are always drawing electricity. Porsche also suggest you always remove the key from the ignition, switch off unnecessary electrical loads during short trips or idling and to turn off electric drawing devices within five minutes of shutting off the car. Check your owner's manual for further details. The manual clearly indicates that the remote in the key will not operate if the car is not started or opened within five days to prevent the battery from running down.

Porsche sells “Porsche Charge-o-mat II battery charger”, a battery maintainer that can be plugged into a cigarette lighter outlet and be used to maintain the battery. It should be available from any Porsche dealer. Boothe Design, a Cayman Club Sponsor, sells a similar type battery charger (see this thread).


Battery Maintainer

Need a battery maintainer

Battery died after 12 days

Help! Car Won't Start - Key Stuck Too!!

Is buying the Tire Insurance sold by my dealer a good deal?

This is a personal preference and is an issue of cost versus benefit. Dealers may offer some kind of insurance. If you purchase tire/wheel insurance, be sure to read the fine print. There may be an option, at the discretion of the insurance company, to plug rather than replace the tire regardless of what Porsche may recommend. 

Insurance coverage may vary by company including the length of the insurance and costs. In deciding whether to buy this insurance, consider the cost of a new tire, installation and the possible replacement cost of a new wheel. This should be weighed against what you believe the chances are of having multiple flat tires or to replace a wheel, the costs of the replacements and the cost of the insurance.  Only you can decide if buying this coverage is a good deal for you. 


Tire & Wheel Insurance

Road Hazard Wheel Insurance Worth it!

1st bobo last night

Will adding aftermarket parts, either performance or not, effect my warranty?

Read your warranty. Parts not authorized by Porsche may not be covered. If you make a modification that causes a Porsche part to fail, your dealer may not repair it under warranty. If you have a dispute, Porsche provides for arbitration (see the manual for further details). Consumers are also protected under the Magnuson-Moss Act.

Is adding racing stripes to my Cayman a good idea?

Car graphics is a personal decision. 

Will racing in a “timed event” void my warranty?

Read your warranty, a copy may be found here. Parts that fail during racing or Driver Events may not be covered by the warranty. You might also want to read your auto insurance policy. Racing in a timed event may also preclude coverage for your vehicle.

Do I have to buy N-spec tires?

See your owner's manual. In the US they must not only be N-Spec but the SAME specification code. For more information see Porsche N-Specification Tire Approvals.

How do I get a spare tire? 

The Cayman does not come with a spare tire in the US. The Porsche spare tire is made by Vredestein called the Space Master. The size is 185/60-17 93P.  You can see the correct fitment at their website here. Vredestein does not sell these tires direct to consumers. You must buy them through an authorized dealer. Part #s follow (prices are estimates of full list price):

996-772-101-00 Emergency Wheel Insert ~$70

996-721-211-00 Scissors Type Jack ~$208

996-362-202-04 AS Folding Spare ~$834

996-361-411-00 Belt for Tire ~$32

996-361-521-00 Tire Boot ~$15

(note: you might want a means to secure the tire in the front boot so it does not move while driving. It is presumed the "Belt for Tire" will do that and your dealer may need to install it).

You might also want to consider where to put the flat tire after you remove it. It will not fit in either the front trunk nor the hatch. It "might" fit in the passenger seat. It may be a good idea to get a tire bag (or some kind of plastic bag) to put the flat tire in to not soil the passenger seat.

When will Porsche give the Cayman more power?

There is much discussion and many opinions on this. Only Porsche AG itself can answer this question. A wise course of action may be to ignore all Internet rumors and just wait until Porsche makes an official announcement.

Are 20” or more wheels a good idea for the Cayman?

The Cayman S is comes standard with an 18" wheel with 19" optional. 19" is Plus One sizing. 20" is Plus Two sizing (See this article for information of the concept of plus sizing). Bigger wheels are a personal choice. Read your manual about using aftermarket wheels not approved by Porsche.

What wax should I use on my Cayman? (lots of luck answering that one)

There is no simple or easy answer for this. There is far more to detailing a modern car than simple waxing. It can include a complete range of products from using claybar to different levels of polish (depending upon how badly the clearcoat requires it) to glaze to the "wax" itself. This is beyond the scope of the FAQ and it is suggested you begin researching it by reading this site. The decision to use a synthetic wax versus carnauba is a personal choice. Since this is a personal decision, you should read a detailers forum, like the referenced website, and formulate your own opinion.

Some popular carnauba waxes include: Glasur, Pinnacle Sourveign, and PS21. A popular synthetics is Zaino (there are many others). 

Note: no wax is either endorsed or recommended by this website


"Waxing" the AS

Waxing too much?

I'm nesting.....

Turtle wax ICE...

new owner seeks advice

Cleaning Products

7 hour detail today


and many others ...


A popular way to assist in the polishing and waxing of a car is to use an orbital buffer.




How To Use Porter Cable 7424 - Article

Porter Cable Orbital Polisher Question

How much will an oil change cost me at the dealer?

