Moxie has a new upstream O2 sensor.
The old one failed at 140k miles.
Not bad.
Turns out to have been very simple compared to a couple of O2's I'd done before.
Remove all the plastic shit off the top of the motor, reach over the top to the sensor's location on the exhaust manifold.
I didn't even have to crawl in the dirt!
I am happy that I got an O2 sensor socket years ago, because there's no getting a normal wrench in where it lives.
After the test drive: Closed Loop on bad O2 < Open Loop < Closed Loop on good O2.
Instant mileage is better than the last time I looked too!
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