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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.
P0404 Exhaust Gas Recirculation Circuit Range/Performance
Exhaust Gas Recirculation Sensor "A" Circuit High. Replace Sensor The sensor is part of the egr valve. Replace the valve.
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.
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Trouble code P0403 means: Exhaust Gas Recirculation Control Circuit Replace the EGR valve