im pretty sure that my o2 sensor is causing my car not to start and I have a leak that is getting my back floor board behind passenger seat wet. Any help would be appreciated. Thanks

 

Did you scan for any stored OBD2 codes? A more likely cause of a crank/no start is a fuel pressure issue - have you tested for that? I'd think even with a bad o2 sensor you'd get at least a rough start. For the leak, do you notice a loss of coolant? If not then read up clogged sun roof drains. Do you notice a sweet smell when the heater first comes on? thats a sign of a leaking heater core or the hose o-rings. Check for any YouTube vids on how to replace the heater core.