My Merc has been showing the CEL and I have done a quick Error readout.
P0025(00)
Raw code: 002500
ECU: Engine control unit
Status: Test failed (current drive cycle), Pending, Confirmed, Test not completed since last DTC clear, Test failed since last DTC clear, Test not completed during this operation cycle
OBDII: Camshaft position (CMP), exhaust/right/rear, bank 2 - timing over-retarded

============13==============
P2540(00)
Raw code: 254000
ECU: 7EB[Archive (inactive)]
Status: Test failed, Test failed (current drive cycle), Pending, Test failed since last DTC clear
OBDII: Fuel low pressure sensor - range/performance problem

============14==============
P0087(00)
Raw code: 008700
ECU: 7EB[Archive (inactive)]
Status: Test failed, Test failed (current drive cycle), Pending, Confirmed, Test failed since last DTC clear
OBDII: Fuel rail/system pressure too low

============15==============
P008A(00)
Raw code: 008A00
ECU: 7EB[Archive (inactive)]
Status: Test failed, Test failed (current drive cycle), Pending, Test failed since last DTC clear
OBDII: Low pressure fuel system - pressure too low

============16==============
P002C(B0)
Raw code: 002CB0
ECU: 7ED
Status: Pending
OBDII: Exhaust camshaft profile control B, bank 1 - circuit high

============18==============
P068B(00)
Raw code: 068B00
ECU: 7ED[Archive (inactive)]
Status: Confirmed, Test failed since last DTC clear, Test not completed during this operation cycle
OBDII: Engine control (EC) relay - shut-off delay

============19==============
P0073(00)
Raw code: 007300
ECU: Engine control unit
Status: Test failed, Test failed (current drive cycle), Pending, Confirmed, Test failed since last DTC clear, Warning indicator requested
OBDII: Outside air temperature sensor - high input

My thoughts so far:
- I had a paint shop paint my front bumper and I guess the temperature sensor was not reconnected properly. But would not think that would cause CEL.
- Fuel system pressure does not sound great, but car runs fine otherwise so might not be the cause.
- Camshaft position does not sound great and I could find a lot of cases for the magnets to go bad with the W204, but not the W205. Is there a similar magnet to be changed with the W205 engines?

What do you guys think?

 

Mercedes engines across the range use cam position sensors to measure cam position. One sensor per camshaft so four cam sensors for a V8. Similarly MB uses a magnet or solenoid to control cam position. One magnet per camshaft therefore 4 magnets for a V8.

The sensors are commodity parts bin items that are used across vehicles, engines and model years. I think, but not 100% sure, the same is true for the magnets/solenoids.

Replacing cam position sensors is common due to sensor failure or oil penetration through the sensors and into the harness, working its way to the ECU.

Same comment with magnets. They can fail and also can leak oil into the harness.

Separately, some MB engines suffer from chain tensioner problems and chain stretch. Some engines are afflicted with this more than others.

All of the above can cause CEL, related to cam positioning. Misfire may or may not occur.

Suggest you do some thorough digging into the cam sensor and magnet harness connectors to look for signs of oil.

I think the fuel related code is a separate failure or issue.

 

Its possible that some of those codes were old, and not recent, since they do not cause a CEL.. are you saying the CEL came on after the body shop work ?
Its possible they had let the batter run down or low , which would/could cause the car to re-check some items, which then would cause the CEL on the codes too...
Although the camshaft one is the interesting one.

 

I had a quick glance over a few connections - however, the engine bay is really cramped, so could not check all of them. Did not find any obvious oil on connections.

I had the car for an oil change and inspection, paint was done right after. Car did not show the CEL initially, but during a 350km drive (leading me to believe the temperature sensor is unrelated to CEL).
Cleared the codes for now and will wait a few kilometers if they reappear and then dig a little deeper into the engine bay.

 

Cool , keep us posted..

 

So this thing does not seem to be straight forward.
Initially the CEL reappeared immeadiately (200m drive). I read out the errors again and they were (except for the temp sensor) completely different from two days ago, now ignition coil A for example.

