nah, a knock sensor is just telling you that your motor is giving off too much vibration (knock). Its mainly there to let you know something is amiss.
Check your distributor, take the cap off, then remove the rotor and check the distributor thoroughly for any presence of oil. Its very common for the oil seals to let go and cover the sensor inside. It could be your problem.
Other than that I'd do some common maintenance items
- Cap
- Rotor
- Air Filter
- Fuel Filter
- Plugs (if you're over 70K miles)
- Wires (if you're over 70k miles)
They're always a good idea. They might not help the "no start" condition but they could be worn down. Do the plugs especially if there is oil in the distributor. You'll have to replace the distributor if there is oil and the plugs will undoubtedly be fouled up.
Hope that helps
Darktide