Skip to main content
English / €
Products in the cart: 0. See details

Your cart is empty

51840854B 0261201759 VIRGIN ECU Engine controller FIAT 500 51840854

BOSCH

Bosch ECU 0261201759 for Fiat 500 1.2 8V – VIRGIN Plug & Play Version

51840854B / 51840854 / 0261201759 is a tested ECU ENGINE CONTROLLER for the Fiat 500 1.2 8V, prepared in VIRGIN Plug & Play version. After installation, the module automatically adapts to the vehicle and immobilizer system.

Go to full description
Fast delivery of ECU engine unit – within 1–2 working days
English / €
with VAT without VAT
Price €211.87
incl. 23% VAT

Shipping costs are not included in the price.

Shipping from €42.37 - UPS express delivery around world (Afghanistan)

express delivery 3-6 days

You can choose an additional variant

Individual variants may differ in price

pcs
Availability:
available
Ask about the product

info

Information

  • CAR MODEL FIAT 500
  • ENGINE 1.4
  • OEM: 51840854B 0261201759
  • PART NUMBER 51840854
  • PLUG AND PLAY VIRGIN
  • WARRANTY 6 MONTH
  • TESTED Second hand product
  • PAYMENT: Credit Card , Bank Transfer , PayPal
  • EXPRESS DELIVERY – in EU Countries: European Union 2-3 working days
  • INTERNATIONAL DELIVERY – Outside EU Countries: Worldwide 4-7 working days

description

51840854B 0261201759 – Fiat 500 1.2 8V engine ECU VIRGIN Plug & Play

The engine ECU has been professionally prepared as VIRGIN Plug & Play, allowing automatic synchronization with the vehicle and immobilizer after installation.

Application of engine ECU 51840854B

  • Brand: Fiat
  • Model: Fiat 500
  • Engine: 1.2 8V petrol
  • Engine capacity: 1242 cm³
  • Engine code: 169A4000
  • Model years: approximately 2007–2015
  • Manufacturer: Bosch
  • ECU type: engine ECU
  • Version: VIRGIN Plug & Play

Part numbers for comparison

  • 51840854B
  • 51840854
  • 0261201759
  • 0 261 201 759

The ECU should always be matched primarily by part number. Different ECU versions were installed in Fiat 500 models, therefore compatibility must be confirmed using 51840854B and 0261201759.

51840854B module prepared as VIRGIN Plug & Play – what does it mean?

The offered ECU has been prepared as VIRGIN, meaning all data from the previous vehicle has been removed. After installation, the module automatically programs itself to the vehicle and immobilizer, eliminating the need to clone the original ECU.

Typical faults of Fiat 500 0261201759 ECU

  • engine does not start,
  • CODE warning light or immobilizer errors,
  • no communication with ECU,
  • rough running of the 1.2 8V engine,
  • vehicle stalls while driving,
  • ignition or fuel injection control problems,
  • faults caused by short circuit or liquid damage,
  • no control of ignition coils.

Tested ECU with warranty

Every 51840854B Bosch 0261201759 engine ECU is individually tested and verified before shipping. The module is supplied with warranty and prepared for installation in the vehicle.

FAQ – Fiat 500 engine ECU 51840854B 0261201759

Does ECU 51840854B fit Fiat 500 1.2 8V?

Yes, the 51840854B ECU is used in selected Fiat 500 models equipped with the 1.2 8V petrol engine. Matching the exact ECU number is essential.


What does VIRGIN Plug & Play mean in Fiat 500 ECU?

VIRGIN Plug & Play means the ECU has been reset and after installation automatically adapts itself to the vehicle and immobilizer.


Does Bosch ECU 0261201759 require coding?

No. The offered 0261201759 ECU has been prepared as VIRGIN Plug & Play and automatically adapts to the vehicle after installation.


What are the symptoms of faulty Fiat 500 ECU 51840854?

A defective 51840854 ECU may cause no start condition, immobilizer errors, lack of diagnostic communication or unstable engine operation.


Is ECU 0261201759 tested before sale?

Yes, every Bosch 0261201759 ECU is individually tested before shipping and covered by warranty.


Can ECU 51840854B be matched only by vehicle model?

No. The ECU should always be matched using part numbers 51840854B and 0261201759, because different ECU versions exist in Fiat 500 models.


Does Fiat 500 VIRGIN ECU solve immobilizer problems?

Yes, the VIRGIN Plug & Play version allows automatic synchronization with the vehicle immobilizer after installation.

Reviews

Number of ratings: 0
Rate and review

  • Mercedes, Fiat, Peugeot & Citroën Transmission Control Module – How to Choose and Repair the Right Gearbox ECU

    Automatic Transmission Control Module – Diagnostics, Common Fault Symptoms and TCM / EGS Repair

    The automatic transmission control module is one of the key electronic components responsible for gear shifting, communication with the engine ECU, and the overall operation of the automatic gearbox. A failure of the TCM, EGS, VGS, ISM or Dualogic module can lead to transmission limp mode, harsh shifting, inability to engage gears, CAN communication faults, “Transmission Fault” warning messages, or even a complete no-start condition.

    In many cases, the issue is related to the transmission electronics rather than a mechanical failure of the gearbox itself. Before considering an expensive transmission rebuild or replacement, it is highly recommended to perform proper diagnostics of the automatic transmission module and verify communication with the TCM or EGS controller.

    On the ECUSALE blog, we publish detailed guides covering the diagnostics, repair and selection of automatic transmission control modules for Mercedes, Fiat, Peugeot and Citroën vehicles. We explain the most common symptoms of faulty TCM and Dualogic units, the differences between VIRGIN, cloning and Plug & Play solutions, and when it is possible to repair the transmission controller without replacing the entire automatic gearbox.

    Read more
  • Faulty Engine Control Unit (ECU) Symptoms – Diagnosis and Repair Solutions

    Symptoms of a Faulty Engine Control Unit – How to Recognize ECU Failure?

    Engine control unit issues are often mistaken for other faults. No start, loss of communication with the ECU, limp mode or reduced engine power can all seem like ECU failure, but in many cases the real cause lies elsewhere – such as electrical wiring problems, injector faults or power supply issues.

    How to Check if Your ECU is Faulty and What to Do Next

    The key is to determine whether the ECU is actually the source of the problem or just reacting to another issue. In this guide, we explain what to look for, the most common causes of ECU failure and when repair is a viable option versus replacing the unit. We also cover the differences between VIRGIN and IMMO OFF solutions and when each approach makes sense.

    Read more