No.... it's most definately not an O2 sensor...
It could be that the front band is out of adjustment, and letting the front
drum slip under higher engine power. It could be a faulty TPS sensor,
thinking you're at WOT, and letting the engine wind out in 1st. It could be
a mis-adjusted (too-tight) TV cable, delaying the upshift because of higher
Check the band and TV cable adjustments first, because they're mechanical
and easy to check. If that doesn't do it, back-probe the TPS with a
multi-meter (analog preferred), and check the output voltage in reference to
the throttle position - see if it's incorrectly reading WOT at a partial
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