Hi all Need some help regarding the engine management light on my Prius gen3. 09 plate The light came on the other day and I took it to be switched off, the mechanic told me that the code reading was showing a fault with the lambda (o2) sensor My questions are 1 how many lambda (o2) sensors are there on a Prius gen3, 2 where are they on the exhaust , 3 are these covered under the warrantee and if not where to buy one.
