Here's what you should do:
* Stop driving immediately: A flashing light means the misfire is severe and could lead to catastrophic engine failure.
* Have the vehicle towed: Don't attempt to drive it to a mechanic.
* Possible causes: A misfire in one cylinder can be caused by several things, including:
* Spark plug: A faulty, worn, or improperly gapped spark plug is a common culprit.
* Ignition coil: The ignition coil for cylinder 2 might be failing.
* Worn or damaged spark plug wire: A cracked or loose wire can prevent the spark from reaching the plug.
* Injector: A clogged or failing fuel injector can prevent fuel from reaching the cylinder.
* Valve problem: A burnt, bent, or sticking valve can interfere with combustion.
* Low compression: Low compression in the cylinder prevents proper combustion.
* Engine control module (ECM) problem: Although less likely, a faulty ECM can cause misfires.
What a mechanic will likely do:
A mechanic will diagnose the problem using a scan tool to get more information beyond the P0302 code. They will likely perform the following checks:
* Inspect spark plug and wire for cylinder 2: This is the first and easiest check.
* Test the ignition coil for cylinder 2: A coil test will determine if it's supplying sufficient voltage.
* Check fuel injector operation for cylinder 2: This can involve a fuel pressure test or injector flow test.
* Perform a compression test on cylinder 2: This measures the pressure inside the cylinder during combustion.
* Inspect the valve train: This might involve removing the valve cover to visually inspect the valves and rocker arms.
Important Note: The cost of repair can vary significantly depending on the underlying cause. A simple spark plug or wire replacement is relatively inexpensive, while a more serious issue like a valve problem or low compression could be much more costly. Get a diagnosis from a qualified mechanic as soon as possible to determine the best course of action and prevent further damage to your engine.
