P2279 need advice
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Newbie
Joined: Aug 2024
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2013 C300
P2279 need advice
New to European models. I consider myself a better than average hobbyist when it comes to cars. I bought a 2013 C300 4matic to try my hand at something new. I’ve resealed the front cam covers, replaced the cam position sensors and added the sacrificial harnesses as oil was wicking to the ecu. I also decarboned the valves as I had the intake off replacing the spark plugs and I lastly replaced the pcv centrifuge cover as I had tons of oil in the intake. Since then I’m getting a p2279 code and what seems like excessive vacuum when I remove the oil fill cap. Runs fine. Car was at dealer for subframe replacement and they believe the p2279 is a leak at the intake. I’m skeptical on that. I’d like any opinion as to a probable cause and course of action on a repair. Thanks in advance!
Out Of Control!!
Joined: Apr 2019
Posts: 12,191
Likes: 6,889
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
New to European models. I consider myself a better than average hobbyist when it comes to cars. I bought a 2013 C300 4matic to try my hand at something new. I’ve resealed the front cam covers, replaced the cam position sensors and added the sacrificial harnesses as oil was wicking to the ecu. I also decarboned the valves as I had the intake off replacing the spark plugs and I lastly replaced the pcv centrifuge cover as I had tons of oil in the intake. Since then I’m getting a p2279 code and what seems like excessive vacuum when I remove the oil fill cap.
Runs fine. Car was at dealer for subframe replacement and they believe the p2279 is a leak at the intake.
I’m skeptical on that.
I’d like any opinion as to a probable cause and course of action on a repair.
Thanks in advance!
Runs fine. Car was at dealer for subframe replacement and they believe the p2279 is a leak at the intake.
I’m skeptical on that.
I’d like any opinion as to a probable cause and course of action on a repair.
Thanks in advance!
what's code p2279?(Keep your 4Cyl. Turbo oil clean on early 5kMi schedule).
You mentioned intake oil swamp from high blow-by overheated oil... is intake sensor dirty or cooked up like the leaky CPS ??
Read intake (MAP/MAF) sensors with engine stopped for reference.
Thread Starter
Newbie
Joined: Aug 2024
Posts: 6
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2013 C300
You replaced PCV now have high vacuum and local MB dealer says intake leak.
what's code p2279?(Keep your 4Cyl. Turbo oil clean on early 5kMi schedule).
You mentioned intake oil swamp from high blow-by overheated oil... is intake sensor dirty or cooked up like the leaky CPS ??
Read intake (MAP/MAF) sensors with engine stopped for reference.
what's code p2279?(Keep your 4Cyl. Turbo oil clean on early 5kMi schedule).
You mentioned intake oil swamp from high blow-by overheated oil... is intake sensor dirty or cooked up like the leaky CPS ??
Read intake (MAP/MAF) sensors with engine stopped for reference.
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
As a better than average hobbyist, you definitely need to have the proper diagnostic tools. The Star Diagnostic System (SDS) is comprised of XENTRY software, a Windows laptop or tablet, and a C4 multiplexer with DoIP capabilities. (DoIP=Diagnostics over IP, allowing for remote diagnostics.) SDS is the Mercedes system dealers and shops use. I and others will highly recommend contacting @BenzNinja on this site or at www.benzninja.com about the software and hardware sources. The C4 multiplexer is usually a clone out of China. A genuine Mercedes C4 will cost thousands of dollars versus several hundred for a clone.
XENTRY has step-by-step troubleshooting procedures for diagnosing and repairing fault codes, such as P2279. Additionally, BenzNinja can remotely access your car and help diagnose problems if you get a membership in his club.
Secondly, get a Mercedes specific scanner, such as the LAUNCH Creader Elite 2.0 BENZ for about $160 on Amazon. It's compact and can be kept in your glove box or other storage space. Generic OBD scanners are worthless when it comes to Mercedes. I keep a LAUNCH Creader scanner in the rear SAM (fuse cluster) location in the trunk. You should never leave home without it.
XENTRY has step-by-step troubleshooting procedures for diagnosing and repairing fault codes, such as P2279. Additionally, BenzNinja can remotely access your car and help diagnose problems if you get a membership in his club.
Secondly, get a Mercedes specific scanner, such as the LAUNCH Creader Elite 2.0 BENZ for about $160 on Amazon. It's compact and can be kept in your glove box or other storage space. Generic OBD scanners are worthless when it comes to Mercedes. I keep a LAUNCH Creader scanner in the rear SAM (fuse cluster) location in the trunk. You should never leave home without it.
Last edited by JettaRed; Aug 15, 2024 at 07:00 PM.
