Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Remove/Install Powertrain Control Unit - AR07.08-P-0002MFE
Engine 139, 260, 282, 608, 654 in model 118, 177, 247
Shown on model 177
| Topical note | Information on preventing damage to electronic components due to electrostatic discharge | AH54.00-P-0001-01A | |
| Notes on safety-relevant components | AH00.00-Z-0019-01A | ||
| Remove/install | |||
| 1 | Perform commissioning of the powertrain control unit (N127). | If the powertrain control unit (N127) is being replaced. | |
| AD00.00-P-2000-06MFA | |||
| 2 | Release front left floor covering from center console and fold back until the powertrain control unit (N127) is accessible. | ||
| 3 | Release and disconnect electrical connectors from powertrain control unit (N127). | ||
| 4 | Release powertrain control unit (N127) from the locks (arrows A) and remove from the bracket. | ||
| 5 | Install in the reverse order | ||
| 6 | Connect vehicle diagnosis system, read out fault memory and clear if necessary. | ||
| AD00.00-P-2000-06MFA | |||
| Check | |||
| Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | AS00.00-Z-0005-01A | |
| Risk of burn injuries , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust. | Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area. | AS49.00-Z-0001-01A | |
| 7 | Conduct engine test run while checking for proper operation of the engine. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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