I had sudden heater errors on all my O2 sensors.
Took it to a shop, ordered replacements, and they could not get the heater to work properly, so they said it would affect my startup fuel consumption. My Jeep has all sorts of electrical gremlins from the PO that keep popping up as if they were scheduled beforehand.
We ordered Mopar replacements from the US - they got here fairly quickly and weren't too expensive at all.
Not sure how it affects mileage, but I am beginning to get used to the codes at least.
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It woulda been cheaper to set a year's salary on fire in the driveway & just left seat with friends
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