Check engine light and I've got a track weekend tomorrow :(

[ShadeD1]

I just started getting a Service Engine Soon light when I left the office. I ran Bavarian Technics and got the codes below.
I am a sh*tty mechanic and have no idea what this means, any help would be appreciated....most importantly can I leave for MSR Cresson tomorrow or do I need to take it in right away.


Engine module for S65 (M3)

Current Fault Codes
2739:
Air mass meter secondary air elec diagnosis
Error will cause a warning light
Error is currently present
Test conditions have been completed
Signal or value below threshold


27C5:
Air mass meter secondary air implausible
Error will cause a warning light
Error is currently present
Test conditions have been completed

[jml]

You're fine. I ran TWS last weekend with the same code thrown. No issues.

[ShadeD1]

Sweet!...Thanks you saved my 45th BDay weekend

Originally Posted by jml

You're fine. I ran TWS last weekend with the same code thrown. No issues.

[dnvrdrvr]

Did you ever find out what the cause of the codes was? I ask because Friday afternoon I got the old "Increased Emissions" at 4:40pm. Called the dealer to see if they could just read to code and tell me if it was safe for this past weekend's "road trip" and they told me no, but they said as long as the Service Engine light was yellow, it was fine (which mine is). So I drove it like I stole it all weekend and never had any mechanical issues.

Weird thing was, no error Saturday. But it popped back up Sunday. I already have an appt for Weds, just curious what your failure was due to and if mine is the same.

Edited to add: I know it's NOT because the gas cap is loose....

[dnvrdrvr]

SA just called and said I needed a secondary air pump replaced. I know it's OT for this subforum, but does anyone know what that part does? And what would cause it to fail?

[ShadeD1]

No Problems at all over the weekend. Well, except for this....

[Jaypod]

^^^^ Congrats on the upcoming BBK!!!

Just kidding

Did you feel it happen or did you notice it after the session? That is quite the failure.

[Jaypod]

Originally Posted by dnvrdrvr

SA just called and said I needed a secondary air pump replaced. I know it's OT for this subforum, but does anyone know what that part does? And what would cause it to fail?

I *think* the secondary air pump is only used for cold starts to provide fresh air to the cats. Not sure what would cause it to fail other than it being an electric part which would no doubt fail eventually.

[r53s65e90]

Originally Posted by ShadeD1

No Problems at all over the weekend. Well, except for this....

What rotor is this?? It is not the stock rotor.

[OC3]

[signes]

Performance Friction. See this thread:

http://www.m3post.com/forums/showthread.php?t=532815

[Zba]

Originally Posted by Jaypod

I *think* the secondary air pump is only used for cold starts to provide fresh air to the cats. Not sure what would cause it to fail other than it being an electric part which would no doubt fail eventually.

Correct, sends O2 into the exhaust stream on a cold start (rich condition) to help burn off excess hydrocarbons (unburned fuel). In it's location above the engine it is exposed to some pretty high temps, so yeah...
Back on topic!

Crazy rotor!

[dnvrdrvr]

Originally Posted by Zba

Correct, sends O2 into the exhaust stream on a cold start (rich condition) to help burn off excess hydrocarbons (unburned fuel). In it's location above the engine it is exposed to some pretty high temps, so yeah...
Back on topic!

SA confirmed ^. I also got new spark plugs, diff fluid change & an oil change. Car feels great!