1997 Toyota Estima SC O2 sensor

[DeathRex]

I needed to replace my catalytic converter (melted a hole in it), I found a CARB compliant cat on rockauto and the upstream and downstream O2 sensors. Unfortunately my downstream sensor is 2 wire, where the previa is a 4 wire. Anyone know where I could get a 2 wire sensor for a 2TZ-FZE engine.

[13ozLatte]

It looks like 95 and older use a 2 wire, probably the difference is obd2 vs obd1.

[bjk]

I noticed the same on my '95 Estima. A mechanic told me the downstream is only used to light the cat overheat indicator on the dash when the temperature exceeds a certain amount and doesn't interact with the ECU at all. I've yet to find the replacement but he also mentioned it is $300. So I just live with what I have an watch the dash light turn on after acceleration then turn off after a couple seconds.