EGR / VVT Readiness Monitors on 991.1
10-13-2022 | 04:37 PM
#16
Instructor
Joined: Jun 2022
Posts: 109
Likes: 33
For resetting a 991 drive cycle to reset the EGR flag.
You will need to drive on a freeway for 10 min, exit on the longest off ramp you can fine and let car coast ( no braking ) to a full stop. You will need to do it multiple times normally 2-3 times to reset the EGR flag.Your AC needs to be in the on position during this process. You can have your code reader plug into the car to view the EGR flag being reset.
You will need to drive on a freeway for 10 min, exit on the longest off ramp you can fine and let car coast ( no braking ) to a full stop. You will need to do it multiple times normally 2-3 times to reset the EGR flag.Your AC needs to be in the on position during this process. You can have your code reader plug into the car to view the EGR flag being reset.
12-06-2022 | 03:25 PM
#17
Rennlist Member
Joined: Feb 2022
Posts: 29
Likes: 3
From: San Diego
BLUF - use PIWIS to run the car through the VVT cycle
I was having the same issue in my 991.1 2016 GTS (manual cab) not getting a pass on the EGR monitor. I believe this was due to disconnecting the battery to install an aftermarket steering wheel about 2000 miles before smog was due. All monitors but EGR reset during normal driving. After a couple attempts utilizing the drive cycles mentioned in this thread I bit the bullet and took the car to a shop. The shop used their PIWIS to cycle through the VVT programs (took 10 minutes) and that reset the EGR monitor. They charged $50.
I was having the same issue in my 991.1 2016 GTS (manual cab) not getting a pass on the EGR monitor. I believe this was due to disconnecting the battery to install an aftermarket steering wheel about 2000 miles before smog was due. All monitors but EGR reset during normal driving. After a couple attempts utilizing the drive cycles mentioned in this thread I bit the bullet and took the car to a shop. The shop used their PIWIS to cycle through the VVT programs (took 10 minutes) and that reset the EGR monitor. They charged $50.
12-06-2022 | 03:54 PM
#18
Instructor
Joined: Jun 2022
Posts: 109
Likes: 33
Me too. 2013 C2S EGR/VVT. Took it the dealer after driving the bajeeezus out of it to try to reset them. $260 dollars later I was good to go. Hoping I’m not having to go through that again next time my car needs smog?
12-08-2022 | 03:43 AM
#19
Advanced
Joined: Nov 2017
Posts: 55
Likes: 16
From: Campbell, CA
Quick heads up having just been through this in CA on my 50th (essentially a 991.1s with X51)
I spent multiple weekends doing every drive test to try and get the readiness set without luck.
the OBDII reader didn't mention any faults so i just gave up and sent it into Porsche to have them set it.
Turns out during their diagnosis an O2 sensor was faulty and needed to be replaced. This wasn't throwing any codes and they had to spend a day or so hunting the issue down as they couldn't get it to set easily as well.
hindsight is 20/20 but if i had just brought it to the dealer to begin with i would've saved myself many many hours and about 500+ miles of driving lol.
I spent multiple weekends doing every drive test to try and get the readiness set without luck.
the OBDII reader didn't mention any faults so i just gave up and sent it into Porsche to have them set it.
Turns out during their diagnosis an O2 sensor was faulty and needed to be replaced. This wasn't throwing any codes and they had to spend a day or so hunting the issue down as they couldn't get it to set easily as well.
hindsight is 20/20 but if i had just brought it to the dealer to begin with i would've saved myself many many hours and about 500+ miles of driving lol.
Last edited by daxbox; 12-08-2022 at 03:44 AM.
05-11-2023 | 10:56 PM
#20
1st Gear
Joined: May 2023
Posts: 1
Likes: 0
BLUF - use PIWIS to run the car through the VVT cycle
I was having the same issue in my 991.1 2016 GTS (manual cab) not getting a pass on the EGR monitor. I believe this was due to disconnecting the battery to install an aftermarket steering wheel about 2000 miles before smog was due. All monitors but EGR reset during normal driving. After a couple attempts utilizing the drive cycles mentioned in this thread I bit the bullet and took the car to a shop. The shop used their PIWIS to cycle through the VVT programs (took 10 minutes) and that reset the EGR monitor. They charged $50.
I was having the same issue in my 991.1 2016 GTS (manual cab) not getting a pass on the EGR monitor. I believe this was due to disconnecting the battery to install an aftermarket steering wheel about 2000 miles before smog was due. All monitors but EGR reset during normal driving. After a couple attempts utilizing the drive cycles mentioned in this thread I bit the bullet and took the car to a shop. The shop used their PIWIS to cycle through the VVT programs (took 10 minutes) and that reset the EGR monitor. They charged $50.
05-12-2023 | 01:57 AM
#22
Rennlist Member
Joined: Feb 2022
Posts: 29
Likes: 3
From: San Diego
Performance Independent
6035 Fairmount Ave, San Diego, CA 92120
(619) 563-5927
https://maps.app.goo.gl/qBSFCu1Hm4dWVCbw8
6035 Fairmount Ave, San Diego, CA 92120
(619) 563-5927
https://maps.app.goo.gl/qBSFCu1Hm4dWVCbw8
05-12-2023 | 02:01 PM
#23
Racer
Joined: May 2010
Posts: 332
Likes: 15
My car is a 991.1 50th.
