If the online parts information is correct, the 2002 Express Van 5.7 liter (Vin R) uses AC Delco part # AFS105 for the upstream (before catalytic converter) Heated O2 Sensors (HO2S). I would use the AFS105 HO2S for a TPI system controlled by the 12200411 PCM. I'm sure aftermarket brands can be cross referenced to the AFS105 part number. I'm sure the aftermarket HO2S are competitively priced compared to the AFS105 pricing. The 12200411 uses 4 HO2S 1 upstream, 1 downstream on each side of the engine to make a total of 4 HO2S. The two downstream HO2S can be eliminated with custom PCM Flash Programming.


The MAF is optional with the 12200411 PCM, but custom Flash Programming is required. The 2002 Express Van 5.7 liter (VIN R) used a 3 Wire MAF Sensor. The LS 5.3 liter MAF Sensor is 5 wire, a segment swap of the 5.3 liter MAF Parameters will need to be done for the 1200411 PCM Flash Programming.

dave w