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2014 mercruiser serial # 2a191194 dtc 321 & 322

S

stang32

Regular Contributor
hi all, i have this boat that is throwing 2 hard codes, 321 & 322 which refer to the O2 system. ive erased them and they come back within and hours time running. the boat goes into closed loop and the sensors are dancing but i can't find info on what their perameters should be and i can't find much info on line about this issue and wondering if i can get some help.
 
Connect a DIGITAL voltmeter set on 10 VDC to the O2 sensors and see what the voltage is doing. If it is working the voltage range of the sensor can be determined Compare both sensor's voltages. Large voltage jumps indicates a defective sensor.
 
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