The Bora won't start

Hi.
I've been having a problem with my Bora, manufactured in 1999, since yesterday. It won't start anymore.
It beeps and displays "immobilizer active" on the AI system. The spare key doesn't work either.
Nothing was changed on the car. No battery disconnected, no radio replacement, etc.
I once checked the error memory.

Wednesday, February 16, 2011, 21:38:41:04502
VCDS Version: RKS 10.6.3
Data as of: 20101206


Vehicle type: 1J - VW Golf/Bora IV
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
76

Mileage: 83,640 km
"Der schnelle braune Fuchs springt über den faulen Hund."
Address 01: Engine, File label: RKS\06A-906-033-APF.lbl
Part number: 06A 906 033.
Part: SIMOS33 1.6L 2V 00HS3087
Encoding: 00231
Operating number: WSC 01317
VCID: DCBD79FA66AD

5 errors found:
17831 - Bank 1; Secondary air system: Insufficient flow rate.
P1423 - 35-10 - - - Sporadically
18056 - Data bus drive: defective.
P1648 - 35-10 - - - Intermittent.
16500 - Coolant temperature sensor (G62): implausible signal.
P0116 - 35-10 - - - Intermittent.
17701 - Thermostat for map-controlled engine cooling (F265): Short circuit to positive.
P1293 - 35-10 - - - Sporadically
17978 - Motor control unit locked.
P1570 - 35-00 - -
Readiness: 0000 0000

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 03: Brakes Label file: RKS\1J0-907-37x-ABS.lbl
Part number: 1J0 907 379 P
Component: ABS 20 IE CAN 0001
Encoding: 03504
Operating number: WSC 01317
VCID: 3E79537210F1

No errors found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 08: Climate/Heating Label file: RKS\3Bx-907-044.lbl
Part number: 3B1 907 044 C.
Component: CLIMATRONIC C 0.5.0
Encoding: 01010
Operating number: WSC 01317
VCID: 2143880E814F

No errors found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 15: Airbag
Label file: RKS\6Q0-909-605-VW5.lbl
Part number: 6Q0 909 605 A
Part number: 02 AIRBAG VW5 0003
Encoding: 12338
Operating number: WSC 01317
VCID: 356B4C5E25C7

No errors found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 17: Combination Instrument
Label file: RKS\1J0-920-xx0-17.lbl
Part number: 1J0 920 822 A
Component: COMBINATION INSTRUMENT + TRIP COMPUTER. BOO V20.
Encoding: 01143
Operating Number: WSC 00000
VCID: 234F82069B53

Part number: Ident
Part number: DEPARTURE: VWZ6Z0X1257789
Identification number. DEPARTURE: VWZ6Z0X1257789

Sure, here is the translation of the text from German to English:

3 errors found:
01039 - Coolant temperature sensor (G2).
64-10 - Currently not verifiable - Sporadic.
01176 - Key
07-00 - Signal too weak.
01176 - Key
65-10 - unauthorized - occasional

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 19: CAN-Gateway Label file: RKS\6N0-909-901-19.lbl
Part number: 6N0 909 901.
Component: Gateway K<->CAN 0001
Encoding: 00006
Operating number: WSC 01317
VCID: F0E53D4A9A25

No errors found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 46: Comfort System
Label file: RKS\1J0-959-799.lbl
Part number: 1J0 959 799 AH
Component: 2K Central SG Comfort 0001.
Encoding: 04097
Operating number: WSC 01317
VCID: 840D619ABE9D

Part number: 1J1959801C
Component: 2K Throttle Controller. FS0002r

Part number: 1J1959802D
Component: 2K Throttle Controller. BF0002r

Part number: 1J4959811C
Component: 2K Throttle Controller. HL0002r

Part number: 1J4959812C
Component: 2K Throttle Controller. HR0002r

No errors found.

Sure, here is the translation of the text from German to English:

End
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I was also unable to detect any damage caused by martens.
I'll check again later today.

Right now, I only have two possible approaches left. AI malfunction or both keys lost.
What do you mean? Did I miss something?
Regards, Bolzer.

While it doesn't directly relate to the spare key issue, perhaps it could be stored somewhere near a strong magnet?

webster wrote:

While it doesn't quite fit with the spare key issue, perhaps it could be stored somewhere on a strong magnet?

Webster: How do you arrive at such a statement?
Do you know how WFS works? The chip in the key does not function like a magnetic stripe on a credit card, which can be rendered useless by a magnet.

The chip in the key is an active component...


@Bolzer: Please delete any errors and see which of the two WFS-relevant ones reappears.

I'm leaning more towards a reading coil, but we'll see.

Greetings.
Guste.

I already understand how an RFID chip works.
However, the problem still occurs!
My friend once experienced this issue with a 6N model. I suspect that the "magnetically charged" part of the key might sometimes interfere with the coil. (magnetic field -> minimal voltage disturbance?)

Hi.
I already tried to delete those errors yesterday.
There are 2 errors remaining.
01039 - Coolant temperature sensor (G2).
64-10 - Currently not verifiable - Sporadic.

Key - unauthorized.


I don't remember the numbers anymore. It was definitely not the correct key.

Regards,
Bolzer.

If an aftermarket radio is installed, reject it. Then disconnect the battery, wait 1 minute, and then test - WITHOUT connecting the radio .

Hi.
There's an LG radio installed. However, nothing has been modified on that radio, meaning it's been installed for years. Perhaps you can explain to me what's going on with it? I will try it, but I don't currently understand what the connection is.
Regards, Bolzer.

http://www.ross-tech.com/vag-com/aftermarket-radio.html

Therefore, to put it briefly, starting around 1996, radios began to be connected to the diagnostic system via the K-line. However, aftermarket radios may output 12 volts on this pin, which can short-circuit the K-line, making proper diagnostics impossible or difficult.
The car itself isn't affected by any of this, but there are problems when trying to read the data.

Hi.
Thank you for the explanation. That makes sense. I'll try it out today. The car is parked a bit further away. That's why I couldn't always try everything out right away.
I will get back to you.
Best regards, Bolzer.

Hi.
Bora is running again.
I removed the radio. I disconnected the battery. Error fixed, and it's running.
Even after several attempts to start, there are no more error messages.
Unfortunately, I can't understand why, but the K-Line (chamber 3) was not connected to the radio. An adapter plug was used, and it only had the power and ground wires connected. All other cables are not connected.

Wireless Power Cable

Let's leave the radio outside for now. Let's see if everything stays okay now.

Very competent and objective explanations.
Thank you for your help.
Regards,
Bolzer.