Used 2012-2013 Mercedes W221 S550 ECM Engine Control Module Unit 278-900-10-00 O

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Used 2012-2013 Mercedes W221 S550 ECM Engine Control Module Unit 278-900-10-00 O

Name: Used 2012-2013 Mercedes W221 S550 ECM Engine Control Module Unit 278-900-10-00 O
Brand: Mercedes-Benz
SKU: 2027-0503
Price: 393.75 USD
Availability: InStock

Fits / from: Mercedes-Benz S-Class 2011 Stock no.: 2027-0503 Category: Engine Control Module Manufacturer part no. (MPN): A-278-900-10-00, A2789001000, A 278 900 10 00, 278-900-10-00, 2789001000, 278 900 10 00 Condition: Used — OEM

$393.75

Free shipping · free local pickup

In stock

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✅ Genuine OEM — removed from a real vehicle in our US yard
✅ The photo is the exact part you receive
✅ Fitment-checked · free 30-day returns
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About this part

Genuine used OEM 2012-2013 Mercedes W221 S550 ECM Engine Control Module Unit 278-900-10-00 O. Removed from a Mercedes-Benz S-Class 2011. Manufacturer part number (MPN): A-278-900-10-00 , A2789001000 , A 278 900 10 00 , 278-900-10-00 , 2789001000 , 278 900 10 00. In stock at our US warehouse, photographed as the actual item you receive, and fitment-checked.

Not sure it fits your car? Send us a quick request — our team confirms fitment, availability and price fast.

Specifications

Category	Engine Control Module
Fits / from	Mercedes-Benz S-Class 2011
MPN	A-278-900-10-00, A2789001000, A 278 900 10 00, 278-900-10-00, 2789001000, 278 900 10 00
Stock number	2027-0503
Condition	Used — OEM, tested
Availability	In stock

Fits these vehicles

This genuine used OEM part is confirmed to fit 82 vehicle configurations across the makes and models below — it was removed from a Mercedes-Benz S-Class 2011. Don’t see your exact car? Send a quick request and we’ll confirm fitment before you buy.

Vehicle	Years	Engine
Mercedes-Benz CL550	2011–2014	4.7L
Mercedes-Benz CL63 AMG	2011–2014	5.5L, 6.0L, 6.3L
Mercedes-Benz CLS550	2012–2018	4.7L
Mercedes-Benz CLS63 AMG	2012–2014	5.5L
Mercedes-Benz CLS63 AMG S	2014–2016	5.5L
Mercedes-Benz E550	2012–2017	4.7L
Mercedes-Benz E63 AMG	2012–2015	5.5L
Mercedes-Benz E63 AMG S	2014–2015	5.5L
Mercedes-Benz S350	2012–2013	3.0L, 3.5L
Mercedes-Benz S550	2012–2013	4.7L
Mercedes-Benz S600	2013	5.5L
Mercedes-Benz S63 AMG	2011–2013	5.5L, 6.0L, 6.2L, 6.3L
Mercedes-Benz S65 AMG	2013	6.0L

Questions & answers

Will this part fit my Mercedes-Benz S-Class?

It was removed from a Mercedes-Benz S-Class 2011 and fits that vehicle and compatible Mercedes-Benz S-Class variants. Not sure? Send a quick request with your car details — our team confirms fitment before you buy.

Is this a genuine OEM part?

Yes — an original manufacturer (OEM) part removed from a real vehicle in our US yard, not an aftermarket copy.

What condition is it in?

Used and tested. The photos on this page are the exact item you receive — no stock photos.

How do I order — there is no online checkout?

Send a request with your name and phone. Our team confirms availability and price and helps you complete the purchase and shipping. Free 30-day returns.

Do you ship, or can I pick it up?

Free local pickup at our New Jersey yard, and we ship across the USA. Worldwide shipping is available on request.