Engine Code #1 and #13

I keep getting these to codes on my Integ #1 is the oxygen sensor and I believe it just gets tripped when the car is at normal operating temp since the A/F ratio is measured. But why would #13 Barometric pressure get tripped is it since the turbo is feeding the engine more compressed air. It didn’t explain #13 in the book it just said to take it to a dealer.

How do you delete the codes from a 91 Integra LS ecu I tried the fuse like it said in the repair manual but it didn’t work

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