Issue with BMS Tune after install

[NC M550 VADER]

Installed stage 1 tune (from a forum member) on Sunday and ran into a CEL. Carly says it's "102A01. Fault Explanation: Air mass meter, signal: electrical fault."

Oddly, it didn't throw the code right away, only after restarting after initial drive. I cleared the code (and like 100+ others) at lunch today but when I started car for drive home, CEL was back and the code (and 38 others) had returned.

Any ideas?

[94jedi]

Sorry, I'm not much help but I do know that the MAF's in these cars do go bad pretty regularly.

[Chiraq M5]

What kind of tune?

[NC M550 VADER]

Originally Posted by Chiraq M5

What kind of tune?

Berger Motorsports Stage 1

[Chiraq M5]

Originally Posted by NC M5 VADER

Berger Motorsports Stage 1

Check your connection, maybe something is loose or not in place

[NC M550 VADER]

Originally Posted by Chiraq M5

Check your connection, maybe something is loose or not in place

Nope that's not it. Car running well, the tune is working. Tonight I noticed a new code. Same issue, other side.

[Chiraq M5]

Originally Posted by NC M5 VADER

Nope that's not it. Car running well, the tune is working. Tonight I noticed a new code. Same issue, other side.

Maybe the air flow sensors are loose, or faulty..

I've seen them go bad sometimes

[technician117]

"I cleared the code (and like 100+ others)"

"CEL was back and the code (and 38 others) had returned."

You shouldn't be getting tons of codes just randomly. Sounds like a DME connection isn't seated right. Did you do any work in that area recently?

[NC M550 VADER]

Originally Posted by technician117

"I cleared the code (and like 100+ others)"

"CEL was back and the code (and 38 others) had returned."

You shouldn't be getting tons of codes just randomly. Sounds like a DME connection isn't seated right. Did you do any work in that area recently?

Sunday was my first time even checking the codes as I purchased the car last fall and did not have a code reader. I assume they were from the original owner's tenure. When I ran codes again this AM, I am only getting the two that I mentioned.

[NC M550 VADER]

Originally Posted by NC M5 VADER

Sunday was my first time even checking the codes as I purchased the car last fall and did not have a code reader. I assume they were from the original owner's tenure. When I ran codes again this AM, I am only getting the two that I mentioned.

Further, all I did was to disconnect the battery, remove airboxes, make my connections for the tune (on the side of each intercooler) and put everything back together in reverse order. The plugs were all snapped into place and locked, so it isn't connection issue.

Also, car is running great, no power loss or limp mode. Just the codes and CEL.

Thank you!

[AWF10M5]

You need new MAF. Idk why but this car the MAF is made from garbage. It can go bad just by looking at them wrong lol.

I'd replace both. They were gonna go soon anyway if that's any consolation.

[NC M550 VADER]

Originally Posted by AWF10M5

You need new MAF. Idk why but this car the MAF is made from garbage. It can go bad just by removing them and reinstalling them.

Just change both now because it was gonna happen eventually anyways

Thanks for this advice. Assuming you mean MAF sensors, right? Any suggestions on where to purchase and which ones have proven to be the most reliable?

[NC M550 VADER]

Fixed. I'm an idiot, didn't reconnect MAF sensor. 😳

[Chiraq M5]

Originally Posted by NC M5 VADER

Fixed. I'm an idiot, didn't reconnect MAF sensor. 😳

I told you

[NC M550 VADER]

Originally Posted by Chiraq M5

I told you

😚😚😚😚😚

[aayaz]

I'm having a similar issue. I have both the BMS stage 1 tune as well as the BMS intakes. For me though, the air intakes are causing a CEL to stay on and i'm getting the same error code about the air mass flow sensor (too much air flow). If i put the stock air intake back, the CEL goes away. Do i need to clean the MAF sensor or replace them? Anyone else having the same setup issue?

[Chiraq M5]

Originally Posted by aayaz

I'm having a similar issue. I have both the BMS stage 1 tune as well as the BMS intakes. For me though, the air intakes are causing a CEL to stay on and i'm getting the same error code about the air mass flow sensor (too much air flow). If i put the stock air intake back, the CEL goes away. Do i need to clean the MAF sensor or replace them? Anyone else having the same setup issue?

BMS intakes are known for throwing CEL, Contact Mike he might be able to help.

I wen't with Project_Gamma Grill intakes and never seen CEL in my life.

[aayaz]

Originally Posted by Chiraq M5

BMS intakes are known for throwing CEL, Contact Mike he might be able to help.

I wen't with Project_Gamma Grill intakes and never seen CEL in my life.

Thanks! I contacted Mike and he advised me to clean the MAF and re-install them. I did that with MAF cleaner then drove the car for about 20 miles but the CEL is still on. Does anyone else have any recommendations?

[Gibbo89]

Aayaz did you resolve this problem? I just installed jb4 no boost and bms intakes on 2013 m5 and am getting same cel light and am having to clear everytime I restart engine.

Any help towards resolution would be great!

[m5teven]

Originally Posted by aayaz

I'm having a similar issue. I have both the BMS stage 1 tune as well as the BMS intakes. For me though, the air intakes are causing a CEL to stay on and i'm getting the same error code about the air mass flow sensor (too much air flow). If i put the stock air intake back, the CEL goes away. Do i need to clean the MAF sensor or replace them? Anyone else having the same setup issue?

Oiled Air Filters will cause MAF codes as well.

[aayaz]

Originally Posted by Gibbo89

Aayaz did you resolve this problem? I just installed jb4 no boost and bms intakes on 2013 m5 and am getting same cel light and am having to clear everytime I restart engine.

Any help towards resolution would be great!

I still am having the same issue! CEL is still on but no problems driving the car. I too am kind of stuck in the same situation. If i clear the code, obviously CEL goes away but comes back on a couple days later. Sometimes the code will dissapear on its own then come back so every time the car restarts the ECU is checking all components and sometimes it catches something and sometimes it doesn't. Wish i could be of more help.

[aayaz]

Originally Posted by m5teven

Oiled Air Filters will cause MAF codes as well.

I haven't oiled or clean my air filters in a few months but i also don't drive the car every day. Filters look very clean to me.