Hello, I want to change classic bulbs to LED bulbs, unfortunately there is a problem with burnt bulb error. What was possible, I turned off the cold type test and other functions via VCDS. I link what I bought: LED bulbs: ? spm = a2g0s.9042311.0.0.w9NHbo PHILIPS 21W resistor: ...

Ok. The parameters on the website show that the resistance of the resistor sold is 12 / 0.94 = 12.76Ohm. The closest commercially available value is 10 Ohm or 15 Ohm. The one you bought has a power of probably 50 W (e.g. something like this to get less the heater needs to be a piece of a decent heat sink or a more powerful resistor, for example, but it's a healthy exaggeration when it comes to dimensions . Unfortunately something for something.

And what is the point of buying LED bulbs and then inserting a prosthesis in the form of a resistor so that the error does not appear?

Unfortunately, I have no choice, the LED is lit without a prosthesis, but instead of an electronic speedometer, I have a yellow bulb icon on the desktop. I personally do not like the classic bulb and it is not as visible as the LED, I mean visibility on the road, the visual effect is also a plus for LED in my opinion.

I look and my eyes do not believe so much money for two resistors, well estimate, what country tuning must cost. Can these bulbs be used in Poland?

The bulb is not meant to be liked, it has to do the job. You improve engineers? There is also such a thing as approval, and the car has a Christmas tree.

Rural tuning? Without your balls, you must have made a mistake, rural it would have been if the car was decorated with some crap, flashing nonsense. I do not change anything in the car except to change the color of the light to match the bixenon ... Yes, I regret the PLN 100 for these resistors but they were supposed to be ok. If the help on this forum is to rely on this way, thanks a lot!

Don't be angry anymore, you'll understand it someday.

I already wiped my tears calmly. And will I understand, I don't know what to understand? I figured I would get some information here, but most of it is off topic, plain spam. Thanks for the help and information, for the moment I'm staying with the classic P21W.

On the Allegro I saw that the 25 Ohm / 25W mount is not expensive so you can try it. Added after 3 [minutes]: Seemingly better because less electricity. On the other hand, they install resistors on which you need to load, i.e. lose the amount of current, because the balance for the controller must be correct so that the error does not shine.

With 25 Ohm I found the following:

Hmm, you can buy automotive shop LEDs with approval for our Polish roads . The cost is more, but the fun is when you only have the installation and connection, because the resistor is included. And so you can download applications on the smartphone, types of electrodes, something and calculate what the resistor should be

Audi A3 selection of the CANbus resistor - How to choose a resistor for LED bulb

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#1 17123312 23 Mar 2018 19:49

stratus84 stratus84

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Post #1
17123312 23 Mar 2018 19:49

Hello, I want to change classic bulbs to LED bulbs, unfortunately there is a problem with burnt bulb error. What was possible, I turned off the cold type test and other functions via VCDS. I link what I bought:
LED bulbs: https://en.aliexpress.com/item/Ground-CREE-80...-24V-car-Reversing-light-bulb/1070476831.html ? spm = a2g0s.9042311.0.0.w9NHbo
PHILIPS 21W resistor: http://sklep.led-car.pl/rezystory-canbus-do-z...-lumina-21w-do-zarowek-led-p21w-p21-5w-py21w- error-reseter-error-computer-resistor-error-error-canbus-.html

Everything works fine, there is no information about a burnt bulb but there is a high temperature, I accept a warm resistor but this one is hot ... I screwed it to a larger cold plate but it did not help. I am asking you for help in choosing the right resistor, what ohms and other values would you suggest? Links to the proposed resistors are welcome
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#2 17123351 23 Mar 2018 20:01

SQ9MEM SQ9MEM

Level 29

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Post #2
17123351 23 Mar 2018 20:01

And what is the point of buying LED bulbs and then inserting a prosthesis in the form of a resistor so that the error does not appear?
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#3 17123387 23 Mar 2018 20:12

stratus84 stratus84

Level 10

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Post #3
17123387 23 Mar 2018 20:12

Unfortunately, I have no choice, the LED is lit without a prosthesis, but instead of an electronic speedometer, I have a yellow bulb icon on the desktop. I personally do not like the classic bulb and it is not as visible as the LED, I mean visibility on the road, the visual effect is also a plus for LED in my opinion.
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#4 17123400 23 Mar 2018 20:17

osiniak75 osiniak75

Level 35

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Post #4
17123400 23 Mar 2018 20:17

