GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Code 2257

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Old 07-10-2024, 08:20 AM
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GL450
Code 2257

Hi All- I'm troubleshooting this code, and rapidly reaching wit's end. I've replaced the pump itself, the bank A check valve and the switchover to no avail. I think I have replaced the relay for the pump, but there are multiple opinions as to which is the correct part. Am I missing somethink obvious? I recently found reference to an air injection valve, but dont't know what this is or where to find it. Any suggestions appreciated.
Old 07-10-2024, 01:13 PM
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1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
secondary air

107 fuse & E relay.
Old 07-10-2024, 01:42 PM
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Thanks, I'll have a look at that today. Is there a spec or part number on the relay?
Old 07-10-2024, 03:38 PM
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1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
relay

Originally Posted by sgidd17
Thanks, I'll have a look at that today. Is there a spec or part number on the relay?
You will see the part number on the relay.. any questions take a picture of your fuse/relay box and post it.
Old 07-10-2024, 11:17 PM
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Now just one GL450 with EORP.
Are you using a generic code scanner?

Do you have a check engine light that corresponds to secondary air injection?

Do you hear the pump operating at cold starts?


MB star with developer mode gives you the ability to just code that stuff out as it does really nothing for you anyway.

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