'ASE Automobile Parts Specialist (P2) Practice Test 2025 – All-in-One Resource for Exam Success!'

A "Check Engine" light indicating a cylinder misfire is often related to issues within the ignition system, fuel delivery, or engine mechanical problems. Worn spark plugs are a common cause of a misfire because they play a crucial role in igniting the air-fuel mixture within the cylinder. If the spark plugs are worn, fouled, or damaged, they can fail to create the necessary spark for ignition, leading to a misfire.

When the engine control unit detects that a misfire is occurring, it triggers the "Check Engine" light to alert the driver. Worn spark plugs can cause incomplete combustion, leading not only to misfires but also to reduced engine performance, increased fuel consumption, and higher emissions.

The other potential causes, while they can impact engine performance, don't directly lead to a misfire in the same straightforward way as worn spark plugs do. A defective fuel pump might lead to inadequate fuel delivery affecting engine performance but is less likely to cause a misfire directly related to a single cylinder. Exhaust blockage may create backpressure issues but typically affects overall engine performance rather than targeting individual cylinders. Low oil level is critical for engine lubrication and longevity but does not directly link to ignition faults in specific cylinders. Thus, worn spark