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958 Cayenne DIY: Battery Compartment Access


958 Cayenne DIY: Battery Compartment Access

Old 01-13-2019, 04:24 AM
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Can we get some clarification on the need to do battery registration?
The mechanic at the Porsche dealership was very adamant about it having to be done.

Just installed a Duralast AGM and things seem fine so far, but why was the mechanic so adamant about doing this?
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Old 01-15-2019, 02:34 PM
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Battery registration not required.
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Old 01-16-2019, 03:27 PM
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Originally Posted by Cyrus951 View Post
..but why was the mechanic so adamant about doing this?
Was 'the mechanic' doing it for free? If so, let 'em!

Otherwise, well, surprise, they want to do it because they take money from you to do it.
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Old 01-17-2019, 07:02 PM
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Originally Posted by wkearney99 View Post
Was 'the mechanic' doing it for free? If so, let 'em!

Otherwise, well, surprise, they want to do it because they take money from you to do it.
The mechanic is following directions for something he's supposed to do as the manual states programming after a battery change is a necessary process.
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Old 01-19-2019, 06:23 PM
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Just wanted to say thanks for this thread! Not sure I would have figured it all out myself. Wasnĺt too difficult except for that freaking cover and those damned spring clips! The back two are difficult to pop. And the cover is tough to get put without a little effort as the carpet is in the way.

My guess is the Porsche procedure is to pull the seat completely and just reset the resulting airbag light.

Oh and as for coding the battery, I did a swap in my 991 a year ago and didnĺt code and have had no issues.
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Old 01-29-2019, 12:34 AM
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My 2014 Cayenne S needs a battery, I've fallen down this rabbit hole. My local dealer is quite specific (both service advisor and head mechanic) that if I do not use only a Porsche OEM Austrian battery, with the serial number and part number, AND the device that detects the battery installed, that nasty things will happen. I will not be able to register the new battery (I found a good Interstate AGM for $240) AND that many features on the car will not work. The smart charging function will not work (the alternator will put full charge voltage across the AGM even if it doesn't need it) and the automatic start/stop function will fail due to erroneous voltage readings within the ECM/power system.

BTW I tried to use a Snap-On OBD Ethos system to find the registration within the system today, and no luck. Seems like it only works with a Porsche OBD reader?

I'm finding this whole thing to be rather crazy. First Porsche puts a battery under a seat that needs 2 1/2 hours of labor (Porsche) or a minimum one hour (local shop) to remove/replace battery. Second, the OEM battery is no way near as good of a battery as the ones on the market (Interstate will guarantee the AGM for 3 years, expect 8-10 years service life; Porsche 2 year limited guarantee, 5 year service life). Third, APPARENTLY, the system is designed to force an owner to buy OEM just to keep car legal within extended warranty AND to work many electronic systems.

Oh, did I mention about $850 for Porsche to r/r the battery?

So can anyone really tell me what is true and what is false. Will a "regular" battery work for other than just starting the car? Is registration of a new battery required? Will the lack of a OEM battery detect reading (it was there in the Snap-On system, apparently it is real) cause failures and faults?
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Old 01-30-2019, 01:21 AM
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The factory battery is actually fine(replaced mine after 8 years and it was still going strong), they are just selling it for a crack pipe price. 2.5 hours labor is a total joke. Took me maybe 45 minutes going slow the first time doing it.

Replaced mine with a platinum AGM from Advance a few months ago. All the electronics work fine, zero faults or failures yet. Plenty of people on here using aftermarket batteries, haven't heard of a single reported issue yet.
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Old 01-30-2019, 04:07 PM
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Folks, I'm closing this thread now - commentary such as above really should be done in the normal Cayenne forum, not here. Here is where people come for specific instructions. Chatting about dealer policies and lies they tell you are better shared with everyone over in the main forum. More eyes will see it on the main forum, and it will bring threads such as the one this DIY was made from back to the top - meaning they are still valuable.
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