What Is ECU 04E907309FT and Which Cars Use It?
The Bosch 04E907309FT is a new OEM engine control unit for EA211 TSI engines — here's how to identify it, cross-reference it, and buy the right one for your car.
What Is the 04E907309FT ECU and Which Vehicles Use It?
The Bosch 04E907309FT is a new original engine control unit (ECU) running the Motronic MG1CA811 software platform. It is designed for Volkswagen Group vehicles fitted with the EA211 1.2 and 1.4 TSI engine family — a widely used petrol unit found across the VAG lineup.
Based on available fitment data, compatible vehicles include:
- Volkswagen Polo VI (AW) — 1.0 TSI variants
- Volkswagen Golf VII / VIII — 1.0 TSI variants
- SEAT Ibiza V (KJ) — 1.0 TSI variants
- ŠKODA Fabia III / Scala — 1.0 TSI variants
⚠️ Important: EA211 engines were used across many model years and power outputs, and ECU part numbers are highly application-specific. Compatibility must be confirmed by full VIN before ordering. Do not rely solely on engine code.
You can view and order this part directly here: Bosch ECU 04E907309FT – MG1CA811 EA211 New
How to Identify It by OEM Number and Label Markings
On the ECU housing itself, look for the following:
- VAG OEM part number:
04E 907 309 FT(may appear with or without spaces) - Bosch hardware/software reference: typically printed on a label on the unit's casing alongside a barcode
- Motronic platform: MG1CA811 — this may appear on the ECU label or in diagnostic software when the unit is read
When comparing a replacement ECU to your old unit, match the full part number including the suffix letters (e.g., FT). Variants like 04E907309AK or 04E907309BT are different part numbers and may not be interchangeable.
Cross-Reference Numbers
No third-party or alternative OEM cross-reference numbers are confirmed for this specific suffix at this time. The table below reflects what is currently known:
| Reference Type | Number | |---|---| | VAG OEM | 04E 907 309 FT | | Bosch platform | Motronic MG1CA811 | | Aftermarket cross-ref | Not confirmed |
Always use the OEM number to search. Browse other electronics parts at AutoParts EU if you need related components.
What to Check Before Buying This ECU
Before placing your order, confirm the following:
- VIN verification — ECUs within the EA211 family differ by engine output, gearbox type, emissions standard, and regional market. Always have your VIN checked against the part number.
- Condition of your existing ECU — Have it diagnosed first. Confirm the ECU itself is the fault, not a wiring, sensor, or injector issue.
- Coding requirements — New OEM ECUs typically require dealer-level coding/programming after installation. Budget for this with a VAG-capable workshop.
- Part number suffix match — Ensure the suffix FT matches exactly what your vehicle requires per VIN lookup.
- Immobiliser/security pairing — On VAG vehicles, the ECU, instrument cluster, and immobiliser are often paired. Replacement may require adaptation via VCDS or ODIS.
FAQ
Is the 04E907309FT a plug-and-play replacement?
No. While it is a new original unit, all VAG ECUs require programming and adaptation after installation. A generic swap without coding will typically result in a no-start condition due to immobiliser security.
Can I use this ECU if my car has a different 04E907309 suffix?
Not necessarily. Different suffix letters indicate different hardware or software configurations. Always verify via VIN — do not assume suffix variants are interchangeable.
How do I confirm this part fits my specific car?
Use the VIN-based compatibility check available on the product page or contact the AutoParts EU team before ordering. The EA211 engine spans many configurations, and the correct ECU number is VIN-specific.