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Secondary air injection system fault

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Old Aug 10, 2021 | 03:59 AM
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2009 E250 CGI
Secondary air injection system fault
Hi all,

I got a P0491 CHeck engine code, which means “ Secondary air injection system insufficient flow bank 1”. On my 2009 E250 cgi coupe.
does anybody know where the injection pump is located, or had any experience fixing this before

thanks

adam

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Old Aug 17, 2021 | 02:14 PM
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E400 W207 C320 W203
Assuming you have the M272 engine.
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