W204 C220 CDI EML light on - help needed please

[funkymonkey]

Good afternoon all,

I've just bought my second merc, a 2013 W204 C220 CDI estate, 55k on the clock. Been driving for the last 2 weeks without any problems but driving to work 2 days ago the car felt very low on power, wouldn't rev above 2.5k, would not respond E/S shift on the gearbox and will not kick down (apparently this is the limp mode......). The following journey home, sure enough the EML light came on.

Ran a diagnostic through a generic OBD scanner and two fault codes were visible: P023714 (The boost pressure sensor has a short circuit to ground / There is an open circuit) and P0237 (Turbocharger / Supercharger boost sensor A low). I cleared these faults, EML went off and stayed off for a journey but still seemingly in limp mode. Re-read codes after second run and now showing P2279 (Intake Air system leak), along with the EML back on.

I can't hear any air leak in the engine bay. I've tried to monitor the boost pressure on the data stream but cant find a parameter relating to the boost pressure. There is a parameter that cannot be found under address 00,00,6D,09, if that means anything :S

I've monitored the intake manifold absolute pressure A, and it remains constant a 6kPa.

Can anyone shed any light on the possible cause? Is it as simple as replacing the MAP sensor and going from there, or more serious?

Many thanks for all your help!

 

[Wighty]

Return it to the garage you bourght it from under warranty ?

 

[funkymonkey]

Bought it privately.....

 

[mrmb]

Plug into the Star Diagnosis - high possibility that the sensor is faulty or loose electrical connection I wouldn't that much Plug it in to the SD and then we will see.

 

[umblecumbuz]

Is cruise control also inop?

Sent from my BG2-W09 using Tapatalk

 

[AA7861]

my car has the same issue we we changed all the sensors, issue still there, at times it goes into limp mode and does not rev past 2500

 

[Wighty]

my car has the same issue we we changed all the sensors, issue still there, at times it goes into limp mode and does not rev past 2500

You ideally need an MB independent with Star diagnostics . Where do you live buddy

 

[AA7861]

near London, do you know anyone who can help look at it?

 

[bembo449]

does this model have the electronic boost actuator , as it reads like that maybe the issue but defo get a better code reader onto the job , preferably star or MB2

 

[bembo449]

my car has the same issue we we changed all the sensors, issue still there, at times it goes into limp mode and does not rev past 2500

did you have the codes read before changing all the sensors ?

 

[Wighty]

near London, do you know anyone who can help look at it?

I can think of 4 or 5 spread around London , can you narrow down your location ?

 

[AA7861]

the car does have a electronic boost actuator,
i did have the codes read before changing sensors but local garages lack mercedes benz specialist knowledge, it comes up woth a turbo boost sensor fault, but this sensor has been replaced with a new one.

North London?

 

[AA7861]

error code P0240 Turbo/Super Charger Boost Sensor "B" Circuit

 

[alexanderfoti]

Just says that the potentially the value is incorrect. It needs diagnostic on star diag.

 

[Wighty]

the car does have a electronic boost actuator,
i did have the codes read before changing sensors but local garages lack mercedes benz specialist knowledge, it comes up woth a turbo boost sensor fault, but this sensor has been replaced with a new one.

North London?

Wayne Gates , Harrow any good ? ((North London is a big area )

 

[Richard1974]

Hi funky monkey my cars just come up with the same fault code and symptoms.. Did you find out what the problem was?
Any info would be grateful
Regards

 

[Richard1974]

Good afternoon all,

I've just bought my second merc, a 2013 W204 C220 CDI estate, 55k on the clock. Been driving for the last 2 weeks without any problems but driving to work 2 days ago the car felt very low on power, wouldn't rev above 2.5k, would not respond E/S shift on the gearbox and will not kick down (apparently this is the limp mode......). The following journey home, sure enough the EML light came on.

Ran a diagnostic through a generic OBD scanner and two fault codes were visible: P023714 (The boost pressure sensor has a short circuit to ground / There is an open circuit) and P0237 (Turbocharger / Supercharger boost sensor A low). I cleared these faults, EML went off and stayed off for a journey but still seemingly in limp mode. Re-read codes after second run and now showing P2279 (Intake Air system leak), along with the EML back on.

I can't hear any air leak in the engine bay. I've tried to monitor the boost pressure on the data stream but cant find a parameter relating to the boost pressure. There is a parameter that cannot be found under address 00,00,6D,09, if that means anything :S

I've monitored the intake manifold absolute pressure A, and it remains constant a 6kPa.

Can anyone shed any light on the possible cause? Is it as simple as replacing the MAP sensor and going from there, or more serious?

Many thanks for all your help!

 

[alexanderfoti]

Some cars give odd live values with a stored code.

What codes do you currently have?

Also, you may be monitoring the air filter map sensor.

 

[Richard1974]

Hi than

Some cars give odd live values with a stored code.

What codes do you currently have?

Also, you may be monitoring the air filter map sensor.

 

[Richard1974]

Hi than

Hi thanks for reply.. dtc po237 and po23714
Fault reading . Boost sensor A. short circuit or open circuit