Help me! Code P2A00 Oxygen sensor circuit range/performance bank 1 Sensor 1 2008 honda Crv ex?

I have an 2008 Honda crv Ex and this code came up "Code "P2A00"
Oxygen sensor
circuit range/performance bank 1
Sensor 1 i want to replace it myself because i know its simple and the dealer wants to charge me over $300 and i can do it for half the cost when i looked it, it has two sensors together one closer to the engine and the other a bit more behind it i don't know with of the two it is.

2000 Manual Honda CRV misfiring?

Earlier today my CRV misfired on my way home, while I was trying to get it going in first. Once the blinking engine light turned on I pulled over and turned the car off. A couple minutes later I turned the car back on and it seemed fine. I had to drive 2 hours back home and it sounded fine and no lights came on. Do I still need to take it to the mechanic?

Honda crv (52 plate ) mot advisory?

Suspension arm rubber bush deteriorated but not resulting in excessive movement nearside front [2.4.g.2]
Can anyone tell me what part I need to get to correct this and if it is possible for me to do myself or does it need to be done in a garage with specialist tools. If possible please provide me with pic or link of part required for purchasing I'm in uk in case that makes a difference