Engine will not stay running, codes P1553, P1554, P0369, P0102, P0140, P0015

Here is the breakdown of these codes:

P0015 - Cam Bank 1 over retarded
P0102 - MAF circuit low
P0140- O2 sensor no activity Bank 1 sensor 2
P0369 - Cam Bank 1 circuit intermittent
P1553 Engine position performance bank 1
P1554 - Engine position performance Bank 1

Based on all these and what you are experiencing, it appears the engine is out of time. The backfire was probably when the engine jumped timing and shut off. Unfortunately we are going to need to pull down the engine and check the timing.

I attached the process on how to check the timing. Please let me know if you have questions and we can from there. Thanks

Unfortunately we don't have a video on this engine. The best I can do are the instructions I provided. I looked online for a video but could not find one on your engine assuming you have the M54 engine. Is this accurate or do you have a different engine?

We do not have a video on this engine either, but here are three videos that I found on the internet that have other DIY'ers and a business that works on BMW's running through this.

I am sure if these don't give you the detail that you are looking for, I am sure there are others.

https://www.youtube.com/watch?v=A0pXlYMht2Y

https://www.youtube.com/watch?v=16PIln67iIQ

https://www.youtube.com/watch?v=v-5szBSSOSI

Please let us know how you make out with this. Thanks

The most common cause of an engine to jump timing is a loose chain/belt. This could be due to it being stretched or more likely the tensioner is not keeping the proper tension. The other common cause is the chain/belt and sprockets are worn and when tension is put to them, they can't hold it and they jump a tooth or two.

Basically the only way to know is tear it down and check the tension and then inspect for worn components mentioned above.

Let me know if you have questions. Thanks

Okay. These codes are as follows

P0012 - Intake cam bank 1 timing does not correspond with ECM expectation
P0102 - MAF signal performance outside the proper range.

If the timing is correct then we need to inspect the sensor itself for the P0012. The MAF is most likely different then the cam sensor code but if it were me, I would start with this one and if it is gone and the intake cam code is still there then you can address it.

More than like the MAF sensor is failed and needs replaced. However, here is a process on how to clean it. I would start with this and see what codes come back.

https://www.2carpros.com/articles/mass-air-flow-service

Okay. The P1124 is a throttle position sensor out of range.
P0205 - Is an injector circuit out of range.

The fuel pump only having 7.5 volts is normally caused by resistance in the circuit or a faulty ground. The ground is X494 which is behind the right rear seat. I would suggest taking the fuel pump relay out and unplug the fuel pump, then measure resistance from Pin 87 from the relay to the fuel pump connector. You should have less then a half ohm of resistance.

Then check the ground and make sure it is clean and tight.

It is unlikely that all would fail at the same time. What were the readings you were getting on the primary and secondary side of the coils?

Your primary side should be around 1 ohm. The secondary side could vary depending on the coil as you saw in that video. As long as you are getting between 5,000-20,000 ohms of resistance, it should be okay.

If you have 0 resistance, I assume you mean it is an open circuit. Clearly that is not correct but I am concerned it is how you are checking for this resistance because of how unlikely it is for all 6 to fail the same way. Are you checking from the terminal when they plug in and then on the part that is in the boot that connects to the spark plug?

If you are and you have no resistance, then they are all failed.

Wow. I was just checking because it was not really clear that he changed positions when taking the secondary side.

I am surprised but if that is how it is then they are failed. Well done.

I test the secondary coil resistance the same way as that video showed. There really isn't another way. So yes. If the coils are not able to produce the high voltage needed in the secondary side then you will have a very poor and weak spark. If all 6 are this way, I doubt the engine would start. If it did, it would run really poor.