Yes, one defective spark plug can cause the check engine light to come on. That one plug can be not firing properly and this would cause a miss on that cylinder. That miss would cause the ECU to set a fault code. The code will tell you what component is being effected. My advice is to replace that plug. Always replace plugs as a set, and never leave one old plug installed.
If the check engine light is flashing with the engine running , that means a spark plug misfire has been detected
why does my check engine light stay on and want go off
An engine cylinder misfire has been detected if your check engine light is flashing
If the check engine light is flashing that means an engine cylinder misfire has been detected
If the check engine light is flashing that means an engine cylinder misfire has been detected
If the check engine light is blinking with the engine running , a spark plug misfire has been detected - get it scanned for trouble codes in order to diagnose and then repair the problem as soon as possible . If you don't , and continue driving with the check engine light blinking , you risk damaging your catalytic converter
No - check engine light is related to emission control system
If the check engine light is flashing a spark plug misfire has been detected - have it scanned for trouble codes to diagnose and repair as soon as possible
yes
If the check engine light is blinking that indicates an engine cylinder misfire has been detected
If the check engine light is flashing at 1 second intervals , an engine cylinder misfire has been detected
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.