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After replacing the secondary O2 sensor (not very difficult) and taking a few short drives over 3 days, no CEL. Then I drove it to work yesterday, intending to go get a smog certification in the afternoon. Unfortunately the CEL came back on. D'oh! But the good news is it's unrelated to the O2 sensor, it's just the P0446 EVAP code I have gotten once in a rare while. So I think the O2 sensor was indeed bad, and therefore suspect that "Throttle position sensor 1" is an incorrect label for P1121.
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