I changed my air filter today and the old filter had a grey spongy section (1 cm thick) attached to the bottom of the yellow fins . this seemed to operate as an extra layer or filter? However , the new filter I ordered had no such grey filter. Is the grey bit an optional extra or is it vital?
I couldn't understand why the replacement did not have this .
Air filter question - 406 hdi 90 2003 plate
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Re: Air filter question - 406 hdi 90 2003 plate
HI & welcome aboard Phillipe.
I think both versions of air filter element are common, I would not worry about it as either style will prevent unwanted debris being digested by the engine.
I think both versions of air filter element are common, I would not worry about it as either style will prevent unwanted debris being digested by the engine.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
Re: Air filter question - 406 hdi 90 2003 plate
My previous air filter had the grey spongy section, the current does not. There is no difference.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms
2001 Citroen Saxo 1.6i 8v 100
Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue
PP2000 user, can help with faults / diagnostics in the Netherlands.
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms
2001 Citroen Saxo 1.6i 8v 100
Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue
PP2000 user, can help with faults / diagnostics in the Netherlands.
Re: Air filter question - 406 hdi 90 2003 plate
It does sound like the grey spongy bit performs no actual function then ? It's a bit of a funny one because it makes you wonder why they bother with it then if it makes no difference?
Re: Air filter question - 406 hdi 90 2003 plate
Maybe there is a difference (in life span) when driving in dusty conditions.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms
2001 Citroen Saxo 1.6i 8v 100
Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue
PP2000 user, can help with faults / diagnostics in the Netherlands.
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 690.000 kms
2001 Citroen Saxo 1.6i 8v 100
Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue
PP2000 user, can help with faults / diagnostics in the Netherlands.