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No..I am just guessing........

Have you read any of my tutorials and postings on 124.032/124 chassis HFM/SFI Engine Maagement Sytem Dagnostics ??????

Are you aware of the inter-ralationship of an O2 sesnsor code 2 and a code 4 AIR system code on a 124.032 chassis ????
A very common diagnostic combo, I may add...............

Your code 26 is upshift delay and another common HFM/SFI code.

Let me assure you I am SURE ...........

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A Dalton