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Discussion Starter · #1 ·
"Service Engine Soon" light came on two days ago. 2001 Disco II with 88,500 miles, serviced two months ago. OBD'd it last night and the following codes were pulled:

P0133 (Oxygen sensor slow response A upstream)

P1412 (secondary air system bank 1)

P0420 (catalyst efficiency low bank A)

P1415 (secondary air system fault bank 2)

Any tips on what this might involve? Thanks!
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