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AllData -code 035 e320-124 chassis 104 eng HFM-SHI

O2 sensor system operating at rich limit, mix too lean

Remedy/Causes:

Intake air leak
Fuel injectors
Reg pressure diaphram

BC you also see an AIR code fault, I would look at the vac hose
that goes from the engine intake , front of engine [ white plastic hose under front engine cover ] to the AIR/EGR Switch over valves... on 104s , these dry out and break, causing an air intake leak [ causing the lean condition] and that will bring up the AIR and/or EGR codes along w/19 ..just a possible, but common 104 problem....
Post what you find at pin 8 on HFM-SFI module...that will help
I don't think HFM-SFI computer had the problem of the LH-SFI