"Could a bad sensor cause the car not to start? "

Could help if it already flooded the motor. But I thought it did start when aired out, but wouldn't keep running. That, and finding fuel in the tailpipe is why I thought FPR.

Also I misread your post thinking you had eliminated ignition as the trouble instead of asking if ignition could be the trouble after verifying spark at #1. It implied there are some previous threads; perhaps I should go looking for them to find out what brought on the condition.

As far as weak electrical connections, the one I asked about would be well checked by the resistance measurement. But, like any static measurement, the ohmmeter will not show up mechanical intermittents that don't happen to be having trouble at the time. Happened to me, but in LH2.0 the symptom was intermittent stalling and stinky poor idle.