My good friend recently bought a 98 civic hatch thinking he could use it for a commuter. One of the cv's started clunking, so he called me over to help him change it. Sent him to get another axle from NAPA while I looked over the car. Hmm. B16A2 w/ VTEC. Lots of harness connectors not used. Header. Full SS exhaust. Cylinder head is PR3-3 with 99 date stamp. Look farther and find P28 ECU with OBD1-2 adapter. He gets back with the shaft and it is loose in the diff. Me thinks he needs to swap it for a 99si axle and send him back. While he is gone, I open the ECU and find an SST 27SF512 chip. Look more and find S4C trans(non-LSD). He gets back and the 99 axle fits. Got it back together and then he starts asking why the power is down and mileage sucks. That is why I am here. How do I get codes from an OBD1 computer adapted to an OBD2 harness without the two wire(black/brown) connector? I was considering hooking up my Snap-On scanner to the OBD port, but not sure what would happen with the adapter, or happen to my scanner. We did not do this swap, it was already done before he bought it. Now trying to figure out how to make it run right. I think the TPS is bad as he says the throttle is not responsive and will stall sometimes when he hits the gas. PCM: 37820-P28-A52-761-761684 with SST chip and adapter OBD1-2 B16A2 with 99 date stamps S4C trans All in a 98 Civic non-Si. Any help appreciated.