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-   -   Scan Gauge II XGauge - EGT & Boost (

compu_85 August 9th, 2012 14:41

Scan Gauge II XGauge - EGT & Boost
We've gotten a couple questions about how we put EGT on our ScanGauge II, so I'll make a quick post.

I got this information from here:

Here is the best information to monitor on your Passat...

EGT1 (pre-turbo): This is useful for monitoring warm-up mode and temps going into the turbo. This will change very rapidly as you change the accelerator position.
TXD: 07DF0178
RXF: 054106780000
RXD: 3810
MTH: 00090032FFD8

CAT B1S1: This is useful for monitoring regeneration activity. Anything over 900F is a regen.
TXD: 07DF013C
RXF: 0441053C0000
RXD: 2810
MTH: 00090032FFD8

Boost pressure: This is useful for monitoring boost pressure. You should see 0 PSI with the ignition on and the engine off. You should see a max of 23.0 PSI on a stock tune.
TXD: 07DF0170
RXF: 054186700000
RXD: 3810 (4810 for a model year 2015)
MTH: 00910BB8FF64 (for sea level - you'll need to adjust the last 4 digits if you live at altitude in order to get to 0 PSI with the ignition on and the engine off. Also note that the baseline will change with atmospheric pressure as you change altitude.)

Water Temperature: This is useful for monitoring actual water temperature
This is a normal gauge - no XGAUGE required, just cycle through the presets.

Personal note: I watch both exhaust temp sensors listed above and wait for both to be below 450F before shutting off the engine.

For information on how to program an X-Gauge, read page 38 on the Owner's Manual here:



BarnyardsTDI August 9th, 2012 14:52

Amazing!!!! When I get one,I must try!

bigred 7.3l August 9th, 2012 15:50

Thank you for the info. Very helpful.

vw_norm August 10th, 2012 00:26

The scan gage is a slick device. I also purchased a Y cable, removed the OEM diagnostic plug from its holder in the trim panel and was able to secure one end of the Y into the original diagnostic plug's space with a zip tie and attached the other end to the scan gage and then to the OEM port. This is all tucked up on top of the trim panel and the cable to the scan gage passes through the gap in the dash next to the steering wheel. It sits perfectly on the lower lip of the instrument pod with a velcro strip. This does not interfere in any way with the vagcom communications unless you try to do something with the scangage while the vagcom is trying to read the car controllers.
It is very easy to tell when your DPF is being regen'd. That sucka gets HOT! I've been trying to figure out the boost reading, DSG temp, oil pressure, etc to name a few. The codes for the boost gage follow a sequence, and I plan to check the measuring blocks in the vagcom to see if there is any correlation to find more points to program as X gages.

mrctdi August 10th, 2012 05:13

Got any pictures of your install. That sounds really nice...

compu_85 August 10th, 2012 06:30

I have the scan gauge wedged between the defroster and the windshield. I'll take a pic later today.


VeeDubTDI August 10th, 2012 11:20

As far as I know, you won't be able to get boost or intake air temp to work. The ECU reports those values in a non-standard manner. IAT is reported as a voltage in VCDS and manifold pressure is reported in micropascals, which is pretty easy to convert to PSI, but I don't think the scangauge will pick it up (we've tried a few different things). Neither seems to display anything over OBD - at least not on the channels that we've tried to program on SCII.

compu_85 August 11th, 2012 17:45

Someone asked how we have our scan gauge mounted, here are some pictures:

The wire runs between the dashboard and the windshield, around the tweeter, behind the cover for the fuse door, then pokes out right by the OBD port. No dangling wires :cool:


vw_norm August 13th, 2012 00:29

Here's where I installed my scan gage - right between the speedo and tach on the little lip on the dash. I can see it right across the top of the steering wheel air bag housing:
Ran the interconnection cable in the gap between the steering column and the dash on the left side:
I also purchased the Y cable ( that allowed the removal of the diagnostic port from the under dash trim panel and inserted one end of the Y cable in the trim panel, secured with a zip tie so it doesn't push out when plugging in my vagcom cable. The OEM diagnostic port plugs into the common leg of the Y cable and the Scan gage into the other leg. This does not interfere with Vagcom unless I try to reprogram the scan gage when Vagcom is also hooked up:
The scan gage cable and the OEM diagnostic port is all tied up under the dash on the air vent support strut (sorry for not taking a pic before I zipped everything up):
To keep the Scan gage in place, I made a little Z bar from some 0.010 brass shim stock and epoxied it to the rear of the scan gage. Lined it with Velcro to match up with the Velcro on the lip of the instrument pod, and I'm good to go:

ChadS99SVT August 17th, 2012 10:50

how hard is this install? does it void warranty or anything? I'm thinking of picking one up.

VeeDubTDI August 17th, 2012 11:02

Easy - it plugs into the OBD port under the dash. It will not void the warranty by any stretch of the imagination. Money well spent.

ChadS99SVT August 17th, 2012 11:06


Originally Posted by VeeDubTDI (Post 3903762)
Easy - it plugs into the OBD port under the dash. It will not void the warranty by any stretch of the imagination. Money well spent.

ok and more specific to this thread to get the EGT readout. It doesn't require a special temp sensor to be installed correct?

I think I am going to order one. any reason the get the Y adapter? Is that just so I don't have to remove the scan gauge from the port should soemthing else need the OBDII port?

VeeDubTDI August 17th, 2012 11:07

It uses one of the existing temperature sensors. You program an x-gauge into the ScanGauge unit and it displays that sensor's readings.

Only reason to get a Y cable is so that you can plug in two devices at the same time (example: ScanGauge and VCDS simultaneously).

Knarrly Viking August 17th, 2012 11:29

Wouldn't it be nice if VW had this functionality already installed with the car? All the ScanGauge is doing it reading the information that the car already has. No new sensors, just a few more lines of code to allow the data to be displayed to the driver. Instead, we just get an indicator after the problem has occured, not that there might be a problem brewing. I'm an engineer and retired Navy guy, so I like to see data and trends to know how my system is operating, whether it's a submarine, car, motorcycle or computer.

tdiatlast August 17th, 2012 11:30 want a truly functioning temperature gauge, too? How quaint...

I don't go anywhere in any vehicle w/o my scangauge hooked up...

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