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M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

ML320 CDi rear Sam

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Old Apr 30, 2026 | 09:27 AM
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From: Dudley
Mercedes S350
ML320 CDi rear Sam
Sorry if this has been done before.

Recently acquired a neglected ML320CDI sport 2009.

Rear Sam common failure symptoms on dash. And have seen corrosion on unit. However part number A164 540 05 01 is or does seem to be linked to the 280 model.

I suspect someone has replaced the unit but got the wrong one.

I need to find the correct part number for my car. Does anyone know or can access. The Electronic Parts Catalogue and help me or provide a link?

Also would software currently on car be same or would I need specialist to do corrections to a new Sam when coding new part.

Vin is WDCBB22E57A252901
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Old Apr 30, 2026 | 11:33 AM
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W213 All-terrain
Originally Posted by tvor
Sorry if this has been done before.

Recently acquired a neglected ML320CDI sport 2009.

Rear Sam common failure symptoms on dash. And have seen corrosion on unit. However part number A164 540 05 01 is or does seem to be linked to the 280 model.

I suspect someone has replaced the unit but got the wrong one.

I need to find the correct part number for my car. Does anyone know or can access. The Electronic Parts Catalogue and help me or provide a link?

Also would software currently on car be same or would I need specialist to do corrections to a new Sam when coding new part.

Vin is WDCBB22E57A252901
Your SAM has the right reference number,


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Old Apr 30, 2026 | 12:33 PM
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From: Dudley
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So the ML280cdi can be used on the ML320 cdi? My understanding was it is vehicle or model specific? I genuinely dont know. So would be grateful for any pointers with this.
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Old Apr 30, 2026 | 02:21 PM
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W221 S500
As long as it's from the same production ie pre or post facelift and coded with the correct options, it's perfectly fine.

The options can be switched on/off using DAS/Xentry😉
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Old Apr 30, 2026 | 02:43 PM
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From: Dudley
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Thank you. Slightly relieved still have to replace it though
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Old Apr 30, 2026 | 03:14 PM
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Originally Posted by tvor
So the ML280cdi can be used on the ML320 cdi? My understanding was it is vehicle or model specific? I genuinely dont know. So would be grateful for any pointers with this.

Picture from #2 is from Electronic Parts Catalogue. Numbers are in .... English.
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