I cleared again, then CEL disappeared for about 15km only to reappear and now the readout gives again a different set of errors (for example ignition coil E). This time I have attached the whole thing. Maybe you guys can make something of it?

Car Scanner ELM OBD2
DTC report
Selected brand: Mercedes-Benz
VIN: WDD205

============1==============
C065A(00)
Raw code: 465A00
ECU: 7EA
Status: Pending, Confirmed, Test failed since last DTC clear, Test not completed during this operation cycle

============2==============
U0CA1(14)
Raw code: CCA114
ECU: Engine control unit
Status: Test failed (current drive cycle)

============3==============
B0220(04)
Raw code: 822004
ECU: Engine control unit
Status: Test failed

============4==============
P0355(13)
Raw code: 035513
ECU: Engine control unit
Status: Test failed (current drive cycle), Pending, Confirmed, Test not completed since last DTC clear, Test failed since last DTC clear, Test not completed during this operation cycle
OBDII: Ignition coil E, primary/secondary - circuit malfunction

============5==============
P2E11(50)
Raw code: 2E1150
ECU: 7ED
Status: Test failed (current drive cycle)

============6==============
P2613(50)
Raw code: 261350
ECU: 7ED
Status: Test failed (current drive cycle)
OBDII: AC refrigerant distribution valve - circuit high

============7==============
P0500(67)
Raw code: 050067
ECU: 7ED
Status: Test failed, Pending, Confirmed, Test failed since last DTC clear, Test not completed during this operation cycle, Warning indicator requested
OBDII: Vehicle speed sensor (VSS) - circuit malfunction
Mercedes-Benz: Vehicle Speed Sensor Malfunction

============8==============
P0501(D0)
Raw code: 0501D0
ECU: 7ED
Status: Test not completed since last DTC clear, Warning indicator requested
OBDII: Vehicle speed sensor (VSS) - range/performance problem
Mercedes-Benz: Vehicle Speed Sensor Range/Performance

============9==============
P0501(D0)
Raw code: 0501D0
ECU: 7ED
Status: Warning indicator requested
OBDII: Vehicle speed sensor (VSS) - range/performance problem
Mercedes-Benz: Vehicle Speed Sensor Range/Performance

============10==============
P0501(C7)
Raw code: 0501C7
ECU: 7ED
OBDII: Vehicle speed sensor (VSS) - range/performance problem
Mercedes-Benz: Vehicle Speed Sensor Range/Performance

============11==============
P2501(80)
Raw code: 250180
ECU: 7ED
OBDII: Alternator warning lamp, L-terminal - circuit high

============12==============
P0500(AB)
Raw code: 0500AB
ECU: 7ED
Status: Test failed (current drive cycle), Test not completed since last DTC clear, Warning indicator requested
OBDII: Vehicle speed sensor (VSS) - circuit malfunction
Mercedes-Benz: Vehicle Speed Sensor Malfunction

============13==============
P3004(02)
Raw code: 300402
ECU: 7ED
Status: Test failed, Test not completed since last DTC clear, Test failed since last DTC clear

============14==============
B0214(02)
Raw code: 821402
ECU: 7ED
Status: Test failed, Test not completed since last DTC clear, Test failed since last DTC clear

============15==============
P0EBD(00)
Raw code: 0EBD00
ECU: 7ED
Status: Test failed (current drive cycle), Pending, Confirmed, Test not completed since last DTC clear, Test failed since last DTC clear, Test not completed during this operation cycle

============16==============
P0073(00)
Raw code: 007300
ECU: Engine control unit
Status: Test failed, Test failed (current drive cycle), Pending, Confirmed, Test failed since last DTC clear, Warning indicator requested
OBDII: Outside air temperature sensor - high input

============17==============
P0073
Raw code: 0073
ECU: Engine control unit
Status: Pending
OBDII: Outside air temperature sensor - high input

============18==============
P0073
Raw code: 0073
ECU: Engine control unit
Status: Confirmed
OBDII: Outside air temperature sensor - high input