Since these forums always have been a great help for me I want to share a problem recently appeared on my 220 CDI -12.
With cold motor it all began with RPM going up and down. On the road it felt that the car lost a lot of power, within a few minutes code
P2279 (Intake Air System Leak) appeared.
Went back and erased the code. The car felt normal again but on next start to get back to home the car again felt powerless and fault codes
P0299 (Turbocharger/Supercharger Underboost) and P2279 appeared.
Since it seems to be a common problem with leaking hoses on these engines from Intercooler to Turbocharger I replaced the sealings on this one.
With cold engine all looked fine until next return with engine warm. Now code P0236 appeared (none of P0299 or P2279).
With no tools for a smoke test I found some topics where Boost Pressure Sensor (Pressure Transducer) has been faulty and replaced so I decided to order a new one to see if this was the issue.
It seems that there are 2 identical sensors on these cars - one "Pressure sensor downstream of air filter" located close to Turbocharger and one on the left of the
engine downstream of the throttle valve actuator (see attached picture).
Decided to go for a replacement for the last one. With a flexible T25 it was easy to replace.
After dismantling the old one I compared the resistance between these ones.
As you can see in attached picture the resistance between legs as below:
New sensor (A0101537228 replace A0071530028)
1-2 = 1,6kohm
2-3 = 1,65kohm
1-3 = 3,24kohm
Faulty sensor (A0071530028)
1-2 = 1,522kohm
2-3 = 807kohm
1-3 = 831kohm
After replacing this sensor, the power was back and no more error codes came up.
What is also worth to mention here is that looking for Live stream data for Intake Manifold Absolute Pressure the pressure on the faulty one never increased app 40-45 kPa but with new sensor the Pressure varied between 50-170 (during my drive) depending of throttle position.
It seems that these cars also have some problems with Manifold intake leakage but before dismantling EGR and without tools for leak search it can be worth a try to start with this sensor if similar problem happens to you! The hose between Intercooler to Turbocharger is also a common problem but this one is also easy to fix.
Hope this one can help anyone facing the same problem which happened to me
BR
Håkan
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With cold motor it all began with RPM going up and down. On the road it felt that the car lost a lot of power, within a few minutes code
P2279 (Intake Air System Leak) appeared.
Went back and erased the code. The car felt normal again but on next start to get back to home the car again felt powerless and fault codes
P0299 (Turbocharger/Supercharger Underboost) and P2279 appeared.
Since it seems to be a common problem with leaking hoses on these engines from Intercooler to Turbocharger I replaced the sealings on this one.
With cold engine all looked fine until next return with engine warm. Now code P0236 appeared (none of P0299 or P2279).
With no tools for a smoke test I found some topics where Boost Pressure Sensor (Pressure Transducer) has been faulty and replaced so I decided to order a new one to see if this was the issue.
It seems that there are 2 identical sensors on these cars - one "Pressure sensor downstream of air filter" located close to Turbocharger and one on the left of the
engine downstream of the throttle valve actuator (see attached picture).
Decided to go for a replacement for the last one. With a flexible T25 it was easy to replace.
After dismantling the old one I compared the resistance between these ones.
As you can see in attached picture the resistance between legs as below:
New sensor (A0101537228 replace A0071530028)
1-2 = 1,6kohm
2-3 = 1,65kohm
1-3 = 3,24kohm
Faulty sensor (A0071530028)
1-2 = 1,522kohm
2-3 = 807kohm
1-3 = 831kohm
After replacing this sensor, the power was back and no more error codes came up.
What is also worth to mention here is that looking for Live stream data for Intake Manifold Absolute Pressure the pressure on the faulty one never increased app 40-45 kPa but with new sensor the Pressure varied between 50-170 (during my drive) depending of throttle position.
It seems that these cars also have some problems with Manifold intake leakage but before dismantling EGR and without tools for leak search it can be worth a try to start with this sensor if similar problem happens to you! The hose between Intercooler to Turbocharger is also a common problem but this one is also easy to fix.
Hope this one can help anyone facing the same problem which happened to me
BR
Håkan
