It's a 2009 Rav4, 2.5L with a P0137 code reading. I'm hoping to replace the O2 sensor myself, but haven't been able to locate the B1S2 sensor on the vehicle. Most of the videos, threads here, and diagrams I've seen seem to show a 3.5L engine. Originally bought the Denso 234-4501, but that didn't fit. Please advise and thank you!