Ford Focus & Mondeo ECU’s

Focus and Mondeo ECU fault

Ford Focus / Mondeo ECU common misfire fault


This is a very common fault for the 1.4 - 2.0 Ford Focus (Mk I) and Mondeo (Mk II & III). When the ECU fails it causes a constant misfire on two of the cylinders.

This fault is usually caused by a faulty coil pack on the vehicle which in turn damages the internal circuitry of the engine ECU and causes this misfire.

Other, but less common, faults for this engine ECU include non-start or no spark and faults with the charging system.


Once this damage has been done to the ECU the faults will remain permanent, however we offer a complete ECU rebuild to resolve this issue within 1-2 working days and get you back on the road as soon as possible.


Please note:

This common fault of misfire on two cylinders or complete non start is often caused by the ignition coil pack shorting out on the vehicle - it is very important that the ignition coil pack is replaced at the same time as refitting your ECU after it has been repaired - or you faulty coil pack may damage the repaired ECU.


Common Failure symptoms:

  • Misfire on two cylinders
  • Severe misfire
  • No power
  • Complete non start
  • Engine management light


Common fault codes:

  • P0351 - Ignition Coil A Primary / Secondary Circuit Malfunction
  • P0352 - Ignition Coil B Primary / Secondary Circuit Malfunction.


Affected Vehicles:

  • Ford Focus (Mk I) 1998 – 2005
  • Ford Mondeo (Mk II & III) 1996 - 2007


Test and rebuild:

After testing the ECU on our bespoke test rigs, we will rebuild the faulty ECU using higher rated than standard components. We know that once rebuilt your ECU will outlast the vehicle it is put back onto.



We can rebuild your own Ford Focus or Mondeo engine ECU and will be programmed to work as soon as it is plugged back into the vehicle, no need for a trip to the dealer for coding - completely plug and play.



We have rebuilt many of these ECUs for Ford specialists and main dealerships so you can be assured of our very high quality of work and commitment to after sales customer care.



Lifetime unlimited mileage*


Price and product info: If your part number is not in our short list above then please select your vehicle and choose your part number here: Ford Focus ECUs / Mondeo ECUs


*This is the common fault for vehicles built between 1998 – 2007

Please click here to see the common failing ECU for the 2004 – 2011 Focus (Mk II) & Mondeo (MK IV)


How do I get my unit rebuilt?

To pay for the rebuild select your part number or vehicle above and then click: Get yours rebuilt

Print the payment/booking confirmation email.

Package the Ford Focus/Mondeo engine ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received we will test, rebuild and return your Focus/Mondeo ECU with an unlimited mileage lifetime warranty. (if your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping)


What if I don’t want to pay up front?

This is not a problem, if you prefer this option then follow the following steps:

Fill in and submit this test form.

Print the booking confirmation email.

Package the Focus/Mondeo ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received, we will test your engine ECU and call you to advise on the outcome of testing, if your ECU is faulty and you choose to go ahead with the rebuild then we will take payment over the phone using a debit/credit card.

We will then rebuild your engine ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this Ford Focus/Mondeo engine ECU then please contact us.

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Comments on "Ford Focus & Mondeo ECU’s"
Friday Solomon says: 10/3/2020 9:03:49 PM
My Ford Mondeo can not start and went you start the car will off and the motor repair said it is brain box is cause we buy the brain box the car did not start what will I do now
ECU Admin says: 13/3/2020 10:01:45 AM
Hi Friday Solomon, we can help you with your ECU. This ECU will commonly prevent the vehicle from starting when it becomes faulty. To begin select your part number from the following list:
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