P0157 P1518 codes Please Help

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JohnAndrew

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I've got an 03 Tahoe that started slowing down to limp mode the other day. I took it to a local shop and found out, it was getting the following codes:
P0157 oxygen sensor
P1518 throttle actuator
P0894 transmission components slipping
They determined the transmission fluid was low taking care of the P0894 and that the throttle body needed replacing, which they replaced.
This left me with no error codes.
It drove great for the day.
This evening, while driving, the check engine light came back on and the Tahoe powered back down to limp mode and I limped home.
Any thoughts, anyone, on what I should have them look at?
Any help would be greatly appreciated.
 
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