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Old 06-07-2003, 06:32 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
Code 4 is AIR system and 5 is EGR system..
Because BOTH these systems Switch -Over- Valves are supplied engine vac from a Common intake vac line ,
I would check that line for cracks/broken/disconnect...
If this singe vac line is broken, Both systems will not operate and they will Both throw a CE lamp/code...
There can be many other causes, but start there first due to both codes coming up at the same time... and it is common to see this line broken from heat fatique...

Last edited by Arthur Dalton; 06-07-2003 at 06:41 PM.
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