boost problem

[steveyboy]

hi i have had a boost problem for weeks now, i have replaced boost sensor, map sensor, had the maf cleaned, and still have the problem its now saying boost control B malfunction.it drives great for 30/40 miles then no boost, stop engine restart and its ok again. engine warning light never comes on. any ideas will be greatly received.

 

[OneForTheRoad]

P0239 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Malfunction

P0239 code definition Turbocharger Boost Sensor B Circuit Malfunction What the P0239 code means P0239 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects an intake boost pressure sensor B input...

www.yourmechanic.com

 

[steveyboy]

P0239 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Malfunction

P0239 code definition Turbocharger Boost Sensor B Circuit Malfunction What the P0239 code means P0239 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects an intake boost pressure sensor B input...

www.yourmechanic.com

what my obd gives me are p246397 soot not ok but when i check its only 5%,also gives me p00b093 boost control B malfunction,i am at my wits end with this its becoming a money tree.

 

[OneForTheRoad]

what my obd gives me are p246397 soot not ok but when i check its only 5%,also gives me p00b093 boost control B malfunction,i am at my wits end with this its becoming a money tree.

What does the dpf pressure sensor read at tick over in live data . ?

 

[Supernoodle]

Boost control B malfunction, but sounds like you've only looked at sensors. Control means actuator.
Don't just go replacing, check the integrity of the wiring first. Look at live data, look at freeze frame data if you have a decent scan tool.

 

[steveyboy]

What does the dpf pressure sensor read at tick over in live data . ?

I will give it a go and get back too you tomorrow cheers.

 

[OneForTheRoad]

I will give it a go and get back too you tomorrow cheers.

Get live data readings for the exhaust back pressure sensor also.

 

[Tonygw]

Have you checked the pipes to the intercooler? could be split? a smoke test will confirm.

 

[steveyboy]

Get live data readings for the exhaust back pressure sensor also.

Here are the results, B28/8 diff pressure sensor=0.01 bar, B60 exhaust back pressure sensor=1.16 bar, soot 7.43g, ash 0.11g, particle 107%, air mass 549/560. Hopefully all you need as I don’t understand these figures.

 

[steveyboy]

Have you checked the pipes to the intercooler? could be split? a smoke test will confirm.

No splits all pipes checked

 

[OneForTheRoad]

Back pressure sensor should be around 14 psi at tick over , yours is nearer 17 psi. I'm not sure of the min and max levels . Maybe try taking off the connector from it and see what readings you get .

When mine gave up the ghost it was showing 65 psi.

 

[steveyboy]

Back pressure sensor should be around 14 psi at tick over , yours is nearer 17 psi. I'm not sure of the min and max levels . Maybe try taking off the connector from it and see what readings you get .

When mine gave up the ghost it was showing 65 psi.

will try anything at the moment thanks

 

[BlackC55]

Were the sensors you changed genuine MB? Aftermarket ones are useless.

Check for boost leaks. Use a smoke tester and pay very close attention to the inlet manifold.

 

[steveyboy]

Were the sensors you changed genuine MB? Aftermarket ones are useless.

Check for boost leaks. Use a smoke tester and pay very close attention to the inlet manifold.

all genuine parts

Were the sensors you changed genuine MB? Aftermarket ones are useless.

Check for boost leaks. Use a smoke tester and pay very close attention to the inlet manifold.

all mb parts had hoses checked am now trying too find back pressure sensor cannot find it watched a video and mine s not there.

 

[m80]

Look behind the EGR, atop the EGR rear casing.
Red line points to it.

24 hex to remove.

 

[BlackC55]

My best advice is to stop throwing parts at it and get it diagnosed by a specialist or dealer. Do a smoke test first. This is where teh entire intake system is filled with smoke to identify leaks. A very small one can cause your issue.

They suffer from leaks around the inlet manifolds as the bolts snap.

 

[steveyboy]

Look behind the EGR, atop the EGR rear casing.
Red line points to it.

24 hex to remove.

mines a w212 220cdi nice picture but can not recognise engine.

 

[ndwgolf]

When I changed my exhaust to a Catback Titanium exhaust system on my E53 Coupe mine would also go into limp mode (no boost) if I floored it. Quick restart and the boost would come back again same as yours except the error code I got was a P029909

 

[m80]

mines a w212 220cdi nice picture but can not recognise engine.

I would have thought yours to be the om651.
Essentially the same engine.

The photo is engine out looking from the n/s rear.

 

[steveyboy]

When I changed my exhaust to a Catback Titanium exhaust system on my E53 Coupe mine would also go into limp mode (no boost) if I floored it. Quick restart and the boost would come back again same as yours except the error code I got was a P029909
View attachment 119524

would be a great video if it was in english hard to follow.