BMW Repair Questions? Ask a Mechanic for Answers ASAP
Dear customer, the first error code is referring to the maf (mass air control) sensor, the maf sensor is in charge of obtaining a reading of the amount of air mass passing through the intake to the engine, that first error code is telling that there is a problem in the reading of the maf sensor. Before going to proceed to verify the second turbo, I would recommend you firstly corroborate that you do not have problems of vacuum leaks in the air emission system or that there are no vacuum leaks In the area that is from the turbo to the pipes and later to the throttle body and intake manifold, I also recommend that you check the air intake manifold, all this is good to check by pouring liquid with the engine running from all edges and connections of the intake manifold, but with great care that it will not enter the turbo so as not to damage it, this is a vacuum test that is done to corroborate that if pouring liquid through the air intake the engine tries to shut down, if it is so, effectively you are in the presence of a leak in one of these pipe networks or in one of the components of the air intake system.
For the second error code, you are talking about the boost controller system, a boost controller is a device to control the boost level produced in the intake manifold of a turbocharged or supercharged engine by affecting the air pressure delivered to the pneumatic and mechanical wastegate actuator . I recommend that you also check it before proceeding to check or replace the turbo.
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Dear customer, sorr, what do you mean wht selecting neutral?
Hello dear customer, i apologize for my long delay to get back to you. I had some personal issues due the lockdown.About the release mechanism the 640 avr do not have it. You need to do it releasing the shift lever.Did you already release it?