Severity: Fix within days. Drive with caution and watch for new symptoms.
The knock sensor on bank 1 is sending a weaker signal than expected, which usually means a wiring fault or a failing sensor.
Inspect the wiring and mounting, then replace the sensor if the signal stays low.
Avoid hard acceleration until it is fixed — the engine may not detect harmful detonation.
You can drive short distances carefully; watch for worsening symptoms. Avoid hard acceleration until it is fixed — the engine may not detect harmful detonation.
The most common causes are: Failed knock sensor; Damaged wiring; Corroded connector; Loose sensor mounting. A scan tool and a visual check of the parts above is where a technician starts.
Inspect the wiring and mounting, then replace the sensor if the signal stays low.
