List of Errors || which of these are critical and which are minor

Hi fellas
Appreciate it if you can go through this error list and tell which ones are fatal and which ones are harmless. These are of a vehicle I took for a diagnostic test today (prospective buy) I posted about the same vehicle last week as well (http://www.mybmwi3.com/forum/viewtopic.php?f=3&t=5263)

https://ibb.co/jKmrx8
https://ibb.co/cucWx8
https://ibb.co/i6TtAT
https://ibb.co/n2VvPo
https://ibb.co/cUVJc8
https://ibb.co/kviFPo


As you can see from the pictures there were 49 outstanding errors and I suspect some of those are due to bad 12v battery. But the question is which ones are major errors and which ones are trivial ones. We cleared all fault memory and had a brief test drive (about 4 kms) to check whether any errors reappear after driving. Only the following three codes reappeared even after the test drive

8040BD Terminal 30F reset or deactivated
804398 Automatic air recirculation control (AUC) sensor: line disconnection or short cct,
804399 Automatic air recirculation control (AUC) sensor: Invalid PWM signal

https://ibb.co/gmjuH8

I guess the two about AUC sensor are minor ones though I’m not sure about the one about Terminal 30F.

Appreciate it if anyone of you who are familiar with these codes can share information about those. I want to know the scale of what I m going to get into and gotta decide whether to steer clear from it or to make the plunge.

I would be more interested in a list of recurring errors. Clear the existing and then list codes that come back. Turn off and on the car and list the new codes. Attempt to go into READY and report the new codes.

First we diagnose those that come back immediately after clearing. These are faults that can inhibit everything else.

Second we diagnose those that come back after power cycling the car. These faults can inhibit going to READY.

Finally we diagnose those that show up when attempting to go into READY. There may be another set that shows up AFTER going into "D".

So is this a salvaged BMW?

Bob Wilson

Hi Bob, These three are the recurring ones. i mean the at least those reappeared after the brief test drive we had. Since the vehicle is back with the current owner now, i dont know how many of those have reappeared by now.

DRK002 said:

We cleared all fault memory and had a brief test drive (about 4 kms) to check whether any errors reappear after driving. Only the following three codes reappeared even after the test drive

8040BD Terminal 30F reset or deactivated
804398 Automatic air recirculation control (AUC) sensor: line disconnection or short cct,
804399 Automatic air recirculation control (AUC) sensor: Invalid PWM signal

https://ibb.co/gmjuH8

I guess the two about AUC sensor are minor ones though I’m not sure about the one about Terminal 30F.

Click to expand...

In fact this is not a salvaged one. Someone that had been cosmetically looked after rather well by the owner. But not mechanically/technically. It is a parallel import without agent warranty. (which is not uncommon where i live) There aree some parallel imported vehicles that are maintained by independent/non-agent professionals which are in very good condition. But this one unfortunately looks like a one that is not one of those.

FWIW, the i3 requires minimal service. Most software updates are more for adding or tweaking features rather than actually fixing things (although some are). Once past say the first couple of months, electronics tend to be past the infant mortality stage, and continue to work for a long time unless abused.