After changing my cam position sensors last weekend, I left one of the airbox connectors unsnapped which caused the CEL to come on. Realizing what I probably did, I poked around and found the not-completely-clicked connector and plugged it in. But realizing how many types of codes I could possibly get on this car, I decided to buy something that should be able to properly read the codes, reset them when needed, and possibly help with some diagnosis, so I got the X431 thingy. A couple of drives after connecting the sensor back up, the CEL went away, but of course I did a scan when the X431 arrived. Results showed the codes below. It's important to note that I took the car to the dealer about 300 miles after I got it to get another professional set of eyeballs on it so that I could start to formulate a maintenance plan based on more information than I had time to collect myself. They gave me a 20 page document showing the status of all the systems, who made them, what software version they were on, etc... No codes shown at that point. Now we're about 300 miles later and I had the following codes when the X431 showed up (no CEL on at this time):

• Control Unit Fuel pump (N118):
  • P254000 Low Pressure Fuel System Sensor Circuit Range/Performance (possibly fuel filter)
• P012D Turbocharger/Supercharger Inlet Pressure Sensor A Circuit High
• a206 The current vehicle identification number is incorrect or not present
• 9561 The PIN for theft protection is wrong or not present (please don't try to steal my head unit)
• Central Gateway(CGW[ZGW]):
  • U103888 Communication with the diagnostic CAN bus has a malfunction. Bus OFF
• C156E00 Calibration of the vehicle level was not performed (this is related to the headlamp module)
• Driver Side SAM (N10/1):
  • B181E2A The sensor for the engine hood has a malfunction. There is no signal change.
  • B221D49 The rain sensor has a malfunction. There is an internal electrical fault.
• Keyless Go(N69/5):
  • B1F8C14 The upper sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open circuit.
• Parktronic (N62)--360 degree camera:
  • UD14786 Communication with the control unit "Head unit" has a malfunction. There is an incorrect signal.

I reset all of these and will see which ones come back. P2540 and P012D are back already for sure.

I know a lot of people would wish they didn't have the Launch thingy so they could remain blissfully unaware since the car still drives fine and there are warnings on the dash, but I feel good having some more warning.

I didn't intend to ask any questions here, since I haven't put much legwork into this stuff myself yet, and most of these codes are probably BS/old, but I have spent some time trying to figure out where/what the turbocharger inlet pressure sensor is and where it can be found. Mercedes apparently doesn't call it this, or I'm a dumbass.

Compared to the W211, the W212 feels like a launch vehicle in system complexity (perhaps not one designed to any airworthiness standards)...

 

the engine runs right and that's great but none of these fault I would ignore except the CGW perhaps.

KeylessGo is not essential but it causes battery drain and that rains troubles on the while chassis

The fuel pump, Turbo and F-SAM are high up on the top list.
🤞

 

The Launch tool should have stored the health report or given you the option to "share" it to yourself by email. Did you do any of that? It's always important to note which codes are STORED and which are CURRENT before erasing them. The CURRENT ones should come back right away (you may have to drive a little) and those are the ones to focus on.

I'm surprised the calibration code did not return UNLESS a calibration was performed and the code was not cleared. The hood code is probably due to the hood being open when you ran the scan.

I am curious about the 20-page report from the dealer. Was this a Mercedes dealer or just the place you bought the car from?

 

Make it a HABIT to always tell the DTC is STORED or CURRENT when you post it in the forum

A simple battery disconnect or a relay removed at the wrong time..... can give you STORED codes enough to scare most people


Chuang wrote :
Compared to the W211, the W212 feels like a launch vehicle in system complexity (perhaps not one designed to any airworthiness standards)...

Wait till you see a W213 and with a 48V system dumb-azz el-cheapo hybrid engine.

 

Error codes, when they occur en masse, often seem cascaded. That is, one fault causes a second fault, that ripples into a third fault, etc. When my battery died a year ago, it took me three iterations to clear all the codes after replacing the battery.

 

Codes notwithstanding, enjoy the Launch. I've had my X431V+ for about 5 years now and use it surprisingly often on my small fleet of cars and trucks, friends, family, and even a little bit for work. So far I have yet to run into something it won't do.

 

Yep, totally agree.

It was the Mercedes dealer. I just told them I wanted them to run a diagnostic scan, run the self-compression test, and give me the report. And they did that (for $250).

I tried to get the report but my wifi wasn't strong enough and it couldn't do it, so I snapped some photos. I only got photos of a few of the codes on the same page where it showed the code status, so I lost some info there inadvertently...

 

I re-scanned today after about 25 miles of driving. The persisting codes are:

• Rain/Light sensor (RGLS)
  • B221D49 The rain sensor has a malfunction. There is an internal electrical fault. (CURRENT and STORED)
• KOMO/mbrace -Communication Module Telematics Servies/Emergency call system
  • B15D814 The cable for audio muting has a malfunction. There is a short circuit to ground or an open circuit. (STORED)
• Driver-side SAM - Front Signal Acquisition and Actuation module (N10/1)
  • B221D49 The rain sensor has a malfunction. There is an internal electrical fault (CURRENT and STORED)
• Keyless GO (N69/5)
  • B1F8C14 The upper sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open circuit. (CURRENT and STORED)
  • B1F8D14 The lower sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open circuit. (STORED)
• Parktronic (N62) --360 Degree Camera
  • U014786 Communication with the control unit "Head unit" has a malfunction. There is an incorrect signal. (STORED)
• ECM - Engine Control Module (ME)
  • P012D00 Pressure sensor upstream of the turbocharger has a short circuit to positive. (STORED)
• FSCU - Control Unit Fuel Pump (N118)
  • P254000 The signal for the pressure sensor of the low-pressure fuel circuit is implausible. (CURRENT and STORED)

Some of these have different descriptions because there are two places to read them in the interface and they give them in slightly different ways. Interesting that stored codes would be showing when I just did the reset. Also interesting that the lower sensor of the rear switching module is now STORED when it wasn't even a code before. Keyless GO works perfectly fine including the touch to lock and unlock functions. Also the rear camera works fine as well.... The rain sensor also works kinda OK. It worked better on the W211, but it definitely still functions on this car...

