ECU 55279207 – what to know
We offer a working MJD 9DF.X1 unit (Magneti Marelli) with part number 55279207. It controls the engine of the Fiat 500L 1.3 Multijet. We test every unit before dispatch.
Label data of ECU 55279207
- Part number: 55279207
- ECU type: Magneti Marelli MJD 9DF.X1 / MJD9DF.X1
The type may be written with a space (MJD 9DF.X1) or without it (MJD9DF.X1) – it is the same type.
When the ECU may be faulty
An engine ECU failure may show up as:
- no start and no signal at the injectors,
- the diagnostic tool cannot connect to the ECU,
- the ECU gets no power even though the fuses are OK,
- problems after water damage or a short in the wiring.
Faults in the wiring, power supply or sensors can cause similar symptoms, so run a diagnosis before you buy.
Warranty and extra services
The ECU comes with a warranty of 6 months. Every unit passes a bench test and a test in our test car.
- Cloning included: instead of the Virgin version we can transfer the data from your old ECU – the data from your current unit is required.
- Paid options on request: chip tuning, EGR OFF and DPF OFF.
Virgin or IMMO OFF
- Virgin – Plug & Play: after fitting, the ECU codes itself to the car and immobiliser, no programming needed. Condition: matching part number and a working immobiliser.
- IMMO OFF on request: the car runs correctly, but a red immobiliser warning appears on the dashboard and a fault is stored in diagnostics that cannot be cleared without pairing with the immobiliser. The Virgin version does not have this fault.
Choose by part number
This ECU was removed from a Fiat 500L 1.3 Multijet. We match these ECUs by part number only, because the version is decided by the number, not by the MJD 9DF.X1 type alone. Number 55279207 on your label must match the number of this unit.
If your ECU has a different part number, check 55283481 MJD 9DF.B1, 55274938 MJD 9DF.B1, 52096056 MJD 9DF.G1, 51806333 MJD 6F3.A4 or the whole Fiat engine ECU category. About the manufacturer: FPT.
Questions and answers – ECU 55279207
Does the Virgin MJD 9DF.X1 need programming?
No. After fitting, ECU 55279207 codes itself to the car and immobiliser. The condition is a working immobiliser and a matching part number.
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What is the difference between IMMO OFF and Virgin?
With IMMO OFF the car runs, but a red immobiliser warning stays on the dashboard and a fault remains in diagnostics that cannot be cleared. The Virgin version does not have this fault, which is why we recommend it.
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How do you test ECU 55279207?
We check every unit on the bench and then fit it to our test car. The warranty is 6 months.
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Is cloning ECU 55279207 charged extra?
No, cloning is included in the price. We transfer the data from your old ECU instead of preparing the Virgin version – we need the data from your current unit.
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