Ugh, this seems common for whatever reason. I had the same issue, drove the car close to 1k trying to get it into a ready state. Did all the tricks mentioned in this thread, driving 50mph for x-distance, coasting to a stop, etc. All of this is way dangerous on freeways since people drive faster than 50! I was doing this at 6am on weekend mornings too. Complete waste of time and added mileage to the car (they weren't fun miles!)
Finally broke down and brought it to the dealer. $500 later it passed. I know they just hooked it up to the computer to force it into a ready state. We need to figure out what the "secret test" is to force it into a ready state. There's a couple of suggestions in this thread to run the cam test. Hopefully that's it!
I just had another smog test, and it passed. I would be PISSED if I had to bring it in every 2 years @ $500 to have it pass smog. Hoping the car battery never dies as that will reset the computer for sure!
Ugh, this seems common for whatever reason. I had the same issue, drove the car close to 1k trying to get it into a ready state. Did all the tricks mentioned in this thread, driving 50mph for x-distance, coasting to a stop, etc. All of this is way dangerous on freeways since people drive faster than 50! I was doing this at 6am on weekend mornings too. Complete waste of time and added mileage to the car (they weren't fun miles!)
Finally broke down and brought it to the dealer. $500 later it passed. I know they just hooked it up to the computer to force it into a ready state. We need to figure out what the "secret test" is to force it into a ready state. There's a couple of suggestions in this thread to run the cam test. Hopefully that's it!
I just had another smog test, and it passed. I would be PISSED if I had to bring it in every 2 years @ $500 to have it pass smog. Hoping the car battery never dies as that will reset the computer for sure!
05-12-2023 | 02:39 PM
#24
Rennlist Member
Joined: May 2014
Posts: 3,040
Likes: 1,039
From: Los Angeles
My car is a 991.1 50th.
Ugh, this seems common for whatever reason. I had the same issue, drove the car close to 1k trying to get it into a ready state. Did all the tricks mentioned in this thread, driving 50mph for x-distance, coasting to a stop, etc. All of this is way dangerous on freeways since people drive faster than 50! I was doing this at 6am on weekend mornings too. Complete waste of time and added mileage to the car (they weren't fun miles!)
Finally broke down and brought it to the dealer. $500 later it passed. I know they just hooked it up to the computer to force it into a ready state. We need to figure out what the "secret test" is to force it into a ready state. There's a couple of suggestions in this thread to run the cam test. Hopefully that's it!
I just had another smog test, and it passed. I would be PISSED if I had to bring it in every 2 years @ $500 to have it pass smog. Hoping the car battery never dies as that will reset the computer for sure!
Ugh, this seems common for whatever reason. I had the same issue, drove the car close to 1k trying to get it into a ready state. Did all the tricks mentioned in this thread, driving 50mph for x-distance, coasting to a stop, etc. All of this is way dangerous on freeways since people drive faster than 50! I was doing this at 6am on weekend mornings too. Complete waste of time and added mileage to the car (they weren't fun miles!)
Finally broke down and brought it to the dealer. $500 later it passed. I know they just hooked it up to the computer to force it into a ready state. We need to figure out what the "secret test" is to force it into a ready state. There's a couple of suggestions in this thread to run the cam test. Hopefully that's it!
I just had another smog test, and it passed. I would be PISSED if I had to bring it in every 2 years @ $500 to have it pass smog. Hoping the car battery never dies as that will reset the computer for sure!
It's not a secret, if you have a PIWIS you can force the car into a drive cycle to get monitors to readiness. Just make sure the car has proper ventilation. I have done this with my PIWIS 2. There is a section on the tool to run through the various drive cycles.
05-12-2023 | 06:38 PM
#25
Racer
Joined: May 2010
Posts: 332
Likes: 15
I had access to a PIWIS. Tried all the diff cycles as well, nothing would work. So I assume there's some secret sauce for that last specific sensor. No one really was sharing what the specific test/process to run to get the car ready.
05-13-2023 | 04:52 PM
#26
Rennlist Member
Joined: May 2014
Posts: 3,040
Likes: 1,039
From: Los Angeles
I know for a fact there is a VVT readiness set on the PIWIS I have run it. Perhaps you could have a VVT solenoid that is starting to go bad which is a common failure and it's not allowing you to pass readiness for VVT?
05-31-2023 | 09:04 AM
#28
Racer
Joined: Mar 2015
Posts: 255
Likes: 2
‘15 GTS… having the same challenges. Does anyone know if a COBB tune would interfere? I’m hesitant to bring to my local Pcar dealer to reset the flags as they would not pass me for the safety check (due to a switchpath exhaust) but a local gas station passed me with ease. Plus there is also the voluntary ECU update for emissions that I am hoping to avoid being applied…
06-26-2023 | 03:35 PM
#29
Track Day
Joined: May 2008
Posts: 21
Likes: 6
ERG/VVT resolved
I am experiencing the same issue after changing the battery on my 50th. Tried numerous drive cycles without any luck. Can you tell me which dealer resolved your issue? There was a mention of Livermore Porsche. Thanks
06-27-2023 | 01:22 AM
#30
Instructor
Joined: Jun 2022
Posts: 109
Likes: 33
I used Livermore Porsche to reset my car. I think I paid $265?