Thread Starter
Newbie
Joined: Aug 2024
Posts: 6
Likes: 0
2013 C300
As a better than average hobbyist, you definitely need to have the proper diagnostic tools. The Star Diagnostic System (SDS) is comprised of XENTRY software, a Windows laptop or tablet, and a C4 multiplexer with DoIP capabilities. (DoIP=Diagnostics over IP, allowing for remote diagnostics.) SDS is the Mercedes system dealers and shops use. I and others will highly recommend contacting BenzNinja on this site or at www.benzninja.com about the software and hardware sources. The C4 multiplexer is usually a clone out of China. A genuine Mercedes C4 will cost thousands of dollars versus several hundred for a clone.
XENTRY has step-by-step troubleshooting procedures for diagnosing and repairing fault codes, such as P2279. Additionally, BenzNinja can remotely access your car and help diagnose problems if you get a membership in his club.
Secondly, get a Mercedes specific scanner, such as the LAUNCH Creader Elite 2.0 BENZ for about $160 on Amazon. It's compact and can be kept in your glove box or other storage space. Generic OBD scanners are worthless when it comes to Mercedes. I keep a LAUNCH Creader scanner in the rear SAM (fuse cluster) location in the trunk. You should never leave home without it.
XENTRY has step-by-step troubleshooting procedures for diagnosing and repairing fault codes, such as P2279. Additionally, BenzNinja can remotely access your car and help diagnose problems if you get a membership in his club.
Secondly, get a Mercedes specific scanner, such as the LAUNCH Creader Elite 2.0 BENZ for about $160 on Amazon. It's compact and can be kept in your glove box or other storage space. Generic OBD scanners are worthless when it comes to Mercedes. I keep a LAUNCH Creader scanner in the rear SAM (fuse cluster) location in the trunk. You should never leave home without it.
Out Of Control!!
Joined: Apr 2019
Posts: 12,191
Likes: 6,889
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
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Out Of Control!!
Joined: Apr 2019
Posts: 12,191
Likes: 6,889
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
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Thread Starter
Newbie
Joined: Aug 2024
Posts: 6
Likes: 0
2013 C300
Out Of Control!!
Joined: Apr 2019
Posts: 12,191
Likes: 6,889
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
CANCELLING CHAOS...
Your free fix is actually a warning itself!
Your engine is ingesting extremely hot oil that cooked PCV O-ring all the way at intake.
How is that?
The limited engine oil effectiveness (viscosity + solenoid) is burning oil on overheated pistons. Your 4Cyl. engine has a known appetite for pistons.
Some of the burnt oil gets stuck in piston rings, some gets vaporized into dirty intake.
The super heated pistons cause extreme heatsoaks that cook all plastics attached to engine heads. Specifically the cam sensors that send oil into ECU on its last day.
There's more goodness related to extreme heat... I personally think it's overrated to save gasoline with limited oiling when it cause so much ridiculous chaos and poor performance.
Have a look at this thread where some of us have cancelled extreme heat for free with better oiling. I believe this can extend your engine life many folds but may also kill it during normal cleaning. Loose junk goes through filter bypass valve to plug-up squirter lines: piston fragmentation.
Your engine has the faults giving you clues... now is time to act!!!
At the very minimum do chance oil at 3 to 5kMi.... not 8, 10 or 12kMi.
Use a clean API-SP rated oil...
Mobil1 now even has a OW-40 SP available.
Better oil viscosity yields better cooling that your engine is desperately asking for.
Your engine is ingesting extremely hot oil that cooked PCV O-ring all the way at intake.
How is that?
The limited engine oil effectiveness (viscosity + solenoid) is burning oil on overheated pistons. Your 4Cyl. engine has a known appetite for pistons.
Some of the burnt oil gets stuck in piston rings, some gets vaporized into dirty intake.
The super heated pistons cause extreme heatsoaks that cook all plastics attached to engine heads. Specifically the cam sensors that send oil into ECU on its last day.
There's more goodness related to extreme heat... I personally think it's overrated to save gasoline with limited oiling when it cause so much ridiculous chaos and poor performance.
Have a look at this thread where some of us have cancelled extreme heat for free with better oiling. I believe this can extend your engine life many folds but may also kill it during normal cleaning. Loose junk goes through filter bypass valve to plug-up squirter lines: piston fragmentation.
Your engine has the faults giving you clues... now is time to act!!!
At the very minimum do chance oil at 3 to 5kMi.... not 8, 10 or 12kMi.
Use a clean API-SP rated oil...
Mobil1 now even has a OW-40 SP available.
Better oil viscosity yields better cooling that your engine is desperately asking for.
Last edited by CaliBenzDriver; Aug 15, 2024 at 08:06 PM.
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
