NLXTACY
Wits' End
Unfortunately this is going to be one of a my few threads that is NOT photo intensive and that is just because I ran out of time before leaving town and I wasn't thinking about photos at the time. So...sorry 
Here is the deal: 93-94 oxygen sensors from Toyota are now NLA and I'm sure by now the last set have been snapped up. But 95-97 oxygen sensors are still aplenty. In fact I carry the Denso on the site:
wits-end.mybigcommerce.com
wits-end.mybigcommerce.com
After a lengthy conversation with a customer it was decided to have him make the attempt to convert the 95-97 sensors to be used on the 93-94 trucks. For those not familiar, the 95-97 (OBD2) setup is upstream and downstream (inline) whereas 93-94 (OBD1) are left and right banks.
After going thru the EWD for both the 97 and 94 trucks it seems there was a path forward to convert the sensors. Again, my apologies for not having photos. Maybe someone else will add photos after doing this themselves. But simply put the only thing different between the sensors is the wire colors and connector. The physical sensor is the same for up vs down and right vs left. So all that needed to be done was figure out the wiring and swap the connector.
So one by one you remove the old 93-94 sensor, use VERY skinny terminal pin tool to remove the pins from the connector. You will NEED the connector. If your connector is melted or broken...my condolences. Now remove the connector on the new 95-97 sensor (with the pigtail length that matches best) and ALSO remove its connector. Re-pin according to the drawing below and then BE SURE to use the OLD connector on the NEW sensor. Rinse and repeat with the remaining sensor. After more than a month now and a few hundred miles, the truck is running awesome, picked up some increased mpg (don't expect a lot) and no more CEL.
Here is the deal: 93-94 oxygen sensors from Toyota are now NLA and I'm sure by now the last set have been snapped up. But 95-97 oxygen sensors are still aplenty. In fact I carry the Denso on the site:
80 Series Denso Oxygen Sensor- Front, Short Pigtail
80 Series Denso Oxygen Sensor- Front, Short Pigtail (DOS-2)
80 Series Denso Oxygen Sensor- Rear, Long Pigtail
80 Series Denso Oxygen Sensor- Rear, Long Pigtail (DOS-1)
After a lengthy conversation with a customer it was decided to have him make the attempt to convert the 95-97 sensors to be used on the 93-94 trucks. For those not familiar, the 95-97 (OBD2) setup is upstream and downstream (inline) whereas 93-94 (OBD1) are left and right banks.
After going thru the EWD for both the 97 and 94 trucks it seems there was a path forward to convert the sensors. Again, my apologies for not having photos. Maybe someone else will add photos after doing this themselves. But simply put the only thing different between the sensors is the wire colors and connector. The physical sensor is the same for up vs down and right vs left. So all that needed to be done was figure out the wiring and swap the connector.
So one by one you remove the old 93-94 sensor, use VERY skinny terminal pin tool to remove the pins from the connector. You will NEED the connector. If your connector is melted or broken...my condolences. Now remove the connector on the new 95-97 sensor (with the pigtail length that matches best) and ALSO remove its connector. Re-pin according to the drawing below and then BE SURE to use the OLD connector on the NEW sensor. Rinse and repeat with the remaining sensor. After more than a month now and a few hundred miles, the truck is running awesome, picked up some increased mpg (don't expect a lot) and no more CEL.
How about providing the harness side plug part numbers? Then folks can just swap them out and not worry about retaining the old plugs.
