Knock Sensor 1 Circuit Malfunction (Bank 1)

What This Means

The knock sensor on bank 1 is not providing a valid signal. This sensor detects engine knock (detonation) and tells the computer to retard ignition timing to prevent engine damage.

Common Symptoms

• Check engine light on
• Engine may feel sluggish (retarded timing)
• Possible engine knock under load
• Reduced fuel economy

Common Causes

• Failed knock sensor
• Damaged wiring to knock sensor
• Loose sensor mounting
• Corroded connector
• Engine mechanical noise confusing the sensor

Estimated Repair Cost