I’ve been working on this mod for a long time. The idea is to replace the standard Ibiza 6L instrument cluster with one from a VW Polo 9N or 9N3, which features a FIS display (Fahrerinformationssystem) — a small info screen showing real-time fuel consumption, range, external temperature, open door indicators, radio and nav info.

I did this on my Ibiza 6L 1.4 TDI. A lot of the background knowledge comes from the communities at POLOVW.IT and IbizaTuningClub.com.

Is it physically compatible?

Yes. Despite the Ibiza 6L using a TRW cluster and the Polo 9N using a VDO one, the connector pinout is identical — both use the same green T32 and black connectors. You can plug the Polo cluster straight in. The challenge is immobilizer coding, firmware differences, and a couple of mechanical quirks.

Requirements

• A FIS instrument cluster from a VW Polo 9N or 9N3 (used on eBay, ~50-200 EUR)
• VCDS interface and software — do NOT use vag-com 311 or 409, there is a known bug that breaks the instrument adaptation procedure
• Soldering iron (max 30-40W, fine tip) + desoldering wick + tweezers
• SOIC-8 clip programmer for the 93c86 EEPROM chip
• EEPROM read/write software (ICProg or VAG EEPROM Programmer v1.8+)
• Gearbox speed sensor for the Polo 9N (~56 EUR) — see Step 5

1 - Choose the right cluster

A few things to check before buying:

• The Polo 9N and 9N3 clusters are interchangeable — same connectors, only graphics differ
• Part numbers I used: 6Q0 920 825 F, 6Q0 920 821, 6Q0 920 822 F
• The fuel gauge needle runs in the opposite direction compared to the Ibiza layout — the dial face will need modification (see Step 6)
• If buying used, try to get the login code from the seller — it saves a lot of hassle

2 - Backup softcode/coding from your original cluster

Before removing anything, connect VCDS and go to module 17 — Instruments. Write down the softcode/coding (5-digit value). You will need it to recode the new cluster.

3 - Transfer the EEPROM data

This is the most involved step. The EEPROM chip on the cluster board is a Microwire 93c86, soldered directly — not socketed. It stores immobilizer binding and mileage data.

What you need to do is a dump mix: copy the relevant data (VIN, immobilizer keys, engine type) from your original Ibiza cluster dump into the new Polo FIS cluster dump.

Option A — Via cable (try this first):

Use VAG EEPROM Programmer v1.8 with a standard VAG cable. This is confirmed working on Ibiza 6K. On the 6L I had to go physical, but it is worth trying first.

Option B — Physical desoldering (what I did on the 6L):

1. Disassemble both clusters
2. Desolder the 93c86 EEPROM from both boards — use desoldering wick and a fine-tip iron, be patient
3. Read both chips with the SOIC clip programmer + ICProg
4. Mix the dumps: copy VIN, immobilizer and engine data from the original Ibiza EEPROM into the Polo FIS cluster dump. The exact byte offsets are documented in the PDF originally from the Polo forum (search for “Riprogrammazione tachimetro MFA FIS immo3”)
5. Write the modified dump back to the Polo cluster EEPROM
6. Resolder the chip — take your time

With this approach you can also preserve your correct mileage. With the VCDS-only methods the mileage from the used cluster stays as-is.

Alternative — VCDS adaptation (no soldering):

If you have the login codes for both clusters (original and replacement), you can do everything via VCDS following the Ross-Tech instrument cluster adaptation procedure. If key learning does not transfer automatically, a separate key match procedure is needed. SEAT dealers can also handle this if they have VAS online access to retrieve both login codes using the chassis numbers.

4 - Coding with VCDS

Mount the Polo FIS cluster in the Ibiza. Then with VCDS:

1. Go to module 17 — Instruments
2. Run coding and enter the softcode you saved in Step 2
3. Check adaptations if needed

Step 5 - Install the gearbox speed sensor

On the Ibiza 6L, vehicle speed travels over CAN bus — pins T32/5 (speed output) and T32/6 (speed input) on the original cluster are unused. The Polo 9N cluster however expects a physical speed sensor on the gearbox. Without it the speedometer will not work.

The sensor I sourced cost 56 EUR and required some trial and error to find the right part — the housing has to physically fit the Ibiza gearbox mount, which is not guaranteed across all variants. Once installed, it connects to pins T32/5 and T32/6 on the cluster T32 connector.

The full Ibiza 6L T32 connector pinout for reference:

1  - Immobilizer reader coil
2  - High beam indicator
3  - Low beam indicator
4  - Oil level sensor
5  - Vehicle speed output
6  - Vehicle speed input
7  - CAN L (engine)
8  - CAN H (engine)
9  - CAN L (comfort)
10 - CAN H (comfort)
11 - MFA indicator
12 - MFA indicator
15 - Fuel level sensor
16 - Coolant level sensor
17 - Immobilizer reader coil

6 - Fix the dial face

Because the Polo cluster layout differs from the Ibiza — the fuel needle runs the opposite direction and warning light positions are different — you cannot use the Polo dial face as-is.

I reused the Ibiza plastic housing with a cut-and-splice job: I cut the central section from the Ibiza plastic frame and the central portion of the Ibiza dial face, then fitted them into the Polo cluster frame. It works, but requires precise cutting. Ideally you would get a custom dial face produced — there are specialist companies that can do this.

Notes

• SEAT dealers will often tell you it is not possible to recode a used cluster — it is. They need both login codes and a VAS with factory online access
• Always document your real mileage before and after the swap
• A step-by-step guide from the Italian VW Polo Club can be found in this archive (it’s in italian) MFA_FIS_immo-3.zip

That’s it! If you have questions, leave a comment.