RXP exhaust temp sensor. Showing check engine light,code P546&P1511. Changed sensor no difference,

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Wjw

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Changed sensor, no change with codes, checked sensor with ohm meter, got 2.5 reading. Check voltage at connector , 5volts, the other terminal has continuity to ground. Every thing seem to check out ok but still have check engine codes and sensor fault showing on dash.Disconnected the battery to try to reset it but didn’t work either. Any got a suggestion?
 
Plugged water filter in the pump, look up the part up top and take out the filter and clean it. The code will clear after it runs for a few minutes without a problem.
 
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