p2279 & p2463 and a Hissing

[Marcoss101]

Hi,

My engine light came on tonight and thanks for taking time i am a newbie to both this club and MB.

I have had my 2013 W212 E250 sport for about 6 months and it has now 96k on the clock with full MB service history. I noticed a slight blow from the exhaust around 2 months ago, its so slight but im sure i can hear it blowing. It was due so i took it in for a service to my mechanic who fitted the parts i supplied which were, Air, Fuel, Oil filters and 6L of mobil 1. Usually he will drop me home but i wanted to stay and have him look for the exhaust leak. He did take some time but his conclusion was there was no leak. Ive trusted him with many cars in the past but i noticed that he had put the full 6L in, probably not important but it is a fact. That got me thinking a little so i checked the dipstick when i got home it was just over the top marker, later he ensured me that was fine. Not long after around a week and unfortunalty the car is doing short runs currently so maybe 100 miles the engine light came on and the car had reduces revs etc, i took it to him and he found 1 code p2463. He explained that is was soot build up in the DPF and he could call a mobile mechanic to come out and perform a regenation so i said ok and came back later, so he plugged the car in but despite trying twice the car would not perform a regenration due to heavy soot build up, i think he said the figure needs to be lower than 200 but the reading for mine was 307 if that makes any sense. At this time this was the only code.

Maybe it was the light coming on just after the service but something didn`t feel right, i checked the oil level the next day and it was sitting in the middle of the two markers and i noticed a hissing noise coming from around the power steering pump area, i asked him to read the codes again and it now has p2463 (pending) & p2279 showing.

Any ideas what the hissing might be and could there be some false readings being reported?

Any advice would be great here please?

Thank,
Mark.

 

[John Laidlaw]

Welcome
I’ve not got the code listing in front of me right now I’ll have a look later unless someone jumps in meantime .
There’s a possibility you have an injector seal issue by your description but not sure if your codes tie up
Is your guy a Mercedes specialist?
They are quite ... unique!

 

[Marcoss101]

Thanks John,
Yes the mobile chap was a MB specialist, whilst he was trying to carry out a regen he did mention that the injectors were fine but im not sure if that would check the seals on the injectors aswell.
Thanks again.
Mark.

 

[John Laidlaw]

Thanks John,
Yes the mobile chap was a MB specialist, whilst he was trying to carry out a regen he did mention that the injectors were fine but im not sure if that would check the seals on the injectors aswell.
Thanks again.
Mark.

It should have Mark- pressures would display on his diagnostic (Star presumably if he’s a specialist) and seals would also cause a pressure leak as well as the injectors themselves being inop

 

[Marcoss101]

I will try to speak to him again about the injectors, i just had another look for the hissing and took a video:

Are the noises normal?


Download Attachment

Thanks
Mark.

 

[Steve@Avantgarde]

I would say that has a snapped inlet manifold bolt or 2. Quite common on the OM651. You must have a fault code there relating to an air leak.

 

[John Laidlaw]

Sorry I’ve been slow to look at the list P2279 is an air leak indeed at the intake manifold as Steve says above....this is what the hissing is

 

[Steve@Avantgarde]

I would do a smoke test on the charge air system. Check the bottom turbo hoses as well, they also split, but a smoke test would confirm where the leak is.

 

[Marcoss101]

Thank you for the good advice guys, I will try and get that test done tomorrow. Looks like i might have to learn to love this car the painfull way.

Cheers,
Mark.

 

[John Laidlaw]

It will get better Mark, generally they are brilliant just like to keep us on our toes!

 

[Marcoss101]

To be honest i love the car, ive had several 5`s in the past and the last one was badly damaged in a non fault i might add, the hire car was a E-Class but the later facelift model, a 15 or 16 plate with the blue whatsit tank in the boot. I had that rental for some time and fell for it totally i did not want to give that back! I knew then i could have had better that the 5 all this time !

One thing I cannot work out is why we saw the P2463 code before the P2279 one. I`ll do the smoke test and find out where the leak is and go from there.

Mark.

 

[Marcoss101]

Took it in today, didnt need a smoke test he found a leak in the cooler to intake hose. Thanks and Phew.

Ordered gen replacements for next week. i am still thinking the DPF is blown but we will see.

Mark.

 

[Steve@Avantgarde]

Why do you think the DPF is blown?

 

[Marcoss101]

I am not sure really, the P2463 code came first folowed by the 2279 code.

 

[Steve@Avantgarde]

Well, if its assuring, I've never seen a blown DPF caused by an air leak. I've seen them soot up, and if you aren't a hard driver, theres a chance the fill time increased because the mixture was incorrect and it couldn't meet the preconditions to regenerate, hence seeing that code first.

 

[Marcoss101]

Thanks Steve,
i am expecting the parts tomorrow so with a bit of luck i might be able to get them fitted. She`s part of the family know so what needs to be done will have to be done..

 

[Marcoss101]

Hi,
I have had the hose fitted and the codes removed and it drove for around 20 mins on a dual carraigeway but the power was limited, then the light came on. I returned home and removed the code P2463 again then drove to cambridge which is around an hour on the motorways, there was a power restriction but the light stayed off until i went to turn around i turned the engine off for a toilet break and when i started it again the light came on again. wiped the code again and drove home the light stayed off but when i got home and turned off and on it came back. It wont rev above 3k and the temp gauge which is usually stable around 88 kept dropping to 80 then back to 88, most of the time the temp was 80.
Any ideas?

Thanks,
Mark.

 

[Steve@Avantgarde]

The DPF is probably blocked and won't regen, you may need to do a forced regeneration with a star machine and update the software. Its a common issue. Check the part number of the pressure sensor too. There have been many modifications to that.

It maybe you had 2 faults all along?

 

[Marcoss101]

There is still a hissing from under the bonnet also, but no P2279 to go with it. Also i forgot to mention that there is no kickdown from the gearbox.

 

[Steve@Avantgarde]

Where do you live? Perhaps you need to find a proper mercedes specialist to help you.