12 hours ago, pmdc199 said:

you are good. I found that out too yesterday. The Bilstein lists it as BT part ending. That’s why I want to physically compare them.

But even the drawings on the vw catalogue lists more spring codes. 
 

I also wonder what the technical difference is between the coils for estate and hatch back.

 

Are the estates a larger diameter?

 

The hatchback and estate rear springs will be physically almost identical. They will both have an outside diameter of about 112mm and are interchangeable, ie. they will physically fit on either car.

 

Spring Design	Coil spring with constant wire diameter
Fitting Position	Rear Axle
Thickness	11,75 mm
Length	330 mm
Outer diameter	112 mm
Weight	1,85 kg

 

https://web.tecalliance.net/gkn/en/parts/1/86744/detail?query=1K0511115BS&numberType=1&oe=1K0511115BS&groups=188#@brc/search:Search%20by%20any%20number%201K0511115BS;mandator:gkn;query:1K0511115BS;groups:188;brands:1;pf:2;page:0/detail:86744;brandId:1;articleNo:86744;mandator:gkn;query:1K0511115BS;numberType:1;oe:1K0511115BS;groups:188

 

The Skoda online parts catalogue lists eleven different rear springs for the lowered/sport suspension Octavia MK2 as follows:

 

1K0511115BQ Model data: PR-1JC+0YC

1K0511115BR Model data: PR-1JC+0YD

1K0511115BS Model data: PR-1JC+0YE

1K0511115BT Model data: PR-1JC+0YF

1K0511115CA Model data: PR-1JC+0YG

1K0511115CD Model data: PR-1JC+0YK

1K0511115CE Model data: PR-1JC+0YL

1K0511115DG Model data: PR-1JC+0YH

1K0511115DH Model data: PR-1JC+0YJ

1K0511115GB Model data: PR-1JC+0YA

1K0511115GC Model data: PR-1JC+0YB

 

Notice that alongside each OEM number is a PR code. This is a build code, ie. what the car left the factory with. Some cars have a build codes sticker in the boot somewhere. Not all the build codes/PR numbers are listed on this boot sticker so may or may not show the PR code for what rear springs the car left the factory with. You may be able to ask a local Skoda dealer for a printout of all the PR codes. The PR codes will show things like what springs, shock absorbers, brake discs, etc. the car left the factory with.

 

If for example, your car had PR code 1JC+0YE then that would mean that your car left the factory with 1K0511115BS rear springs.

 

Here's another way of finding the OEM number of your rear springs. If your car has original rear springs, you can read the coloured dots and by reference to a chart find the OEM number of the rear springs. For example, if your rear springs have 1 blue dot and 1 yellow dot, then that would mean that your rear springs have OEM number 1K0511115BS. The Skoda online parts catalogue lists the coloured dots alongside the OEM number of the rear springs.

 

http://www.oemepc.com/skoda/part_single/catalog/sk/markt/CZ/modell/OCT/year/2010/drive_standart/663/hg_ug/511/subcategory/511020/part_id/2561497/lang/e

 

You can use the gknautomotive online spring catalogue to see a list of cars that the above eleven OEM springs were fitted to out of the factory. For example, seaching for the 1K0511115BQ OEM number in the search box on the link below (ie. gknautomotive online catalogue) brings up the vehicle linkage. Click on VW or whatever other make it lists and you will see a list of cars that came out of the factory with that spring. 1K0511115BQ for example, lists lots of VW Golf MK5 hatchback 3-door cars with sports suspension. So for a Skoda Octavia MK2 hatchback with sports suspension, eg. RS model, that spring would probably be a little too light.

 

https://web.tecalliance.net/gkn/en/parts/1/87127/detail?query=1K0511115BQ&numberType=1&oe=1K0511115BQ&groups=188#@brc/search:Search%20by%20any%20number%201K0511115BQ;mandator:gkn;query:1K0511115BQ;groups:188;brands:1;pf:2;page:0/detail:87127;brandId:1;articleNo:87127;mandator:gkn;query:1K0511115BQ;numberType:1;oe:1K0511115BQ;groups:188

 

 

Edited 11 December, 20205 yr by Carlston

There has been a discussion in the beginning of this thread about the right type of front spring for Octavia 2. 
It was stated that for a Skoda Octavia MK2 hatchback 1.6TDI with automatic transmission and standard suspension, the right part would be 1K0411105BC (1 Violet 1 Orange 2 Blue Dots). This is supported by catalog and also some owners on internet. Also some manufacturers list 1K0411105BC for automatic transmission. Just like @Carlstonsaid.
Now here is a curious fact.
A suspension coil spring (front axle) broke on my Skoda Octavia 2 FL DSG (2010), 1.6 TDI CR (CAYC) Hatchback, VIN TMBCT21Z1B8011736. 
Suspension is regular (not sport), with automatic DSG transmission. The broken spring is the original one, it has 3 color marks: purple(deep pink), orange, blue, so it corresponds to 1K0411105AQ.
Local repair shop replaced it with another 1K0411105AQ. 
I also did an inquiry by email about the right part number based on VIN and around 10 Skoda authorised repair shops from all around Europe indicated 1K0411105AQ, without exception. 
So how can I have 1K0411105AQ and not 1K0411105BC?

@FeriM

I cannot access details on your VIN, however the car will be given the correct spring at manufacture based on the axle weight which will vary with the various optional equipment required for the particular build, so you can't assume there is just one spring used for a certain model.

9 hours ago, FeriM said:

There has been a discussion in the beginning of this thread about the right type of front spring for Octavia 2. 
It was stated that for a Skoda Octavia MK2 hatchback 1.6TDI with automatic transmission and standard suspension, the right part would be 1K0411105BC (1 Violet 1 Orange 2 Blue Dots). This is supported by catalog and also some owners on internet. Also some manufacturers list 1K0411105BC for automatic transmission. Just like @Carlstonsaid.
Now here is a curious fact.
A suspension coil spring (front axle) broke on my Skoda Octavia 2 FL DSG (2010), 1.6 TDI CR (CAYC) Hatchback, VIN TMBCT21Z1B8011736. 
Suspension is regular (not sport), with automatic DSG transmission. The broken spring is the original one, it has 3 color marks: purple(deep pink), orange, blue, so it corresponds to 1K0411105AQ.
Local repair shop replaced it with another 1K0411105AQ. 
I also did an inquiry by email about the right part number based on VIN and around 10 Skoda authorised repair shops from all around Europe indicated 1K0411105AQ, without exception. 
So how can I have 1K0411105AQ and not 1K0411105BC?

 

1K0411105BC front springs are what most aftermarket spring catalogues list for the Octavia MK2 1.6TDI with automatic transmission. This is probably incorrect, as the correct front springs are probably 1K0411105AQ.

 

If someone had fitted 1K0411105BC instead of 1K0411105AQ, they would have found that their ride height had increased slightly and the new front springs were a little stiffer than before.

 

Aftermarket spring catalogues will often suggest a different OEM part number to what Skoda fitted in the factory. This is why it's worthwhile finding out what springs the car left the factory with and not just relying on what the aftermarket spring catalogues suggest.

 

Edited 1 September, 20223 yr by Carlston