Would the oil sending unit on a Chrysler pt cruiser cause it not to start?

No, a faulty oil sending unit on a Chrysler PT Cruiser would not directly prevent the engine from starting. The oil sending unit's job is to measure oil pressure and send that information to the gauge on the dashboard. A malfunctioning unit might cause the oil pressure gauge to read incorrectly (or not at all), but it doesn't control the engine's starting mechanism.

While a *very* low oil pressure (which the faulty sending unit might *indirectly* indicate, if it's reading zero when there actually is oil pressure), *could* be a reason for an engine to not start (because the low oil pressure could trigger safety cutouts), it's more likely that the problem lies elsewhere if your PT Cruiser won't start. The starting system is far more complicated and involves things like the battery, starter motor, ignition system, fuel system, and the engine's computer.