Yes you can clean the MAF sensor, you will need a tamper resistant Torx bit (T-10) see picture below.
You can try swapping the O2 sensors but that might not tell you much, I would expect the same alarm after swapping.
Catalytic converters are very expensive and rarely are they the issue. Normally it’s a problem upstream (sensors, vacuum leaks).
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Jäger
300K Mile Club
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