I am getting codes P1235 and P1238 on my new 156 1.9 JTDM.
I have cleaned the EGR and the MAP sensor, but I still get them.
P1235 seems to occur the first time I go over 3000RPM, then it goes to limp home mode, this morning I tested with multiecuscan, connected and found if I cleared the code and then continued driving with lots over 300RPM the error did not occur again.
The P1238 is odd as to when it is logged, this morning when I slowed down to an idle after the
P1235 it was logged.
I am going to replace all the vacuum hoses, but I am concerned this is sticking turbo vanes, or maybe I need to buy a new MAP sensor / VNT solenoid.
Here is a graph from multiecuscan, it shows actual boost pressue is always below the desired boost pressure by some way, even when P1235 is logged I never see actual boost pressure being higher than the desired value.
Here is a screenshot from multiecuscan:
Any advise would be much appreciated !