Ptrigg17

I have been the happy owner of my 07 550 cabriolet since January. When driving the other day the dressed CEL came on. I pulled the code when I returned home with the car driving without any issues and the P2004 code with the description of stuck variable intake control bank 1. I immediately went to this forum and other internet sources and read about the reason for the code. When I went to the car to see the expected broken lever I was surprised to find everything in working order. The lever from the activator and both arms are connected and work in synchrony. Can anyone shed some light on other possible reasons for the code? Also ,is there any reason to not continue to drive the car since it seems to run fine?

Plutoe

I think your idea is sound-----clear the fault and continue to drive the car!!However if the fault returns it's not linkage it's electronic!!

Ptrigg17

Thanks for the input, that was my plan. By electronic are you referring to an associated sensor?

Ptrigg17

I decided to check the code again and found a code p0025 in addition to the p2004 . My question is what conditions would cause both the codes appearing at the same time with no drivability issues? I am confident that within the vast knowledge of the members of this forum someone can help me out with a plausible answer for these codes.

Rudeney

Those are two separate issues, but both somewhat common problems with this engine. P2004 is a bad tumble in the intake manifold. The proper fix is to replace the entire manifold. Sometimes, there are other ways to fix this this, by replacing a broken external actuator arm with an aftermarket metal piece, but if it's internal, you don't want broken parts sucked into the engine.

P0024 is a bad camshaft adjuster solenoid (a.k.a. "cam magnet"). There was a TSB for this on your engine. Need to replace all four camshaft adjuster solenoids. Parts are about $100 and it's not a difficult DIY if you are so inclined. Otherwise, I'd expect to pay less than $400 at good indy shop.

Ptrigg17

Thanks Rodney for your response. My confusion over these codes is that the linkage for the variable intake is not broken. I inspected it thoroughly and it is intact. Somewhere in my searching on the internet I came across a posting that said the 2 codes were related and that the problem was the cam sensors and it triggered the p2004 code. It seems unlikely that both problems happened at the same instant, so I am inclined to focus on the cam sensors. If anyone else has come across both codes at the same time ,I would appreciate some input.

insame1

One thing people forget to check is the battery. these cars are very susceptible to low voltage problems and false code. .

Ptrigg17

I Read something about that and put a charger on it yesterday. The charger indicated a low battery. Since the car has been sitting for the winter it may be the battery.

Bill51sdr

If you are able to easily move the linkage with your finger or tool of some kind than you have a broken actuator. As Rodney stated there are aftermarket repairs for this that cost far less than replacing the entire intake manifold. I have done this repair and it is not terribly difficult for an experienced DIY'er. There are threads about this repair, I have personally done it on the CLK 350 in my signature.

Rudeney

Sometime the linkage is broken inside the manifold and you can't see the damage.

Ptrigg17

So as I posted ,I put my trickle charger on the car for 24 hours after reading that a bad battery can cause unrelated codes. I took the car for a ride yesterday and after the third start/stop cycles the CEL went out! Thanks to everyone for the helpful input. If more codes come back I will replace the battery.

ThumpaS550

Hey I know I’m late to the party but I have the same issue with my S550! First I got a p0025, went ahead and replaced the cam magnet, and sure enough I then get a p2004. Same as you, no broken actuator. So this could all be from a bad battery?? And which battery was it in your case? Because my engine bay battery is up to voltage but I know for a fact my trunk battery needs replacing. I would very much appreciate a response as this has been a giant headache, I fix one problem and boom! Another one appears. Thanks.

insame1

clk only has one battery.

ThumpaS550

Got it, didn’t even think about that. Thanks. Do you have any idea if in my case the battery could be the culprit? Same exact codes as ptrigg. No drivability issues. And on top of that sometimes while I drive a red battery icon will appear on the dash. I know my trunk battery is larger and is the battery that controls the electronics of the vehicle, while the engine battery is strictly for starting. So with that said if that battery was low, which I know it is, that’d most likely be the one to trip false CEL codes. You said this is a common thing?

insame1

first the battery in the trunk is for starting the car. the battery under the hood is for accessories. Yes low voltage can cause false issue all over the place. Yours being an 07 s class has sbc braking (brake by wire) there was a class action against MB on at very least the w211 e class (i own one) that extended the warranty. I would have it checked out as there is something like 300k pushes before the computer just says it is bad.

Suzilovesmbz

Rudeney is right about intake manifold. Replace the whole thing. I had the metal lever put in and it broke in 2 places because they dont put a nut to keep it in and as it moves back n forth it comes unscrewed. So this time im replacing intake manifold

The metal lever on intake manifold doesnt work