The Best My Car Check Engine Light Is On Ideas. Another approach is to purchase an obd (onboard diagnostics) reader for about $75 and plug it into your vehicle's obd port (usually found under the dash, just below the steering wheel). Web what to do when the check engine light comes on.

Web tighten the gas cap: Other problems that can activate the light include faulty spark plugs or wires, malfunctioning ignition coils, a bad mass air flow (maf) sensor, a failing or clogged catalytic converter, intake vacuum leaks, or leaks in the evaporative. Web the reason the check engine light comes on is because the system throws a code telling you what’s wrong.
