BMW 1 Series (F20/21) 116i & 118i engine ECU fault - causing engine misfire

This engine ECU is a very common failure for the BMW 116 & 118 Sport/M Sport built from 2011 onward. When the ECU fails it will cause the engine to lose power and misfire on one or more cylinders, with fault codes stored for cylinder misfires and/or injector shutdown. To diagnose a failed ECU check the primary ignition signal supplied to the ignition coil with an oscilloscope, the signal will be weak or not present if the ECU has failed.

BMW 116 engine ECU
The root-cause of the failure is normally due to a faulty ignition coil going short circuit and drawing excessive current through the ECU, this in turn overloads the ignition coil activation circuits within the ECU. Replacing the ignition coil alone will not cure the problem and the shorted-out ECU may even overload the new coil, causing a vicious cycle of Coil-ECU-Coil damage. It is always best to check for an ignition primary signal to the coil before replacing it, if there is no primary output signal from the ECU then it can be assumed the ECU is damaged, in this instance the ECU fault should be rectified BEFORE fitting a replacement coil to avoid damaging the new coil with a faulty ECU. If in doubt it is always best to replace the ignition coil with a new one when refitting the rebuilt ECU if you suspect the coil could have been fitted when the ECU was faulty.

We can rebuild your own BMW 1 Series ECU with an unlimited mileage lifetime warranty* for a small fraction of the cost of a new unit. You only get a one-year warranty from the manufacturer when you buy a new ECU so you really are getting the best of both worlds - a cheaper alternative to a new ECU with a much longer warranty to boot. 


Common Failure symptoms:

  • Engine misfiring constantly
  • Loss of power 

Common fault codes:

  • 140001 - Misfire several cylinders fuel injection is switched off
  • 140010 – misfire multiple cylinders detected
  • 140101 - Misfire cylinder 1 injection shut down
  • 140110 – Misfire cylinder 1
  • 140201 - Misfire cylinder 2 fuel injection is switched off
  • 104210 – Misfire cylinder 2 detected
  • 150102 - Ignition cylinder 1 combustion time too short
  • 150202 – Ignition cylinder 2


Affected Vehicles:

  • BMW 116i/Sport/M Sport 2011 - 2015
  • BMW 118i/Sport/M Sport 2011 – 2015
  • BMW 114i Sport 2011 - 2015


Test and rebuild:

We fully test every ECU before and after the rebuild using our HIL (Hardware In-the-Loop) vehicle simulators, these simulators allow us to test your ECU under all real-world load conditions. This ensures that your ECU meets or exceeds the OEM specifications. We replace all common failing components with versions that are higher rated than standard, so you can be assured that once your ECU has been rebuilt it will perform as good as, if not better than a brand new unit.


There is no need for any programming once you receive your rebuilt ECU, just plug in and away you go. 


Our ECU test and rebuild services are used by Franchise main dealers and specialist workshops all over the globe, so you can be assured of our very high standard of work.


Lifetime unlimited mileage*


Common failing part numbers:

0261S07783 / 7636292-01 / 030058028DME

0261S09472 / 030207508DME

0261S09219 / 8 610 484 -01 / 030178254DME 

0261S07665 / 7634297DME

0261S08333 / 7640755DME

0261S10397 / 8630125DME

0261S09073 / 8605989DME

0261S09330 / 8611786DME

0261S11037 / 8638198-01 / 030343265DME

(this is a list of common failing part numbers related to this fault, if you do not see yours then you can see the full range of BMW 1 Series ECU part numbers)


How do I get my unit rebuilt?

1. Click on your part number from the list above and then click ‘Get Yours Rebuilt’ to pay.
2. Print the payment/booking confirmation email.
3. Package the ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).
4. Send us your package by tracked courier (the shipping instructions are on the confirmation email).
Once received we will test, rebuild and return your 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:

1. Fill in and submit this test form.
2. Print the booking confirmation email.
3. Package the ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).
4. Send us your package by tracked courier (the shipping instructions are on the confirmation email).
5. Once received, we will test your 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 ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this BMW 1 Series ECU then please contact us.

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