I don't have a blow torch. I have a small tool set and live in a college town so maintenance opportunities besides the dealer are limited.
There are apparently 2 Oxygen sensors on the vehicle as it is OBDII.
I do not want to throw parts at it believe me, I started with the cheapest possible and worked my way up, now its getting expensive.

I am familiar with use of a voltmeter what is the voltage range I am looking for?
Why do I need a blow torch...?