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I have a 99 convertable with auto. I got a "check" light and ran the onboard diagnostic check and discovered two DTC's; 1) 58SDM B1001H 2) 10PCM P0440HC
I cleared them once and they returned within 200mi. or so. She runs just as well either way but the last thing I want to do is cause a possible problem to get worse. Could somebody clue me in on thier meaning and, more importantly, what maintenance actions would be necessary to repair this.
S.T.W. Stock