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991 common problems and failures. Reference guide.
While I believe the at there also should be a separate, dedicated thread for the 991.1 and that they both should be stickied, I’d like to start a reference guide to gather all of this information in one place.
I propose FACTS only. Leave the potinions out and if you feel compelled to start a conversation, please start a dedicated thread for it.
Since the forum allows for it, I suggest that we also make use of the SUBJECT field in the the reply form, as to better identify the issue being reported.
{edit} Please also start your post with Year-Model-Trim of you car.
As a new 991.2 owner, I will followup shortly with the issues into which I’ve run and will post a dedicated reply for each, not a list in a single reply.
I’m hoping for a constructive collaboration from most of you.
My experience with 991.1 w/X50 Powerkit
7MT
2014 50th Anniversary Edition
75K total miles
All scheduled maintenance performed
CPO Repairs
24K miles - Replaced changeover valve due to no heat
30K miles - Both PADM dampers replaced, cooling system changeover valve replaced
44K miles - High pressure fuel pump replaced
49K miles - Changeover valve replaced due to no heat
54K miles - Rear spoiler drive motor replaced, replaced leaking manual clutch line that comes off of brake fluid reservoir
64K miles - Heat shield service campaign, fuel tank module campaign, battery replaced
After CPO Expired
69K miles - Replaced front a/c condenser due to stone damage/leak
I average 30-31 mpg on the highway in normal mode in 7th gear (manual transmission). Incredible vehicle in all respects. Still turns heads and gets comments from folks almost every drive.
2017 C2 intermittent Engine fan failure alarm. 33k miles. But only came on right after mechanic installed BMC air filter. Also doesn't seem to come on with spoiler up.
Still under factory warranty but still seeing if it reappears before acting on it. No messages left in PCM window after alarm comes in and clears. Also ran a track day and engine was perfect all day. Kept an eye on temps. Thinking it's some sort of ghost in the machine. lol
I've identified this as a useful thread, and sticky candidate, in keeping with the ongoing discussion on 991 stickies at the link below. Please carry on adding more common 991 problems and their solutions so we can build this thread further.
In particular, please would all (including the OP, @ZerOG ) note: the thread title has been emended slightly to remove the ".2" distinction. I'd like to try and use this thread to build the "common problems" list (at least for the time being) for 991's. We'll give this a try for a few months and re-evalute if any further changes (like, separate .1 and .2 threads, but I'm not really convinced) are needed.
Thanks!
Last edited by Rich_Jenkins; 10-05-2021 at 03:50 PM.
I have a 2017 (.2) Carrera Base purchased CPO the summer of 2019 from Porsche South Shore, Freeport NY.
June 2019, 20,412 miles: I got a check engine light that appeared under light acceleration in 7th passing a semi on a freeway on our return trip from NY to Tampa after buying the car. The fault cleared after our trip. The fault reappeared two weeks later, while I was driving to work, again, in 7th, under light acceleration.
Took it in, and the Dealer diagnosed the issue as faulty tank vent sensor. It was replaced under warranty, N/C. Part was 9A2-110-095-01 AS TANK VENTILATION (Reeves Porsche Tampa).