* Crankshaft Position Sensor (CKP Sensor): This is a very common cause of this type of problem. The CKP sensor tells the computer the engine's rotational position. A faulty sensor, especially one that's failing intermittently due to heat, age, or corrosion, can cause the engine to suddenly cut out. The car may then restart as the sensor cools or briefly works again.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a failing CMP sensor can cause the same symptoms. It monitors the camshaft's position.
* Ignition Switch: A failing ignition switch might not be consistently making proper contact, leading to an interruption in power to the engine.
* Battery/Alternator: While less likely to cause a complete shutdown and immediate restart, a weak battery or failing alternator could cause voltage drops sufficient to cause the car to stall. Check the battery terminals for corrosion. Have the charging system tested.
* Mass Airflow Sensor (MAF Sensor): A dirty or failing MAF sensor can cause erratic engine behavior, including stalling. However, this is less likely to be the sole cause of a complete, immediate shutdown followed by a normal restart.
* Wiring Harness Issues: A corroded or damaged wire in the engine bay's wiring harness can cause intermittent interruptions. This is more difficult to diagnose.
* Computer (PCM) issues: While less common, a problem with the Powertrain Control Module (the car's computer) could be causing the issue. This is usually a more involved and expensive fix.
What to do:
1. Check the obvious: Inspect battery terminals for corrosion and clean them. Make sure all connections are tight.
2. Have the charging system tested: An auto parts store can often do this for free. Check the alternator's output voltage.
3. Consider the sensors: The CKP and CMP sensors are relatively inexpensive and easy to replace. If you're comfortable working on cars, you could try replacing these first. Otherwise, a mechanic should be able to test these sensors relatively quickly.
4. Professional Diagnosis: If the simple checks don't reveal the problem, it's best to take the car to a qualified mechanic. They have diagnostic tools that can read the car's computer for trouble codes (DTCs), which can pinpoint the issue more accurately.
Don't continue driving the car extensively if it's exhibiting this erratic behavior, as it could leave you stranded in a dangerous situation. The intermittent nature of the problem makes it harder to diagnose, so a professional diagnosis is often the best approach.
