Coding 992
Instructor
Joined: Dec 2022
Posts: 139
Likes: 36
Hi everyone, long time lurker first time poster. Thank you for this and all the other related threads, they have me, at least, inspired to the tune of buying everything including one of these awesome 120A power supplies.
I've got piwis 41.500 + diag 38.250 up and running and talking to my 2025 992.1 Turbo S. Things more or less seem to be working fine until I get to the F7 - Add. Menu area. Once that loads up everything is listed under value group "PR Numbers" and the coding values (e.g. 0P9) are all enumerated there except that they are all "unknown I-no.". If I go scrolling for the control values related to matrix headlights I can see the expected US values. But, unlike in simulation mode, there's no dropdown menu. It's as though piwis has no idea what these coding values are and especially what the options might be.
The piwis image I have was originally in E mode. I switched it to P mode and started getting prompted to create a val. I said yes to this but after ~30 minutes being hung on, iiirc, "finalizing report" I gave up and aborted it (which also hung and I simply rebooted everything).
Is this as simple as not having a new enough version of piwis? Or have I missed a step somewhere?
I've got piwis 41.500 + diag 38.250 up and running and talking to my 2025 992.1 Turbo S. Things more or less seem to be working fine until I get to the F7 - Add. Menu area. Once that loads up everything is listed under value group "PR Numbers" and the coding values (e.g. 0P9) are all enumerated there except that they are all "unknown I-no.". If I go scrolling for the control values related to matrix headlights I can see the expected US values. But, unlike in simulation mode, there's no dropdown menu. It's as though piwis has no idea what these coding values are and especially what the options might be.
The piwis image I have was originally in E mode. I switched it to P mode and started getting prompted to create a val. I said yes to this but after ~30 minutes being hung on, iiirc, "finalizing report" I gave up and aborted it (which also hung and I simply rebooted everything).
Is this as simple as not having a new enough version of piwis? Or have I missed a step somewhere?
I was told by several people that you should never use P mode (Production mode). because there is high chance you can brick the car.
E mode is Entwickeln (development) mode, not Engineering Mode as many people say. Engineering start with Ing- in German.
V mode is Verkäufe mode.
anyway, you get different menu in V mode (or Normal model, no V doesn't mean normal, but PIWIS use the term "normal mode" too) compare to E mode (Development mode).
and sometimes V mode is more comprehensible and useful, depending on vehicle model and year.
ie, E mode is not always better or more menu options.
so try V mode, and see if those items are identified with names, rather than just "unknown"
Last edited by simhoppm; Oct 29, 2025 at 02:30 PM.
Burning Brakes
Joined: Aug 2020
Posts: 828
Likes: 247
I asked the sales guy at the Dealership if they can disable start/stop funcion on my 992, and he flat out said no, it can't be done.
I did not believe him, but I gues he was telling the truth after all.
I guess I have no choice but to disable it every time I start the car.
I did not believe him, but I gues he was telling the truth after all.
I guess I have no choice but to disable it every time I start the car.
only way is to get a tune and have the tuner disable. They hard code it
Rennlist Member
Joined: Mar 2022
Posts: 4,241
Likes: 3,247
From: Florida
Instructor
Joined: Dec 2022
Posts: 139
Likes: 36
July 29, 2025
If finalized, this proposal would remove all greenhouse gas standards for light-, medium- and heavy-duty vehicles and heavy-duty engines, starting with EPA’s first greenhouse gas set in 2010 for light-duty vehicles and those set in 2011 for medium-duty vehicles and heavy-duty vehicles and engines—which includes off-cycle credits like the much hated start-stop feature on most new cars.
I'm pretty sure dealers will offer services to disabled start/stop in near future for a small fee.
Burning Brakes
Joined: Aug 2020
Posts: 828
Likes: 247
Check this out. Removes start/stop w/o a tune. https://www.midcityengineering.com/modelock/
I rather get a tune then chopping wire up
Rennlist Member
Joined: Dec 2009
Posts: 536
Likes: 571
From: CA
Heads-up about Matrix headlight coding:
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
Rennlist Member
Joined: May 2021
Posts: 8,990
Likes: 7,689
From: Southern California and Nevada
Heads-up about Matrix headlight coding:
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
Last edited by M3Inline6; Oct 31, 2025 at 03:02 PM.
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Rennlist Member
Joined: Dec 2009
Posts: 536
Likes: 571
From: CA
It is a free and unintended effect of Matrix LED headlight coding. Will take some digging to see which exact value that controls this behavior between EU and US settings.
Rennlist Member
Joined: Jul 2023
Posts: 859
Likes: 495
Do the brake lights flash in their entirety? EU cars flash hazards under hard/emergency braking, which may look like brake lights for US.
My motorbike flashes hazards for a few seconds during super hard braking. It's an Italian bike (Aprilia) though.
My motorbike flashes hazards for a few seconds during super hard braking. It's an Italian bike (Aprilia) though.
Rennlist Member
Joined: May 2021
Posts: 8,990
Likes: 7,689
From: Southern California and Nevada
Rennlist Member
Joined: May 2021
Posts: 8,990
Likes: 7,689
From: Southern California and Nevada
I don’t know that my Duc V4 does that, but now I’m curious.
Rennlist Member
Joined: Jul 2023
Posts: 859
Likes: 495
Instructor
Joined: Dec 2022
Posts: 139
Likes: 36
Alicar claims to have Piwis 4 Version V43.300.022 + V38.250 , but who knows how trustworthy that is.
Last edited by simhoppm; Oct 31, 2025 at 08:09 PM.
Rennlist Member
Joined: Apr 2012
Posts: 390
Likes: 233
From: philly
Heads-up about Matrix headlight coding:
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
The method shared above will also make your brake lights flash during hard braking (Euro setting) which is illegal in the US.
[insert long discussion about which is safer, better and value of risking a fixit ticket vs being rear-ended and add statistical and anecdotal references and feelings about if flashing brake lights really really makes a difference]
which method?
has anyone coded matrix diy yet or everyone pays these guys online 1500$ to unlock it ? which is absurd.