190 is fuel rail pressure sensor. 340 is camshaft position sensor.190 will come up if you unplug frp sensor with ignition on. There may not be a problem but you'll need to clear them to see if they return. I us an OBDII bluetooth unit with my phone and an app called "JeepDiag". Hope this helps.
Someone else maybe able to tell you if there is another way to clear them.
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03 WG grand CRD Overland. (written off)
05 KJ cherokee crd extreem sport (current)
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