Dealers prices may vary. It is not possible to put a price of this. If going in for an oil change, you might want to specify exactly what services you want performed.

How much will a service cost me at a dealer?

Prices may vary by dealer and region but more there are more services than an oil change so one should expect a price more than an oil change.

How can I make my halogen headlights brighter?

The US DOT sets the maximum wattage that can be used in halogen bulbs for autos. A discussion on the federal regulations can be found here A good reference that debunks various lighting myths can be found here Since there are legal limits on wattage, one way to maximize halogen light output is described here with the use of +50 bulbs (note the referenced Osram Silver Stars are not the same as the Sylvania SilverStars commonly sold in the US).

What are the MAJOR problems areas with Caymans to date?

You can find any TSBs here. There are no know major problems areas. Some minor problems areas noted by multiple members have been. Some early cars used 400 cell catalytic converters that results in a SES light. Your dealer can fix this under warranty with a 600 cell converter.


Minor Issues:

Key Fob Issue (Porsche TSB 3669)

DIY Article: Key Modification 

I hate the factory keyfobs

Trunk Clunk

Trunk Clunk Repair with Rubber O Rings
Trunk Clunk Question
No more clunk in the trunk
Porsche - Stopping the Hatch "Clunk"

General Complaints

Worst thing about the Cayman?

My oil indicator is a few bars down.  Should I add oil?

See your manual. Each bar represents .4L. If your at the minimum mark, then your down 1.2L or about 1.26 quarts. Measure on a flat surface. Follow the recommendation in your manual. If your at the bottom level, you should add oil.

Can I replace my OEM radio with an aftermarket head-unit and if so, how?

Yes, you can replace your OEM radio with an aftermarket radio, but the complexity of the process depends on whether you have the standard audio system, sound package plus audio system, or the Bose audio system.  The standard audio system and the sound package plus do not rely on the MOST fiber bus for signal relaying, so changing your head-unit is simple and requires no rewiring of the audio system.  However, the Bose sound system is powered by a proprietary amplifier that only accepts MOST signals and uses low-resistance speakers; therefore, in order to change the head unit you will no longer be able to use the Bose amplifier and must use in-line resistors to connect the speakers to a new amplifier or directly to the head-unit.  You will not be able to retain all of the speakers in the Bose system.

For details on how to wire your new head-unit and more installation instructions, please visit the following threads.

Brain Surgery Tomorrow Morning

AVIC D3 Installed!!!

(Note: This is for information purposes only. Make aftermarket changes at your own risk.)

Can I upgrade my factory sound system with a new amplifier or new speakers while keeping the factory head unit?

Yes, there are ways to upgrade your sound system while retaining the CDR24 or the PCM head-unit; however, the difficulty and cost of doing so depends on whether you have the standard, sound package plus, or Bose audio system.  Because the standard audio system and sound package plus audio system use analog signals, they are the easier to re-amplify.  However, adding amplification will require new wiring in the car, especially with the sound package plus that is powered by two different sources. While changing speakers without adding amplification is possible with these two systems, you will not notice an improvement in sound quality over the current CDT treated-paper cone speakers because the problem is not speaker quality, it is the lack of power.

In order to upgrade the Bose system and maintain the current head-unit, you would have to use in-line resistors for the speakers and add a line-signal processor after the Bose amplifier in order to acquire an analog signal.  You would be unable to retain all of the speakers. 

Past attempts at upgrading amplification and speakers have had poor results because of the signal processing of the car’s head-units, which turns down bass and treble as the volume gets high in order to protect the under-driven speakers.  Users that have done the upgrades have eventually resorted to using a new head-unit and a whole new audio system.  However, several users have had success with adding a subwoofer in order to improve the sound of their systems and you can see the following threads for more information on doing so. 


Added a subwoofer

Drivers Door Wire Harness Drivers Door Wire Harness

Subwoofer short:

An easy way to improve bass-response for your standard or sound package plus audio system is to add a subwoofer.  The most commonly installed unit on this website is the Kenwood KSC-SW1 unit, because it is small enough to be installed behind the driver or passenger seat, or lay flat above the engine compartment.  Also, the amplifier in the unit is small enough to be powered from the fuse typically used to power the Bose amplifier.  However, other companies such as Infinity and Pioneer also make powered and non-powered shallow-enclosure subwoofers that you can add to the Cayman.  Just remember, a non-powered subwoofer will need an external amplifier, and large amplifiers will have to be powered directly from the battery.  A subwoofer is very simple to wire into the existing audio system. You have to splice into the rear-left and rear-right speaker wires as they come out of the head-unit.  These leads are located on the brown, plug B and the pin-out is as follows:

1 - R/R +

2 - R/R -

3 - F/R +

4 - F/R -

5 - F/L +

6 - F/L -

7 - R/L +

8 - R/L -



Added a Subwoofer

What should I look for in buying a used Cayman?

