* Loose or disconnected battery cable: While changing the tire, you might have accidentally bumped or loosened a battery cable. Check both the positive (+) and negative (-) cables to make sure they're securely attached to the battery terminals. Corrosion can also interfere with the connection. Clean the terminals if necessary.
* Dead battery: The starting process draws significant power. If your battery was already weak, the extra electrical demands of the radio, lights, etc. while you were changing the tire may have drained it completely. Try jump-starting the car.
* Faulty ignition switch: This is less likely related to changing a tire but possible. Try jiggling the key in the ignition. If the switch is failing, it might not be making proper contact.
* Security system issue: Some vehicles have security systems that will disable the car if they sense tampering (although unlikely directly related to just changing a tire). Check your owner's manual for information about how to troubleshoot your security system.
* Coincidence: It's possible the tire change and the car not starting are purely coincidental. The car might have developed a separate problem unrelated to the tire change.
Troubleshooting steps:
1. Check the battery cables: This is the most likely culprit.
2. Try jump-starting: If the battery is dead, this will tell you if that's the problem.
3. Check the ignition switch: Jiggle the key and make sure it's fully seated.
4. Check the other obvious things: Are the lights working? Does the radio turn on? This helps rule out a major electrical issue.
5. Consult your owner's manual: See if it has any troubleshooting advice for starting problems.
If none of these steps work, you'll likely need to have your car checked by a mechanic to diagnose the problem. There's no easy way to remotely diagnose a no-start condition.
