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Q: P1529/P0720 Error Codes Generated: What should I do? on 2002 Hyundai Sonata

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I was cruising at 65 mph set on cruise control after only ten minutes when all of a sudden, it felt like my front end dropped and I noticed that the RPMs were running in 3rd gear. My gear slipped. Since I was on a bridge, I slowed down to 55 and pulled off immediately.

I turned off the car then turned it back on. No problems all the way back home (1 hour drive freeway)

This morning, after driving on the freeway for about 45 minutes, the gear slipped again when I was going about 55 mph with the RPMs revving in 3rd gear.

I am taking my car for an automatic transmission flush this afternoon but was wondering about the P-error codes. I noticed it said output but should I also replace the input speed sensor as well?

No smoke expelled, no burning smell, no loss of power before the gear slipping, and no clunking noises.

Thanks so much!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The P0720 code indicates the output speed sensor. I will purchase it and replace and see if that alleviates the issue. Thank you.
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