How to choose ECU 51839149 MJD 6F3.H3
This is a working Magneti Marelli MJD 6F3.H3 engine control unit with part number 51839149, for the Fiat 1.3 Multijet. The unit is tested before dispatch. The housing has been refurbished – the electronics have not been repaired.
Coding to the immobiliser
- Virgin: the ECU codes itself after fitting – no programming, with a matching part number and a working immobiliser.
- IMMO OFF (on request): the car drives, but a red immobiliser warning is shown on the dashboard and a fault stays in diagnostics that cannot be cleared without pairing with the immobiliser.
- We recommend Virgin, as it leaves no fault.
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.
- Paid options on request: EGR OFF and DPF OFF.
Choose by part number
MJD 6F3.H3 units went into Fiat vehicles with the 1.3 Multijet engine. We match these ECUs by part number only, because the version is decided by the number, not by the MJD 6F3.H3 type alone. Number 51839149 on your label must match the number of this unit.
Numbers on the label
- Part number: 51839149
- ECU type: Magneti Marelli MJD 6F3.H3 / MJD6F3.H3
- Hardware version: HW04P
Useful links
FAQ: 51839149 (MJD 6F3.H3)
How do I know that 51839149 will fit?
Check the sticker on your ECU. If it shows number 51839149 and type MJD 6F3.H3 and hardware version HW04P, it is the same version. The car model and year alone are not enough.
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Does the Virgin MJD 6F3.H3 need programming?
No. After fitting, ECU 51839149 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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What is the warranty on ECU 51839149?
The warranty is 6 months. Before dispatch, the ECU passes a bench test and a test in our test car.
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