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Discussion Starter #1
Hi
So my AMG is getting jealous of my bike or something now that I don't drive it every day. I had BAS/ESP lights (swapped the brake pedal switch) and a CEL, and also about the same performance as a bus.

Did a scan with CarSoft and came up with the following:
Module Info :

Part Number : 112 153 46 79
Software Version : 39/02
Hardware Version : 211
Diagnosis Recognition : 6/-97
Supplier : Bosch

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Stored and Current Error :-

Error Code : P2024

P2024 Air pump switch over valve (P0412)




Stored and Current Error :-

Error Code : P20BE

P20BE Right O2 probe before KAT : Heating power supply

--> O2-Sonde Signal limit value faulty.
--> CHECK ENGINE (MIL) Light ON

Measure Values :
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- Lower Limit : < -0,15V
- Upper Limit : : > 1,5V




Stored and Current Error :-

Error Code : P20BF

P20BF Left O2 probe before KAT : Heating power supply

--> O2-Sonde Signal limit value faulty.
--> CHECK ENGINE (MIL) Light ON

Measure Values :
----------------
- Lower Limit : < -0,15V
- Upper Limit : : > 1,5V




Stored and Current Error :-

Error Code : P208C

P208C Hardware fault in the anti-knock control, left cylinder bank (P1324)




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So I don't particularly care about the air injection switchover valve. It's been an issue since I got the car and I don't think it has any real impact.
I also think it's odd that both O2 sensors would have heating circuit failures at the same time. Is there any common wiring, fuse or relay between them?

The P208C has me worried. I've done some googling and the only references to P208C I can find talk about the supercharger clutch on the 55AMGs - doesn't tie in with the description. Car certainly feels as if the supercharger is not working when it's playing up. But sometimes, it's fine...

Has anyone seen this before, or have any info please? :hail:
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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Stored and Current Error :-

Error Code : P208C

P208C Hardware fault in the anti-knock control, left cylinder bank (P1324)

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The P208C has me worried. I've done some googling and the only references to P208C I can find talk about the supercharger clutch on the 55AMGs - doesn't tie in with the description. Car certainly feels as if the supercharger is not working when it's playing up. But sometimes, it's fine...

Has anyone seen this before, or have any info please? :hail:
This doesn't reference the 55 but it does reference the fuel injector 8 (although I don't know if that's relevant to your car https://www.autocodes.com/p0208_mercedes-benz.html

No idea if this is helpful (but I hope it's a start). BTW, we don't know the year of your '32 .
 

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Discussion Starter #3
This doesn't reference the 55 but it does reference the fuel injector 8 (although I don't know if that's relevant to your car https://www.autocodes.com/p0208_mercedes-benz.html

No idea if this is helpful (but I hope it's a start).
Thanks Len
Probably not relevant (It's a V6) - though the fuel consumption would indicate two large fuel injectors just pumping gas out the tank into the air sometimes :)
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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Thanks Len
Probably not relevant (It's a V6) - though the fuel consumption would indicate two large fuel injectors just pumping gas out the tank into the air sometimes :)
So it's a 170 then? Include the year of your car in your profile (to the left) will help others who see this thread :wink:
 

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Discussion Starter #5
This doesn't reference the 55 but it does reference the fuel injector 8 (although I don't know if that's relevant to your car https://www.autocodes.com/p0208_mercedes-benz.html

No idea if this is helpful (but I hope it's a start). BTW, we don't know the year of your '32 .
So it's a 170 then? Include the year of your car in your profile (to the left) will help others who see this thread :wink:
Will do - thanks
It's a 2003 R170 SLK32 AMG (I thought the slk32 was only an R170, the 171/172 were SLK55s?) :)
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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I still think it's a fuel injector issue though. From that link:
This code is similar to codes P0200 - P0207, and P0209 - P0212, which all indicate fuel injector circuit issues.
Although it is strange that it's showing an "8" and not a "6". In an aside, I didn't know MB made 9, 10, 11 and 12 cyl cars :surprise: but then again, I don't know a lot of things (as my wife keeps reminding me :wink: )
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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It's not a P0208 code - it's P208C
That's what happens when you input something into google and accept the first line :surprise:

P208C Meaning :

P Powertrain Code Problem is related engine, transmission and emissions systems.
2 MFG - Manufacturer Specific
0 Accelerator Pedal Position (APP) Sensor 1 Performance
8 BBV Sensor Circuit Low Voltage
C Transmission

MFG - Manufacturer Specific codes, which have a '1' as their second digit to indicate they are unique to a particular vehicle make or model. These special codes were deemed necessary by the vehicle manufacturers so they could provide additional diagnostic information beyond the basic list of generic OBD II codes for all kinds of faults, not just emissions-related faults.

How To Fix P208C ?
There are currently two main types of cylinder deactivation used today, depending on the type of engine. P208C code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.
http://p208c.enginecodes.net


I hope this helps this time (# 2) :smile:
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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Thanks again, but that description looks seriously wonky ;)
Oh my :surprise:. Sorry it didn't help.

