Help with two check engine codes

My check engine light has been going off and on for a while now but recently stayed on. I got it checked at autozone today. The codes that popped up are P0157 which is heated o2 sensor- bank 2 sensor 2 circuit low voltage. And P0606 which is failed ECM. I'm hoping that its only the O2 sensor causing the problem. Any suggestions whether I need to replace the sensor itself or if the wiring has to do with it?

 

There is no way to just guess at if the sensor is bad or the wiring is a problem. While Tacoma O2 and A/F sensors are pretty common to failures, there is no way anyone here can tell you what is wrong with your particular truck with 100% certainty. While I am not one to suggest throwing parts at a problem, if you wanted to just try it, you could replace the suspected sensor, clear the codes, and then test drive it to verify the fix. Other than that you will need a good multimeter and wiring schematics for your truck to actually verify the fault.

 

Especially without any info about his truck.

Person: Hey Doc, My head hurts.
Doc: Sounds like a brain tumor, we must perform surgery now.

 

How many miles are on the sensors ? anything 90,000 - higher you
can pretty much bet it is a sour sensor (they do age out and crap out)

typically 130,000 miles your a/f or o2 are end of life pretty soon

 

The FSM has instructions for testing them. I don't have mine in front of me or I would post them.

 

Alright thanks guys. I'm going to replace the sensor and see what happens after that.

 

Curious, I read O2 sensor data and heater voltages all the time with my multimeter.

 

I see what you are meaning, but I use this data all the time to help me diagnose a faulty O2 sensor. While I agree that a digital oscilloscope is the best way to get solid numbers, they are much too expensive for a shop to own. I have had no problems at all finding failed O2 sensors simply with my scan tool and a digital multimeter. My scan tool has a built-in scope display which shows waveform, so I am good there.