My Rav4 check engine light came on and I ran the code.. reported multiple O2 SENSOR heater circuit malfunction bank 1 sensor 2
So, I bought a replacement at my Toyota dealer for $250 bucks, popped it in and reset the check engine light ... life was good.
1 day later, check engine is back on the the same code is back ???
Did I replace the right one?? It's the driver side of the exhault manifold rigth in the front of the engine. 4 wire sensor.. sure seems like the right one..
I check everything again, I got 12v on the heater side of the plug.. reset and the drove it day and the light back on..