Check Engine Light on 1992 Land Cruiser indicating Oxygen Sensor Issue (code 21); what now?

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Just to update everyone:

I noticed a hole in the exhaust pipe right next to the left side oxygen sensor. I was thinking this might be the reason why the check engine light came on in the first place (too much oxygen sensed perhaps). I went ahead and scrubbed it down with a steel brush then put some liquid steel on it. I then pulled the EFI fuse to recet the ECU. So far so good. No check engine light returned for basic city driving.

A nice $10 repair. I wish every repair went like this :P

Here's crossing my fingers. Thanks for everyone's help. You guys are all amazing!
 
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