BMW 1 Series (F20/21) 116i & 118i Engine ECU Fault

Frequent ECU failure is a common issue in BMW 116 and 118 Sport/M Sport models manufactured from 2011 onward. This malfunction leads to engine power loss and misfires on one or more cylinders, with corresponding fault codes indicating cylinder misfires or injector shutdown. To diagnose a faulty ECU, it is recommended to check the primary ignition signal supplied to the ignition coil using an oscilloscope. A weak or absent signal typically signals ECU failure.

The root cause often stems from a defective ignition coil going short circuit, drawing excessive current through the ECU. This overloads the ignition coil activation circuits within the ECU. Simply replacing the ignition coil may not resolve the problem, and a new coil could be damaged by the faulty ECU. Therefore, it’s crucial to check for an ignition primary signal before replacing the coil. If there’s no primary output signal from the ECU, it can be assumed that the ECU is damaged. In such cases, addressing the ECU fault before fitting a replacement coil is advisable to prevent potential damage to the new coil.

Rebuilding your own BMW 1 Series ECU is offered with an unlimited mileage lifetime warranty, providing a cost-effective alternative to purchasing a new unit. Unlike the one-year warranty from the manufacturer for new ECUs, this option gives you a longer warranty period. The rebuilding process typically takes 2-3 working days.

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Common Failure Symptoms

• Constant engine misfiring
• 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

Commonly Failing Part Numbers

• 0261S07783 / 763629201
• 0261S09472 / 030207508DME
• 0261S09219 / 030178254DME
• 0261S07665 / 7634297DME
• 0261S08333 / 7640755DME
• 0261S10397 / 8630125DME
• 0261S09073 / 8605989DME
• 0261S09330 / 8611786DME
• 0261S11037 / 030343265DME

Affected Vehicles

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

Test and Rebuild

• Every ECU undergoes comprehensive testing before and after the rebuild using HIL (Hardware In-the-Loop) vehicle simulators. These simulators ensure testing under real-world load conditions, meeting or exceeding OEM specifications. Common failing components are replaced with higher-rated versions to guarantee optimal performance.

Programming

• No additional programming is required upon receiving the rebuilt ECU. Simply plug it in, and you’re ready to go.

Quality

• The ECU test and rebuild services are trusted by franchise main dealers and specialist workshops globally, ensuring a high standard of work.

Warranty

• Lifetime unlimited mileage warranty.

1. Select your part number.
2. Click “Get your repair.”
3. Print the payment/booking confirmation email.
4. Package the BMW 1 Series ECU securely with the confirmation email.
5. Send the package via tracked courier.

Who prefer not to pay upfront?

1. Fill and submit the repair form.
2. Print the booking confirmation email.
3. Package the BMW 1 Series engine ECU securely with the confirmation email.
4. Send the package via tracked courier.
5. After testing, we will contact you with the outcome. If the ECU is faulty and you choose to proceed with the rebuild, payment can be made over the phone using a debit/credit card. The rebuilt ECU will be returned with an unlimited mileage warranty.

For further information, contact us.

Contact AUTOTRONICS at 0116 276 7054 or email us at [email protected] for expert assistance. Our experienced engineers are here to solve all your queries and provide top-notch services.

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