Hello I’ve been battling a p115c code on my r56 base model for over 2 months now and I’ve just got around to replacing the throttle body. After replacing it I received a half lit check engine light code and the following fault codes of p0120, p1631, and p1637 while still receiving the p115c code. Any help is appreciated on where to go from here. Thank you.

 

Double check your throttle body installation. It may be stuck open, causing an intake air leak and a lean condition.

 

I originally had just the p115c code and was told to replace the throttlebody. The p115c code still persists after replacing the throttlebody with a used low miles unit but has more codes. Could I be looking at this the wrong way? Would it be a mass airflow issue instead?

 

All the OBDII codes suggest problems with the new throttle body. The plate may be stuck open and there may be additional intake air leaks.

You would likely obtain much more detailed information by retrieving the actual BMW fault codes.

 

Also, after installing the replacement throttle housing, did you reset the throttle plate adaptation values with a scan tool? This is an important last step of the repair process.

 

I was able to reset the adaptations with the shop’s snap-on scanner and it threw those codes immediately once again. I reverted back to the original throttle body, I will update you when I get a mass airflow sensor to test on it.

 

mass airflow sensor replaced and the vehicle continues to stall shortly after being started. No codes present thru the foxwell nt510 elite or the snap-on scanner.

 

Intake manifold has a crack by the throttle body?

https://www.northamericanmotoring.co...115c-code.html

Base (non turbo) intake manifold. https://www.ecstuning.com/Search/Sit...h/11617604597/

 

I am getting the codes p2187, p0300, p0301, p302, p0303, and p0304. Car will not idle when coming to a stop/intersection. The car will continuously shut off all power to the engine, any tips?

 

Start checking the spark, fuel, and i would look at that manifold and throttle body.

 

all checked out fine, fuel pressure is good as well, would pcv failure be something to consider?

 

Post all BMW fault codes.

P2187: Air leak in your EVAP system

https://bmwfault.codes/XMLDiagView?d...E1NTYwNzQwNQ==

 

Turns out the pcv was bad, ended up swapping to the old engine’s valve cover and the codes and check engine light turned off within a minute. The idle smoothed out as well.