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Will check engine light come on with a bad knock sensor 1998 Subaru Forester?

Yes, a bad knock sensor can turn on the check engine light in a 1998 Subaru Forester.

This light is designed to illuminate when the onboard diagnostics (OBD) system of the vehicle has detected an issue. A faulty knock sensor, which monitors engine performance and combustion irregularities, can trigger the check engine light as the ECU (Engine Control Unit) identifies the sensor malfunction and stores a trouble code related to the knock sensor issue.