Fault codes
Thread Starter
Senior Member
Joined: Aug 2015
Posts: 400
Likes: 23
2005 E55 AMG
Fault codes
I borrowed a friend's Foxwell and cleared a bunch of stored codes but these came back.
P20A2
idle speed control implausible. Check system for unmetered air.
7211
DTR: the CAN communication of the engine control module if faulty.
And I'm including a picture of my fuel trims.
Does it seem normal for a tuned car?
P20A2
idle speed control implausible. Check system for unmetered air.
7211
DTR: the CAN communication of the engine control module if faulty.
And I'm including a picture of my fuel trims.
Does it seem normal for a tuned car?
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
ECU IS UPSET
I borrowed a friend's Foxwell and cleared a bunch of stored codes but these came back.
P20A2
idle speed control implausible. Check system for unmetered air.
7211
DTR: the CAN communication of the engine control module if faulty.
And I'm including a picture of my fuel trims.
Does it seem normal for a tuned car?
P20A2
idle speed control implausible. Check system for unmetered air.
7211
DTR: the CAN communication of the engine control module if faulty.
And I'm including a picture of my fuel trims.
Does it seem normal for a tuned car?
Don't worry about the lean trims causing spongy response until after the live faults have been fixed.
No1 - Something is tanking your ECU CAN-Bus. See other shared bus partners, not only ECU itself. Get a full chassis scan with all modules.
No2 - You have bad air metering, that means ECU has poor fuel injection control. A lot of times MAF air inlet is not sitting right...
All this cause poor trims control.
Overall good shape with only a couple reported issues.
Last edited by CaliBenzDriver; Feb 24, 2026 at 08:38 PM.
MBWorld Fanatic!
Joined: Jul 2014
Posts: 3,344
Likes: 594
2005 e55 AMG
A tune on the car does not normally effect anything like your having.
Find out where your air leak is for the 202a code.
We do not have Mass Air Flow sensors on the M113K engine,just a MAP sensor.
Make sure your voltage is correct to the PCM/Battery.
Find out where your air leak is for the 202a code.
We do not have Mass Air Flow sensors on the M113K engine,just a MAP sensor.
Make sure your voltage is correct to the PCM/Battery.
Last edited by SICAMG; Feb 26, 2026 at 01:54 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
flammable vs. explosive
Propane needs a hose to inject into... you can't swamp the whole area with propane: it's explosive!
Spray carb cleaner to test individual component, not showering the whole engine.
Spray the base of injector near seals
Last edited by CaliBenzDriver; Feb 27, 2026 at 06:23 PM.
Thread Starter
Senior Member
Joined: Aug 2015
Posts: 400
Likes: 23
2005 E55 AMG
I can confirm flammables around a hot engine do catch on fire (been there!) - Keep an extinguisher handy and shop rags.
Propane needs a hose to inject into... you can't swamp the whole area with propane: it's explosive!
Spray carb cleaner to test individual component, not showering the whole engine.
Spray the base of injector near seals
Propane needs a hose to inject into... you can't swamp the whole area with propane: it's explosive!
Spray carb cleaner to test individual component, not showering the whole engine.
Spray the base of injector near seals
I see a couple of videos where they used a hand pump and a cigar to pump smoke in. Where should I connect the hose to on the engine if I go that route?
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
smoke test inlet
- inject smoke in the PCV line
- or in the brake booster line
- seal the throttle plate with a rag or shipping tape.
- check EVAP solenoid leak through ?
Explosive propane gas calls for caution. Carb cleaner a lot safer
Last edited by CaliBenzDriver; Feb 27, 2026 at 07:17 PM.
Trending Topics
Thread Starter
Senior Member
Joined: Aug 2015
Posts: 400
Likes: 23
2005 E55 AMG
But don't understand "check EVAP solenoid leak through ?"
Sorry, I'm no mechanic, I do learn from videos and can follow step by step instructions and getting more and more comfortable with wrenching if I have direction.
Thanks
MB World Stories
The Best of Mercedes & AMG
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look
Verdad Gallardo
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish
7 Craziest Things AMG Gas Ever Built
Verdad Gallardo
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
EVAP CONTROL SOLENOID
Okay, I think I can follow those instructions.
But don't understand "check EVAP solenoid leak through ?"
Sorry, I'm no mechanic, I do learn from videos and can follow step by step instructions and getting more and more comfortable with wrenching if I have direction.
Thanks
But don't understand "check EVAP solenoid leak through ?"
Sorry, I'm no mechanic, I do learn from videos and can follow step by step instructions and getting more and more comfortable with wrenching if I have direction.
Thanks
It's connected to the intake through a busy pulsed solenoid that begins to leak internally when it fails.
Check if your EVAP Solenoid is still sealed (good) or already leaking (bad).
Replace only if testest as being bad.
Last edited by CaliBenzDriver; Feb 27, 2026 at 09:22 PM.
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,973
Likes: 1,320
From: Republic of Texas
'99 and '05 E55 AMG
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
@bbirdwell is sharing that the rubber elbows in/out of the EVAP Solenoid can fall apart to leak intake air vacuum. 
advanced rubber formulation
So not only the failed solenoid, add the elbow fitting as leak source. Inspect /replace.
advanced rubber formulation
So not only the failed solenoid, add the elbow fitting as leak source. Inspect /replace.
Thread Starter
Senior Member
Joined: Aug 2015
Posts: 400
Likes: 23
2005 E55 AMG
Thread Starter
Senior Member
Joined: Aug 2015
Posts: 400
Likes: 23
2005 E55 AMG
@bbirdwell is sharing that the rubber elbows in/out of the EVAP Solenoid can fall apart to leak intake air vacuum.
advanced rubber formulation
So not only the failed solenoid, add the elbow fitting as leak source. Inspect /replace.
advanced rubber formulation
So not only the failed solenoid, add the elbow fitting as leak source. Inspect /replace.
Out Of Control!!
Joined: Apr 2019
Posts: 12,161
Likes: 6,882
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
