99 LE Check Engine light Errors 1130,1135

[elfmuse]

Hi my check engine light came on while going to work yesterday. Pulled over at autozone to get free readout and the told me I had two Error's 1130, 1135 Air/Fuel Sensor.

So hear are my questions?
Where is this/these sensors?
What do they Look like?
What are model numbers?

Is it possible to replace on my own? I'm not a mechanic but can be handy at times and actually replace the rear drivers side window motor once.

I was thinking might be able to pull one out at a junk yard or should I just buy new?

Thanks For All The Help Ahead Of Time

Lastly, how critical are these sensors for driving the car? I may have to wait another 2 weeks till my paycheck to pay mechanic to have the work done. Hence why I'm hear first.

[lsac]

This topic is popular. My 2000 Sienna is also having 1130 and 1135 codes. After many days of online research, I have found the OEM and Denso part number for bank 1 sensor 1. OEM #89467-41021, Denso #234-9007. Denso part is less expensive for about $128 with free shipping.