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Hi can anybody tell me what an air doser is and what does it do

It's a throttle flap that restricts air flow into your inlet manifold to ensure sufficient exhaust gas is recycled during idling, overrun and other periods of light engine loading. It is part of the egr system and works in conjunction with, but not necessarily at exactly the same as the egr valve.

It also has another function where it slams shut on engine shut down to reduce that ~~shudder~~

Later 2.0 HDis didn't get them

thanks for the replies, if it's part of the egr do I need to get rid of it when I get the egr mapped out

It works with the EGR, but if you get rid of/blank off the EGR you may as well lose the doser.

You don't need to, it will just be unplugged from the vacuum system.

You could replace it with the pipework from a 2003/2004 model which bypasses the air-doser for a neater engine bay if you like.

Thanks I'ii see if I can find the pipe work at the local breakers

This shows the alternatives

Helpful thanks