My R55 is at the dealer and is retrieving code 2BD2 which is equivalent to a SAE P0697 ("Sensor Reference Voltage C Circuit/Open"). Mini Has no clue what the problem is. Mini's diagnostic software shows the same description as this guy: https://www.northamericanmotoring.co...e-failure.html

"P2BD4 - DME: Monitoring, Power Supply 3, Sensor CY320"


Code instantly reappears if cleared.
Code references the CY320 which is the bosch voltage monitor chip inside the DME.


Any help appreciated.

-Phil

 

Phil,
what year is the car and is it an "S" or "non S"

I had similar, but not exactly the same codes telling me sensors were not good yet every sensor checked fine when tested or replaced. The problem ended up being a blocked intake tube to the filter box. Three MINI dealers and two independent shops could not figure it out.

Took me 10 minutes of my time to correct the problem that NONE of them noticed.

 

Build date 2/2008

Clubman S

What was it blocked with? Oil, Crud?

 

Here is the thread about it.

https://www.northamericanmotoring.co...-be-wrong.html

Let me do some digging on the code. are there any others showing up. Many times if the code is odd like yours there is more than one and can sometimes be hard to read.

 

Some Generic help on this is that the ECM has detected has detected an out of voltage range on the 5 volt reference circuit 3

 

Oh dang thats funny!

2 of your codes are the same fault which is why the dealer has no clue what a P12A3 is. Mini stores both so they can be OBDII/CAN compliant and still have their proprietary diags.

SAE P12A3 maps to mini code 28A5

 

I have:DIS, ISTA, and Bentley manual at my disposal and I haven't found a way to tell what circuit C is in terms of what sensors are hooked to that line or even what pin circuit C maps to on the ECU.

 

Any updates on this? Currently have same problem R56 Cooper-S. Think it needs a new DME :s

 

Yes, it took a DME replacement to solve mine. Car also had a bad alternator. It still charged but the voltage sense line was causing a code as well. You should replace the DME and sell the car these mini's are highly flawed and engineered to take your money and not be user serviceable.

If you end up needing an alternator I ended up with an extra I would sell.

 

I replaced the DME and these codes went away. But the main issue was the car idles very poorly and engine shuts off unless I raise rpm to 1500-2000.

The pre-cat oxygen sensor readings are very low, car is running too lean.
Sometimes triggers O2 pre-cat sensor plausibility, and Too Lean.

I disconnected the sensor and still same idling problems ...no other error codes.