2004 MCS:
I keep on getting "ALERT!" display on my stock CD Receiver for past 3 days. The volume would also go up and down on its own and switches from CD to radio by itself.
I have Alpine KTP 445 amp and MTX RT8PT powered subwoofer since June 2013.

Did anyone experience this and how did you fix it? TIA


2004 R53 MCS CD-Receiver Stereo

 

While researching the web, I found that BMW cars have common issue as mine too not has not happened to my old E46 330i.

 

I have seen "disabled", but not "alert" .

I would swap out the stock head unit with another stock one and see what happens, maybe a bad deck?

 

Update: Mar 25
I scanned my car for Health Check using my Thinkdiag TKD01 and cleared few codes but not the P0420 (this has been on and off for many years but no effect on performance or fuel economy) and now I also got P2096.
To my surprise, the "Alert" warning in my CD-Receiver is gone and RDS is back (name & artist of the song on display). The musical volume is also now stable from switching high & low by its own.

Now, I have to figure out what's causing the P2096 & P0420 codes.

 

Thats good, maybe just a glitch?

P0420 catalytic converter efficiency is below threshold (Bank 1) pad upstream 02 sensor.

P2096 Bad down stream O2 sensor.

https://www.northamericanmotoring.co...their-r53.html

When mine went bad i could see my mpg drop. Right before the light/Pcode came on.

 

@ECS Tuning . Thank you for being always helpful to our NAM forum over many years.
I will give that a try.
The P0420 has been there for many years as I have the Mynes 4:1 sports headers with 200 cell cat. I also have the O2 spacer but still a hit and miss over the years.
Maybe it's time to change my OEM downstream O2 sensor and hope it will fix this P2096. My 2004 MCS was bought new and has only 70K kms to date.

 

Glad to help!

Oh thats makes sense.