GT3/GT2 Performance and Track Discussion on the Porsche GT3 and GT2

991.1 GT3 with fault P0491, P0305, and slight oil leak

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Old 05-24-2021 | 09:11 AM
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991.1 GT3 with fault P0491, P0305, and slight oil leak

Hi Guys!

i recently acquired my first porsche a 991.1 GT3 i got last Oct. looking forward to being a part of this community!

I have apt scheduled with Porsche first week of June but i wanted to post what was happening

So yesterday driving i received a CEL with code P0491 Secondary Air Injection System Insufficient Flow Bank 1 & P0305 Cylindar 5 misfire detected (car was in limp mode but driving was permitted)
- Upon moving the car after, i saw a few drips of oil near the rear passenger side of the engine.

Any ideas? or any one experience this? I will post updates from the dealer as i get them.


 
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Old 06-04-2021 | 06:31 PM
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Any aftermarket parts on the car?
 
  #3  
Old 06-18-2021 | 01:46 PM
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Originally Posted by andyrichter
Any aftermarket parts on the car?

Just a Soul Performance Center Muffler Delete (read manly places this shouldn't have an effect on things)

Update:
Oil Leak was a gasket.

I dropped it off. Initially they said one of the flaps on the muffler valves was stuck open.

They fixed that along with replacing all the plugs (i opted for it since recommended by technician).

Car drove fine but still threw the same code.

Now my local Porsche Dealer is recommended the walnut blast cleaning of the intake valves etc because the system had carbon build up.

This wont be covered by Porsche's extended warranty

but also the warranty i purchased (extended; highest plan available as well) will not cover it either because they said its not "mechanical failure of a part"

This is kind of a nuisance because i paid for the best warranty plan to avoid this hassle lol.

My dealer is doing whatever they can to have it covered but my extended warranty company just had me flip to the page of the contract of where it lists everything it doesnt cover. :/

Im waiting to hear back currently from my service advisor.

So to sum up:

Completed:
Exhaust flap fixed
Spark Plugs replaced
Gasket Replaced

Suggested (not complete):
Walnut Blast Cleaning

I read other similar posts of someone having their secondary injection pump replaced and that resolving the problem

Will update when i hear more news back

hopefully this can help someone else in the future as well.
 

Last edited by RKMGT3; 07-07-2021 at 06:15 PM.
  #4  
Old 07-07-2021 | 06:17 PM
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Final Update with resolution as of now:

I received the car about 4 days ago.

They walnut shell cleaned the passage ways.

Car runs better than ever; no codes at all.
 
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