Now that the Cayman has been available for a few years, previously owned and leased cars are available in the used car marketplace. When considering the purchase of a pre-owned Cayman, the best insurance available is to have the car inspected by a competent, professional Porsche technician (i.e., a Pre-Purchase Inspection or PPI). A PPI will help the buyer avoid hidden damage or excessive deferred maintenance. Porsche dealers will usually be the most familiar with recent model cars like the Cayman and may be the best choice for performing a PPI. Additionally, Porsche dealers have the proper diagnostic equipment, Porsche Integrated Workshop Information System (PIWIS), to view the vehicles recorded information and service records. Independents will normally not have a PIWIS. Key items to ask for are ECU recorded engine over-revs and Porsche provided maintenance. For obvious reasons the PPI may give better confidence if done by someone other than the seller.

Like any other used car purchase, the buyer should request that the PPI cover the basics such as steering, brakes, transmission, and clutch as well as inspection of the engine compartment for any signs of fuel, oil or coolant leaks. Particularly important with Caymans are parts that are considered to be normal wear and tear items to be replaced at the owner’s expense such as the battery, tires, brake rotors and brake pads. These should be evaluated for remaining useful life to avoid unexpected expenses.

The buyer should also request that all factory recalls or Technical Service Bulletins (TSBs) be up-to-date prior to the purchase. Also ensure that all factory accessories and keys (including the wheel bolt security adapter) are included in the purchase.

The buyer should request that the seller provide a written disclosure of any aftermarket parts or accessories that have been added to the car. Modifications usually do not increase the value of the car unless the buyer views them as important. Performance modifications may hurt future resale value in a Porsche so it is important to understand any changes from stock that have been made before finalizing the purchase. If routine service was provided by the owner or through an independent mechanic the buyer should expect receipts and service records that document such service.

Make sure to get a written copy of the inspection report, including the estimated costs for any necessary repairs the vehicle needs. The buyer should make sure that he is aware of the warranty time remaining as well as what is covered under the warranty.

As in any other used car purchase the buyer should also perform his/her own visual inspection and test drive the car while comparing the car to other examples.

What should I look for in taking delivery of the Cayman/Boxster?

Many first time buyers of Porsches will find that there are specific differences from what they may be used to in other cars that they have owned. Many of these differences can be addressed while taking delivery of their new car. The following are some Cayman and Boxster delivery suggestions to be aware of as well as other common sense items to check.

First, in order to prepare for taking ownership it is recommended that new owners read the Owner’s Manual on-line first (your can find it in our files section). In particular, take note of the differences between Porsches and other cars that you may not be used to (e.g., ignition of the left, rear fog lights, parking lights).

Before you pick up your car:
  • If you prefer a different tire than the one delivered now is the time to ask the dealer if he is willing to swap them with another car in his inventory.
  • Make sure that the dealer goes to the extra trouble to clean the wheels of all Cosmoline. It is difficult to do yourself without removing the wheels.
When you pick up your car:
  • Check the tire air pressures against what it say on the door. Often they are delivered over inflated.
  • Don't sign the paperwork until you are satisfied with the paint/bodywork.
  • Leather surfaces should all fit tight without any bulges are loose parts.
  • Compare the list of options to your expectations (especially if the car was ordered to your specifications) to ensure that all are there.
  • You should receive two keys. Also check to ensure that the tool kit includes the lug nut lock adapter and other supplied tools.
  • Make sure all the lights, wipers, radio and other features work and that the sales person informs you on the proper use of their controls if you are not familiar with them.
  • The on-board computer (OBC) controls several features such as setting a speed limit warning, TPMS learning, changing to different tires/wheels, gas mileage and so on. Make sure that you get instructions on the proper use of the OBC from your sales person.
  • If you get PCM, make sure the sales person goes over how to use the GPS.
  • If you want the doors to lock when you reach a certain speed have the dealer program that at delivery. Now is the time to get DRLs programmed if you want DRLs. The key can also be programmed for a longer delay time. If you want that done now is the time. The service department may charge for these if done later during routine service.
  • Pay attention to the delivery speech given by your sales person. The urge to start driving often means important information is missed.
  • Remember to get Porsche roadside emergency contact information (1-800-Porsche).
  • Have your insurance documentation with you when you drive away.
  • Consider joining the Porsche Club of America (PCA). In addition to finding events and people to enjoy your new car with dealers will discount certain services and parts up to 10% for PCA members.
  • Some sales people give “freebies” to buyers and some do not but if you want a free cap or key fob ask now. If you don't ask, then you get nothing. You should expect at least a half a tank of gas and most times the car will be delivered full.
  • If (when) you stall you must move the key all the way back to the left before restarting (and remember the key is on the left).
  • Talk to the service manager. Introduce yourself. Find out the costs of services for an oil change, a minor service and a major service. That way you won't be in for a shock later.
After you get your car home, now is the time to sit down and reread the manual you should have already read before picking up the car.

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