please give me an answer

[BUSHWHACKER]

They reduce NOX emmisions by re-introducing exhaust gasses back into the engine to be re-burnt.
NOX emmisions are not tested for (yet) in the UK, but by disconnecting them less smoke (usually) is produced and a bit more throttle response (marginally) can be gained.
I disconnected mine when my truck was a 2.4, and completely deleted it on the V-8.

[steve s]

ok ill do it to mine see what happens.is there any reason for my isuzu having two ?

[BUSHWHACKER]

ok ill do it to mine see what happens.is there any reason for my isuzu having two ?

No idea. Could be just two smaller ones instead of one big one.

[MattF]

is there any reason for my isuzu having two ?

Asking the question on an Isuzu forum might be an idea.

[BUSHWHACKER]

Asking the question on an Isuzu forum might be an idea.

Or here...
http://lmgtfy.com/?q=Why+has+my+Isuzu+got+two+EGRs%3F

[MattF]

Or here...
http://lmgtfy.com/?q=Why+has+my+Isuzu+got+two+EGRs%3F

[biosurf]

Or here...
http://lmgtfy.com/?q=Why+has+my+Isuzu+got+two+EGRs%3F