I look and my eyes do not believe so much money for two resistors, well estimate, what country tuning must cost. Can these bulbs be used in Poland?
#5 17123408 23 Mar 2018 20:21

olekt2002 olekt2002

Level 31

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Post #5
17123408 23 Mar 2018 20:21

stratus84 wrote:
I personally do not like the classic bulb and it is not as visible as the LED, I mean visibility on the road, the visual effect is also a plus for LED in my opinion.
The bulb is not meant to be liked, it has to do the job. You improve engineers?
There is also such a thing as approval, and the car has a Christmas tree.
#6 17123409 23 Mar 2018 20:21

stratus84 stratus84

Level 10

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Post #6
17123409 23 Mar 2018 20:21

Rural tuning? Without your balls, you must have made a mistake, rural it would have been if the car was decorated with some crap, flashing nonsense. I do not change anything in the car except to change the color of the light to match the bixenon ... Yes, I regret the PLN 100 for these resistors but they were supposed to be ok. If the help on this forum is to rely on this way, thanks a lot!
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#7 17123418 23 Mar 2018 20:24

SQ9MEM SQ9MEM

Level 29

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Post #7
17123418 23 Mar 2018 20:24

Ok. The parameters on the website show that the resistance of the resistor sold is 12 / 0.94 = 12.76Ohm. The closest commercially available value is 10 Ohm or 15 Ohm. The one you bought has a power of probably 50 W (e.g. something like this http://www.sklep.monster.pl/10r-50w-rez-z-radiatorem-alu-canbus,4,44483,65653) to get less the heater needs to be a piece of a decent heat sink or a more powerful resistor, for example, http://www.sklep.monster.pl/10r-300w-resistor-z-radiatorem,4,44480,44181 but it's a healthy exaggeration when it comes to dimensions . Unfortunately something for something.
#8 17123442 23 Mar 2018 20:33

osiniak75 osiniak75

Level 35

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Post #8
17123442 23 Mar 2018 20:33

Don't be angry anymore, you'll understand it someday.
#9 17123477 23 Mar 2018 20:46

stratus84 stratus84

Level 10

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Post #9
17123477 23 Mar 2018 20:46

osiniak75 wrote:
Don't be angry anymore, you'll understand it someday.

I already wiped my tears calmly. And will I understand, I don't know what to understand? I figured I would get some information here, but most of it is off topic, plain spam.

SQ9MEM wrote:
Ok. The parameters on the website show that the resistance of the resistor sold is 12 / 0.94 = 12.76Ohm. The closest commercially available value is 10 Ohm or 15 Ohm. The one you bought has a power of probably 50 W (e.g. something like this http://www.sklep.monster.pl/10r-50w-rez-z-radiatorem-alu-canbus,4,44483,65653) to get less the heater needs to be a piece of a decent heat sink or a more powerful resistor, for example, http://www.sklep.monster.pl/10r-300w-resistor-z-radiatorem,4,44480,44181 but it's a healthy exaggeration when it comes to dimensions . Unfortunately something for something.

Thanks for the help and information, for the moment I'm staying with the classic P21W.
#10 17123518 23 Mar 2018 21:08

przemek25l przemek25l

Level 29

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Post #10
17123518 23 Mar 2018 21:08

On the Allegro I saw that the 25 Ohm / 25W mount is not expensive so you can try it.

Added after 3 [minutes]:

Seemingly better because less electricity. On the other hand, they install resistors on which you need to load, i.e. lose the amount of current, because the balance for the controller must be correct so that the error does not shine.
#11 17123566 23 Mar 2018 21:19

stratus84 stratus84

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Post #11
17123566 23 Mar 2018 21:19

With 25 Ohm I found the following: http://www.sklepledowy.pl/pl/c/Rezystory-Canbus/63/1/default/1/f_at_39_193/1
#12 17123980 24 Mar 2018 04:11

mateklos mateklos

Level 23

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Post #12
17123980 24 Mar 2018 04:11

Hmm, you can buy automotive shop ~~LEDs with approval for our Polish roads~~ . The cost is more, but the fun is when you only have the installation and connection, because the resistor is included.
And so you can download applications on the smartphone, types of electrodes, something and calculate what the resistor should be

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Topic summary

The discussion revolves around the challenges faced when replacing traditional bulbs with LED bulbs in an Audi A3, specifically regarding the need for a CANbus resistor to avoid burnt bulb errors. The user has attempted to disable certain functions using VCDS but still encounters issues with high temperatures from the resistor. Various participants express skepticism about the necessity of using resistors, while others provide technical advice on selecting appropriate resistors based on resistance and power ratings. Recommendations include using resistors with values around 10 Ohm or 25 Ohm, and suggestions for purchasing resistors with adequate heat dissipation capabilities. The conversation highlights the balance between aesthetics and functionality in automotive lighting modifications.
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Audi A3 selection of the CANbus resistor - How to choose a resistor for LED bulb

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