Mitsubishi Repair & Maintenance Questions? Ask a Mechanic Online
If this fault comes back on just with switching on the ignition then you have a problem with the EGR being stuck open/closed .try another EGR valve , but first check the wiring harness for any shorts to ground ..as a short will also give you this code .
Wiring harness good replace the EGR valve .
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Soot in the coolant water .is a sign of a headgasket issue .
Do a Co2 test to confirm a bad head gasket .
Then please get back to me .