1993 codes 21 and 24 (1 Viewer)

Oct 8, 2007
piermont, NY
Hey guys got these codes when getting on hiway tonite- truck still warming up - got the O2 one months ago w/ some TCM codes reset- never came back-til last nite I haven't fixed the tiny leak btwn one of the sensors and cat. Mileage has been between 10-11 w/ mixed driving- i am really efficient driver and should be seeing at least 13 so iam suspecting O2 - one looks welded in prob both original w/ 120 something on the clock
What is with the IAT 24 code???

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