Hey thanks for that link I appreciate it. I found the 02sensors through there at RockAuto parts for 52$ a piece. It's crazy my auto parts store here in Montreal 'napa autoparts' quoted me 132$ ea and for NGK brand? Any personal feedback on RockAuto Parts?

1 other question, when I've cleared my engine code of the P0141, it literally doesn't come back on till I've driven another 300km or more? Also I noticed that my oil change indicators have been showin 3 bars since I bought it and I know its like way over due to be changed? Is it possible when I've cleared the engine light it has been resetting everything else too? ( sorry if that's an amateur question) and thanks again for your help