Now we'll hope the more knowledgeable folks will chime in. It's still early in the day :wink:

Good luck :tu:
 

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Discussion Starter #11
My jealousy theory was reinforced today. Drove the car to work. No check engine light, no misbehaving...
Weird.

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Super Moderator CA 2012 SLK55 AMG w/P30
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My jealousy theory was reinforced today. Drove the car to work. No check engine light, no misbehaving...
Weird.

Sent from my HUAWEI GRA-UL00 using Tapatalk
Without sounding like I'm taking the easy way out but I'll ask anyways: how old is the battery?

It seems that virtually all of these "wonky" issues can sometimes be traced to a battery that "is good" but is not "good enough" (general forum concensus, not my fix).

Kinda surprised no one else has entered this discussion.
 

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Discussion Starter #13
Without sounding like I'm taking the easy way out but I'll ask anyways: how old is the battery?



It seems that virtually all of these "wonky" issues can sometimes be traced to a battery that "is good" but is not "good enough" (general forum concensus, not my fix).



Kinda surprised no one else has entered this discussion.


Battery is about a year old. I had the same thought on both your points ;)

I had the bas/esp light on again on the way home with limp mode. Two ignition off/on cycles and it went away.
I fear the electrical gremlin...


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Super Moderator CA 2012 SLK55 AMG w/P30
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Well, like Jeff Probst says to the 2nd place team on Survivor: "I got nothin' for you".
 

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Discussion Starter #16
Is something not grounded all the time?
I had a similar thought, either a bad ground or a short to ground... but i don't even know where to start looking :/

I replaced the battery as it died (oh the irony) but the problems continued.
I took it to my local dealer, who agreed to plug it into Star and give me a quick diagnosis free of charge (!)



Results:
P2600 (stored) - undervoltage - battery
P2520 (stored) - Feedback through the transmission protection is not maintained
P2023-004 (stored) - Relay for air pump (P0410)
P2024-002 (stored and current) - Y32 Air pump switchover valve - P0412
P20BE-002 (stored) Right O2 front sensor short to ground
P20BF-002 (stored) Left O2 front sensor short to ground
P2008-008 (stored) Heating of front O2 capacity too low
P2088-008 (stored) Heating of front O2 capacity too low
P207c (stored and current) Supercharger mechanical fault (omg)
B1040 (stored) Fault in CAN comms with MR engine control
B1041 (stored) Fault in CAN comms with traction control
B1417 (stored) left dual valve
B1231 (stored) coolant temp sensor
B1418 (stored) right dual valve

OK so what are dual valves?
What's feedback through the transmission protection?
Could the short that appears to happen be related to that P207c? (please please please)
 

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Registered 2003 SLK32 AMG
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Ground issue?

Is there corrosion anywhere? Has it been an area close to salt water, treated roads, flood history or major crash?

I would first get an good code reader, that you can delete codes with also. I would clear all the codes after I recorded them, then start the car and read the codes again.
Then get or make some jumper cables to make temporary grounds to ground all the units a few at a time. A short drive each time with the jumpers in place could help. #8 to # 12 wire would be best. Read the codes between prior to the drive.

I would start with the Battery ground and work my way through out all of the grounds. ECU, and all engine controls. Engine to frame, front to back.

Best wishes

gs
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
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The diagrams show the two upstream 02 sensors sharing a common ground connection via sleeve Z6/27 (which is a solder joint in the harness; unfortunately there is no picture showing the location). Z6/27 eventually connects via green wire to N3/10 Connector 3 Pin 6. (N3/10 is the ECU)
 

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Discussion Starter #19
Is there corrosion anywhere? Has it been an area close to salt water, treated roads, flood history or major crash?

I would first get an good code reader, that you can delete codes with also. I would clear all the codes after I recorded them, then start the car and read the codes again.
Then get or make some jumper cables to make temporary grounds to ground all the units a few at a time. A short drive each time with the jumpers in place could help. #8 to # 12 wire would be best. Read the codes between prior to the drive.

I would start with the Battery ground and work my way through out all of the grounds. ECU, and all engine controls. Engine to frame, front to back.

Best wishes

gs
Thanks for the feedback. Nowhere near the coast, we don't get snow/ice here, or much flooding either ;) Nothing that would cause any issues other than just wear and tear and/or age.
I have CarSoft, so that's taken care of. The jumpers to grounds is a great idea - thank you. I will see what I can do.

The diagrams show the two upstream 02 sensors sharing a common ground connection via sleeve Z6/27 (which is a solder joint in the harness; unfortunately there is no picture showing the location). Z6/27 eventually connects via green wire to N3/10 Connector 3 Pin 6. (N3/10 is the ECU)
So it grounds via the ECU? Thanks!
Do you have any idea where I can find these wiring diagrams? Something that will tell me which pins in the O2 sensor plugs are for what, for example - so I can test the harness for grounding/shorting etc?
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
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SSM (Star Service Manual) contains the wiring diagrams, I don't think you can buy it any longer unfortunately.
 
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