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2013 mxz trouble code spn 66020 and 66019


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hey guys was out this weekend boat just hit 145 hrs then red alert saying need service pops up clear it comes  found to active codes spn  66020 and 66019 cant find out what these are boat runs fine

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Bad gas seems unlikely since the codes relate to the O2 sensor heaters.  More likely a wiring issue

What were the FMI numbers after the SPN numbers?  That gives you a more exact error code

Have a look at this PDF - they are the pages from the MEFI manual that have the troubleshooting directions.  Most of them require diacom, but some are more conventional tests

 

O2 codes.pdf

Edited by oldjeep
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