2013 Beetle TDI Tons of issues

[SaVAGeSoot]

Let's give this another try with hopefully the correct log. Tried cam position and it didn't seem to read any i selected, allot of the selections seemed to not show anything. These were one that were reading, engine speed, high pressure fuel rail, coolant maf, accelerator, o2, map didn't move. Didn't look at the last upload, shit happens.
https://log.tunezilla.com/s/6TxQTgvO

Bruh, quit doing random shit.
What problem are you trying to diagnose?
How do any of the things you're logging apply to whatever that problem is?
If you don't know why you're selecting whatever you choose to log, there's no point in showing the rest of us what the results are.

So let be simplify things for you a little, in order to see if you know anything about what you're posting, etc.
Let's look at the initial 20s of your graph


What do you see?
I see you giving it RPM, but I don't see any change in MAF flow and I don't see any boost (does this thing have a turbo or not?).
So, if that's the case, why is that? Is it because you don't have a MAF? Is it because whatever TUNA did causes this heap to no longer read the MAF? If the latter, then what else could it be mapped to read available air off? The MAP? Well, yours is flat AF, so why is that? Do you not have charge pipes connected?
Lastly, if your engine starts and runs (no idea if it runs good, or like crap, since I'm not there and you're not saying), I'd jump to the conclusion that this thing is pig rich at idle, and it fattens up even more as you attempt to drive it and you load it up, causing it to roll some sweet coal (hence the stack), while making it fall flat on its face under any load.

How's my crystal ball doing?

 

[Dr Sheldon]

If you came up to me and did that, I'd crush your face!

 

[JohnSayler]

Ok. On my end I see movement with the maf, not much tho, just not sure how much the numbers need to climb or where they are suppose to be, i guess i could've compared them to my maf reading in my mustang to have a better idea. Or looked at the graph, I was looking at the spreadsheet numbers, should've looked at the graph, but I'm posting most of this on my phone and the graph doesn't look right on it, hard to read. The charge pipe is not connected due to a broken oring, waiting on a new oring and didn't want to put it back together to just pull it back apart. That's my bad, I was just wanting to give some readings that might show something, but it didn't show enough with the sensors i could find to select and the lack of assembly. Oring just came in today, also got a new map just incase. I'll be checking readings tomorrow when I get it all back together and see if anything changes. The motor actually runs smooth, but possibly a little rich, idles smooth, revs up to 2900 rpm smooth with no problem, no suit, but obviously not any higher do to limp mode/ p0641. Also I hate the stack, but wife likes it. And I hope it doesn't blow tons of suit, I hate that, it's stupid. But the whole is cut in the hood and I'm not spending the money for a new egr/dpf system or should I say she's not gonna buy it lol.
I appreciate the input and patience.

 

[SaVAGeSoot]

 

[JohnSayler]

I have come to the conclusion that this car is possessed. I cleaned the maf sensor again. I put the new map in, and new oring. Also keep in mind one of the first things I replaced was the Actuator, it was getting a p00af code, tested the vacuum actuation and it had full movement so I assumed it was the electrical end of it.

Anyway. did another log.

https://log.tunezilla.com/s/5wDpo9eW

You see some movement in the map now and some in the maf, but now getting the p00af code again for the actuator, and now a new code,
Altitude Sensor / Boost Pressure Sensor P1592 - 000 - Implausible Correlation. Never seen that one as of yet.

Still has p0641 and still in limp mode. Been checking for boost and vacuum leaks, unfortunately I do not have a smoke machine at home to help in this process. Also tracing wires to find shorts or brakes, have not found any at this point. Since it starts, idles smooth, and revs to limp rpm with no issues which it actually went up another 100 rpm from previous, I am not thinking there is an issue with the cam position sensor.

 

[JohnSayler]

soot! lmao, auto correct failed me again

 

[JohnSayler]

ok, found vacuum leak, brake booster line is cracked, once i fix that hopefully p1592 a p00af will go away. back to the stupid p0641 code, after i replace the brake booster line and check to see if it gets more boost since the leak was causing problems with the n75 intern problems with the actuator.

 

[SaVAGeSoot]

Where did the MAP sensor come from? Is it OEM or some Amazon garbage?
It's clearly not a good one since it's never reading anywhere near the atmospheric pressure.

 

[JohnSayler]

Got it from the vw dealership here in town. Our atmospheric pressure here is actually about what the map sensor is reading at idle, and reading around the same as the previous sensor. But do to the lack of boost, from my research this will cause a bad reading while revving the motor, at idle it's reading almost prefect atmospheric. But when bringing the rpms up and the little to no boost not building as it should will cause the atmospheric to lower, atleast from what I've read and understand. So now that I found the vacuum leak causing the n75 to pop a code and the actuator to pop a code again, making it to where it will not create correct boost from my understanding. Once the brake booster line is replaced hopefully it'll start creating boost and get better readings.
Also verified that the wiring harness was purchased from my local vw dealer November 2025, so I'm no longer chasing wires since i could tell it was new and from what I've unwrapped trying to find damage and finding any as of yet.
Using a multimeter I was getting i think like 1.3 volts at the MAP sensor when I checked last week, power on engine off, that is too low, pointing at bad sensor, wiring or ecu failing. With the map unplugged testing the voltage at the wire harness plug, power on engine off its getting 5.8 volts, that's way too high, should be between 4.5-5 volts max, that's wiring or ecu. Knowing the wiring is good, even tho I'm getting too high of voltage now pointing back to the ecu, i replaced the map, cheaper for testing. These are the possibilities that my research have pointed to and from the post that Uwe put at the beginning. Haven't tested the tps yet, but with the weird voltage at the MAP wire, not thinking the tps is the issue.
The maf doesn't look like it's reading correctly, I've cleaned it twice, with maf sensor cleaner and air dried, just too make it clear just incase you might think I used something like brake clean. If i unplugged it, it will pop a code for it. I'll check voltage with a multimeter tonight to see what it's getting.

