hi,    anyone have any idea how much a oxygen senor is roughly about ? for a Toyota Argo 2014  the 3 yellow light came up on my car engine, , sip trac, and type pressure ( there ok as I've checked ) called AA just to ask what the problem is and he's pretty sure its a sensor and possible update think he said don't want to use the Toyota garage itself as there very expensive  thanks in advance for replies