Upstream O2 oxygen sensor, 2006 Tundra 4.7L V8
 

Hello everyone,

Recently the check engine light turned on in my 2006 Tundra 4.7L V8, and I noticed my fuel economy seemed to be suffering.

I used my ELM327 Bluetooth dongle to read the codes:

Current fault
P0051 - Powertrain - HO2S Heater Control Circuit Low (Bank 2 Sensor 1)

Pending fault
P2197 - Powertrain - O2 Sensor Signal Stuck Lean (Bank 2 Sensor 1)

It seems to be a dead upstream O2 sensor. My mechanic quoted $280 for the sensor, plus labour. This seems like a lot of cash so I started looking into doing it myself.

I located the following parts from Denso:

DENSO 234-9051 Air-Fuel Ratio Sensor (around $110-120 on eBay)
DENSO 234-4260 Oxygen Sensor (around $50-60 on eBay)

Trouble is, I can't get solid info on which is the appropriate one for the upstream sensor.

Could someone guide me toward the correct part, please?

Thanks very much