S212 2010 E350 CDI BlueTEC oil leak - please help!

[GuybrushThreepwood]

I have a 2010 S212 E350 CDI BlueTEC. My engine management light recently lit amber. Around the same time, the transmission started getting a bit clunky/jerky.

I bought an OBDII reader to use with my phone. It reported the following:
Car Scanner ELM OBD2
DTC report
Selected brand: Mercedes-Benz

============1==============
P2454
Raw code: 2454
ECU: Engine control unit
Status: Confirmed
OBDII: Diesel particulate filter (DPF) pressure sensor A - circuit low

============2==============
P2453
Raw code: 2453
ECU: Engine control unit
Status: Pending
OBDII: Diesel particulate filter (DPF) pressure sensor A - circuit malfunction

============3==============
P11DA(00)
Raw code: 11DA00
ECU: Engine control unit
Status: Test failed, Test failed (current drive cycle), Pending, Confirmed, Test failed since last DTC clear, Warning indicator requested

============4==============
P1297(00)
Raw code: 129700
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear, Test not completed during this operation cycle
OBDII: Injector High Sides Shorted Together

============5==============
P14D8(00)
Raw code: 14D800
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear

============6==============
P118A(00)
Raw code: 118A00
ECU: Engine control unit
Status: Pending, Test failed since last DTC clear, Test not completed during this operation cycle

============7==============
P11A7(00)
Raw code: 11A700
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear

============8==============
P11D9(00)
Raw code: 11D900
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear

============9==============
P11DA(00)
Raw code: 11DA00
ECU: Engine control unit
Status: Test failed, Test failed (current drive cycle), Pending, Confirmed, Test failed since last DTC clear, Warning indicator requested

============10==============
P131E(00)
Raw code: 131E00
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear

============11==============
P118D(00)
Raw code: 118D00
ECU: Engine control unit
Status: Pending, Test failed since last DTC clear, Test not completed during this operation cycle

============12==============
P10BB(00)
Raw code: 10BB00
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear

============13==============
P1218(00)
Raw code: 121800
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear
OBDII: CID High

============14==============
P1219(00)
Raw code: 121900
ECU: Engine control unit[Archive (inactive)]
Status: Test failed since last DTC clear
OBDII: CID Low

A bit of Googling led me to believe that I needed to replace the manifold pressure sensor so I ordered this: https://www.amazon.co.uk/gp/product/B01LF7Q64A/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Today I lifted the bonnet to attempt to fit it. On removing the plastic engine cover, I discovered that there appears to be an oil leak per the photos below. Is anyone able to advise me what the source of the leak is?

 

[onefortheroad]

I'd hazard a guess that your pcv valve pipe has either dislodged from the batwing or the pipe has split. Orange end in pictures.

Pcv = positive crankcase ventilation .

 

[GuybrushThreepwood]

I'd hazard a guess that your pcv valve pipe has either dislodged from the batwing or the pipe has split. Orange end in pictures.

Pcv = positive crankcase ventilation .

Interesting - thanks @onefortheroad - is this something that I should be easily able to confirm as someone who can use basic tools but is certainly not a proper mechanic? Is there much involved in removing the bits above the PCV valve pipe?

 

[onefortheroad]

2 torx screws in the air filter , unclip the filter and remove it. Be careful not to drop the screws . The bat wing should flex enough on that hinged part for you to be able to see if the pcv is connected or not, it just pushes into a hole , it's not fastened in tbh.

I'd remove both filters and the batwing , look to the red seal on the turbo,there's 1 big jubilee clip to loosen off . Unplug the mafs , Remove the lot and have a good look about and a clean up with some Gunk spray . The red turbo seal I'd replace also whilst it's in bits.

 

[GuybrushThreepwood]

Great - thanks. I've only just realised that the big section across the middle is the thing that you are calling the batwing. I assumed that was the name for a style of connector on the end of the pipe or something. I'll have a look at it tomorrow. If I find that I can't get access without removing the batwing then is doing that a challenging task?

 

[onefortheroad]

Great - thanks. I've only just realised that the big section across the middle is the thing that you are calling the batwing. I assumed that was the name for a style of connector on the end of the pipe or something. I'll have a look at it tomorrow. If I find that I can't get access without removing the batwing then is doing that a challenging task?

Try unclipping that side air filter and pull off the batwing pipe on that end , it may flex up enough to see if the pcv pipe is hanging out . Be careful putting the batwing back onto the air filter,there's a red seal on the end that can be jammed and twisted .

 

[GuybrushThreepwood]

This video makes it look easy enough to remove, even for someone of my level of incompetence. Wish me luck...

 

[onefortheroad]

Good luck. Hopefully it's your little red seal at fault. Lettuce know how you get on.

 

[GuybrushThreepwood]

I started lifting bits off the top of my engine today. I believe I've a pretty severe case of black death. The first photo shows the amount of hardened material that I removed using a flat blade screwdriver as a scraper/chisel. The total volume of material is the equivalent of probably 3 tennis balls.

I spent about 90 minutes scraping/chiseling to remove the material and get down to the plugs/pipes/cables etc. hidden beneath.

I believe the source of the material is the middle of the 3 right-hand side cylinders but it's possible that the front cylinder has a similar issue.

I'd welcome advice on what to do at this point. Am I looking at a big bill to get this repaired?