 

Make your phone a Personal Hotspot and connect to that if you are out of your home network WiFi range. You may want to go into Settings and Data and see if the Health Report is stored there.

 

You said the report from the dealer showed NO CODES. I have a hard time believing these faults showed up in only 300 miles. I'd be more than a little upset after handing over $250 for a bogus report. How can you even trust the compression test? (By the way, the compression test is done electronically using XENTRY. I really doubt they removed spark plugs and hooked up a pressure gauge.)

 

Given the depth of the detail, I definitely trust it. And yes, they did the electronic compression test using XENTRY--that's what I asked them to do. They ran it 4 times and gave me a printout of each one. They also sent me a video made by the tech telling me what he did and also showing some stuff he found in the engine bay. The video even started with a shot of my VIN. I don't go to the dealer for anything other than this one thing (maybe also if I needed a new key?), but it's a thing I'm willing to pay them for when I get a new car.

The report must be at work but when I find it, I'll post some snippets.

 

I was able to find the first scan in Settings->Data. I'll update the first post to reflect the code status...

 

Doesn't seem like I can edit a post after it's been read, so here are the codes from first scan, with status. I missed some in the OP.

• P254000 Low Pressure Fuel System Sensor Circuit Range/Performance (CURRENT and STORED)
• P012D Turbocharger/Supercharger Inlet Pressure Sensor A Circuit High (STORED)
• a206 The current vehicle identification number is incorrect or not present (STORED)
• 9561 The PIN for theft protection is wrong or not present (STORED)
• U103888 Communication with the diagnostic CAN bus has a malfunction. Bus OFF (STORED)
• C156E00 Calibration of the vehicle level was not performed (this is related to the headlamp module) (STORED)
• B181E2A The sensor for the engine hood has a malfunction. There is no signal change. (STORED)
• B221D49 The rain sensor has a malfunction. There is an internal electrical fault. (CURRENT and STORED)
• B1F8C14 The upper sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open circuit. (STORED)
• B1F8D14 The upper sensor of the rear switching module has a malfunction. There is a short circuit to ground or an open circuit. (STORED) (I forgot to note this the first time)
• UD14786 Communication with the control unit "Head unit" has a malfunction. There is an incorrect signal. (STORED)
• B15D814 The cable for audio muting has a malfunction. There is a short circuit to ground or an open circuit. (STORED)
• B142E31 The GPS antenna has a malfunction. The signal is not present. (CURRENT and STORED)

Some of these things seem like they might be intermittent, given that they'll apparently pop up in a short time but with a stored status... Interesting that my GPS was actively throwing a code but it hasn't thrown it again...

 

Well, it sounds like they did a thorough job. I just don't understand how all of these issues show up in only 300 miles.

You don't want to have to get a new key. Over $660 for a complete key.

EDIT: Actually, with a 2014, you might be able to find a locksmith that can program the key fob. Things changed with the 2015 model year and you MUST get a dealer to program a new fob. I did find a locksmith online that sells NEW OEM fobs for $99 (versus $424 from the dealer) with exact FCC ID and other numbers as you would get from the dealer, if you ever need one. It comes with a key blank that can be laser cut by any competent locksmith. The site is www.northcoastkeyless.com. I bought one and couldn't use it, so I was able to return it for a full refund.

https://northcoastkeyless.com/produc...zdc11-iyzdc12/

 

By any chance, has anyone dismounted the overhead control unit (the one the rear view mirror connects to)? Perhaps some wires got clipped when it was put back?

 

You have a complete live report of what faults are involved.
You realized that new faults go straight into "Stored" status and the LPFP is actively disfunctioning.


--1-- TOP PRIORITY:
I would tackle the in-tank 3-phase fuel pump module first.
This module sources its GND in the passenger side of trunk near the R-SAM.

This is a VIP-Module networked directly with engine CAN-C and provides fuel volume to HPFP. It has to work right.

Before you take everything apart reproduce the problem so you know the difference after fixing.

See what the pressure sensing does.... I think it is erroneously flagged due to poor GND circuit.
I don't know where pressure sensor gets its GND, separately?


--2-- Goofy module status:
-- New Stored faults are called transients... caused by marginal painted GND posts.

-- Organize a GND cleaning campaign as a repsir item before anything else to save time.

-- Disconnect batteries when disturbing GND circuits.

-- In that order:

1. -- Trunk L+R
2. -- Front footwell L+R
3. -- Engine bay /chassis
4. -- Chair cross-beam

All equally amazing.

 

Chuang,

I forgot something.
01. Make it a habit to keep track of the modules making the report/DTC. This is important.
When one module is down, the one reporting it will be its buddy modules.

02. When all modules are running, keep track of their QUANTITY. This seems simple but is important.
So at a glance by modules count, you can tell by QTY which module is missing/offline.
Yes, take photos of all the modules name for your own database.

Take a read here to see how whacky the content of the DTC can be from simple power loss and various scanners DTC response towards the same test/power-loss
https://mbworld.org/forums/e-class-w...276-820-a.html

 

I start reading this thing and it's like I'm seeing it for the first time. Then I find I made a bunch of posts to it last January. Does this happen to anyone else? ​​​​​​​ Am I existing in a parallel universe?

 

​​​​​​​

 

friends refer to that as "senior moment"
​​​​​​​

 

My moments have transitioned into a continuum (lol).