 

[SaVAGeSoot]

at idle it's reading almost prefect atmospheric.

So up to ~13s mark, the green and orange lines are overlapping.... GOT IT..... thank God I have an optometrist appointment tomorrow afternoon.... I clearly need new glasses!

 

[JohnSayler]

I am not understanding your sarcasm. I don't see any overlapping. My location is 1025 bar, i am only 30 meters above see level. Did this log before finding vacuum leak. The vacuum leak to the n75 and limp mode both can cause no boost or lower boost, which will cause the atmospheric to read wrong/ low as well. Am I incorrect with this? All I know is that both boost and atmospheric are both lower then they should be when increasing the rpms, which the lack of boost is from the vacuum leak, since i have not found a boost leak as of yet. is this incorrect?

 

[SaVAGeSoot]

Altitude Sensor / Boost Pressure Sensor P1592 - 000 - Implausible Correlation.

Does that say Boost Pressure Sensor / Boost Pressure Sensor - implausible correlation?
Or do you think a sensor is a sensor regardless of what it reads? Or do you think that it's telling you the same sensor isn't correlating with itself?

All I know is that both boost and atmospheric are both lower then they should be when increasing the rpms

So your engine is sucking in so much air that it's dropping atmospheric pressure?
That's one powerful TDI

 

[JohnSayler]

The P1592 code on your 2013 VW Beetle TDI means [/COLOR]there's an "Implausible Correlation" between the Barometric (Baro) pressure sensor and the Boost (MAP) pressure sensor, often caused by a faulty Boost Pressure Sensor (G31), bad wiring/grounds, boost/vacuum leaks, or issues with the N75 valve. Start by inspecting vacuum lines and boost hoses for cracks/leaks, checking sensor grounds, and examining the wiring harness to the boost sensor, as faulty wiring is a common fix, followed by the sensor itself.
Low vacuum to the N75 valve on your 2013 VW Beetle TDI causes the turbocharger's
Variable Nozzle Turbine (VNT) to operate incorrectly, resulting in underboost, significant
power loss, black smoke, and the engine entering limp mode (no boost), because the
ECU reduces fueling to protect the turbo when it can't control boost pressure. This typically
points to a vacuum leak in the lines, a failing N75 valve itself, or a problem with the turbo
actuator diaphragm, often requiring replacing cracked vacuum hoses or the valve.

This is when I found the severely cracked brake booster line had gotten worse from
when i first noticed it and wassucking air causing a bad vacuum leak. I probably cracked it more when I removed and
reinstalled the maf to clean it. That is why it was a new code. Vw is getting a new brake boost
hose coming. I could simply plug the end where the hose connects to to stop the vacuum
leak and test again. Unless i am wrong with this evaluation?

 

[SaVAGeSoot]

I didn't realize that you're one of those dudes who uses AI... now it all makes sense.
With key on, engine off, your boost sensor will read the same as baro.... if it's working properly.... if you understood what G31 does, you'd get it... but you're too focused on "I have a boost leak".

 

[JohnSayler]

Come on, seriously. I just get on the internet, type in my symptoms or codes and read the results. Wasn't even paying attention if it was ai or not. Would explain when I word it different i get a slightly different answer. Just looking for answers. Never noticed the ai logo at the top till you mentioned it. FML. Either way the massive vacuum leak is new. Also explains the new code. Do they not coincide? Would not a brake booster line vacuum leak cause problems with the n75 and intern the actuator? Causing it to cut the boost? They are all using the same vacuum pump.

 

[SaVAGeSoot]

Bro... do a single thing at a time.
I keep repeating myself. You keep ignoring me.

With key on, engine off, your boost sensor will read the same as baro.... if it's working properly....

So, if you don't understand that, turn the key on, do not start the engine, go look at what your boost sensor is reading and show us!

 

[JohnSayler]

Will do

 

[JohnSayler]

new map sensor reading with key on motor off. hopefully i did it in the correct area of vcds. By the looks of it it is junk and I need to take it back to vw and get e replacement, my luck they won't. usually don't do returns with electrical bs

Monday,19,January,2026,17:38:24:20311
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 25.3.2.0 (x64) HEX-V2 CB: 0.4671.5
Data version: 20250822 DS365.0
www.Ross-Tech.com




Address 01: Engine (03L 997 030 G)

17:38:07 Group 010: Charge Pressure Control
0.0 mg/str Mass Air Flow (actual)
1008.0 Atmospheric Pressure
1200.0 Boost Pressure (actual)
0.0 % Accel. Pedal Pos. Sensor 1 (G79)

 

[JohnSayler]

I also did the old map sensor got different results. But I am not getting the P1592 code with the old map sensor plugged in. FYI the Atmospheric pressure currently where I am at is 1025.7

Monday,19,January,2026,17:43:18:20311
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 25.3.2.0 (x64) HEX-V2 CB: 0.4671.5
Data version: 20250822 DS365.0
www.Ross-Tech.com




Address 01: Engine (03L 997 030 G)

17:42:53 Group 010: Charge Pressure Control
0.0 mg/str Mass Air Flow (actual)
1008.0 Atmospheric Pressure
1008.0 Boost Pressure (actual)
0.0 % Accel. Pedal Pos. Sensor 1 (G79)

 

[PetrolDave]

I just get on the internet, type in my symptoms or codes and read the results.

You really CANNOT place complete faith in what you see on the internet, so much now is AI generated and AI suffers from the inherent problem of GIGO (Garbage In = Garbage Out) caused by the material on which it is trained not being complete or relevant to your vehicle.

Put simply, trust expert people NOT AI!