Q: Q: Clicking Sound

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i have a oil leak & possible a coolant leak. the car has been running fine, recently i tried to start my car & it clicked really loud a couple of times & gave up. it wont start but it cuts on, lights work. & i replaced the started with a new used one some months ago ( maybe 5-6 ). i wondered if my engine locked. i took it to get it scanned when my engine light came on & they said i need a knock sensor. i never replaced it because my engine light went off & hasnt alerted me since. i just need an insight of what the problem might be & if it is worth fixing!

My car has 230000 miles.
My car has an automatic transmission.

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