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Q: check engine code reads Catalytic running too cold and engine running too cold. on 2005 Nissan Sentra

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my mechanic says it might be that since the thermostat may be stuck in open position, the catalytic converter may not be registering hot enough to work effectively. Is this possible??
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90% it's a stuck open thermostat. Have the mechanic plug in the scanner and see what the coolant temperature is getting up to. Should be above 190 degrees while driving.