its a exhausts gas regulator Exhaust gas recirculation valve. You usually need to replace it.
P0400....Exhaust Gas Recirculation Flow P0401....Exhaust Gas Recirculation Flow Insufficient Detected I can't find any that has a .1
EGR- Exhaust gas recirculation. Go to a local shop and get it checked out.
Right above oil filter under exhaust
The circuit range should be between 3.4 and 4.5. Anything above 5 or below 3 is not performing correctly.
The exhaust diagram for a Dodge Caravan can be found by doing an internet search. An internet search will return various diagrams of the same.
Exhaust Gas Recirculation Sensor "A" Circuit High. Replace Sensor The sensor is part of the egr valve. Replace the valve.
P0404 Exhaust Gas Recirculation Circuit Range/Performance
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Trouble code P0403 means: Exhaust Gas Recirculation Control Circuit Replace the EGR valve