The most common causes of a flashing check engine light include:
* Misfire(s): This is the most frequent culprit. A misfire occurs when one or more cylinders aren't igniting properly. This can lead to excessive wear on the catalytic converter, potentially damaging it beyond repair.
* Severe Ignition System Problem: Issues with the spark plugs, ignition coils, ignition wires, or distributor (if equipped) can cause misfires and lead to a flashing light.
* Problems with the Catalytic Converter: While a failing catalytic converter will usually trigger a *steady* check engine light, severe issues *could* cause a flashing light, especially if it's causing a misfire.
* Fuel System Problem: A severe problem with fuel delivery, such as a clogged fuel injector or low fuel pressure, can also cause misfires.
* Severe Exhaust System Leak: A major leak before the oxygen sensor could cause a misfire and trigger a flashing light.
What NOT to do:
* Don't ignore it: Continuing to drive with a flashing check engine light risks significant engine damage.
* Don't assume you know the cause: Guessing can lead to more problems and expense.
What TO do:
* Pull over safely as soon as possible: Do not continue driving until the issue is addressed.
* Get it diagnosed: Use an OBD-II scanner to read the trouble codes stored by the vehicle's computer. This will give you a much better idea of the specific problem. Auto parts stores often offer free code reading services.
* Have a qualified mechanic diagnose and repair the issue: Based on the trouble codes, a mechanic can accurately pinpoint the problem and fix it correctly.
A flashing check engine light is a serious warning sign, and prompt action is crucial to prevent costly repairs down the line.
