After Engine Swap Downstream O2 Sensor Question

[tmontague]

Yes, I have the whole yaris part, sensor, wire and all.

What's the code being thrown, P0420?

[06YarisRS]

Originally Posted by tmontague

Yes, I have the whole yaris part, sensor, wire and all.

What's the code being thrown, P0420?

Actually, I'm getting P0138 and P0607 (ECU) but from my reading that's not uncommon with the failing o2 sensor messing with the ecu. I'm going to remove the sensor, check the wiring and use a multimeter to check if the sensor is good. It was like $16.00 or something off ebay. The fault is very intermittent, I haven't seen it in 7 - 8 starts and runs, but it appeared a couple of days ago, again.