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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,849 Posts
Maybe what was leaking engine oil (the filter?) let go completely and sprayed oil onto the hot exhaust? What brand oil filter do you use? Is it being overtightened? Stuck pressure relief valve?
The O2 heater failure codes, especially upstream and downstream together at the same time make me think that it isn't the O2 sensors themselves. It would be very unusual for both heaters to fail at once.
 
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