Knock sensor 1 circuit — Bank 1 or single sensor
The controller detected an electrical or performance problem in the Knock Sensor 1 path for the identified bank or single-sensor application.
Conditions that can produce P0325
These are diagnostic branches, not a ranked parts list. Prevalence and testing order depend on the exact vehicle and failure scene.
- Sensor or sub-harness open/short
- Connector, shielding, or ground problem
- Incorrect sensor torque or mounting surface
- Internal harness damage beneath an intake assembly
- Mechanical noise or calibration issue affecting the test
What to inspect next
- Use the exact sensor location and circuit diagram
- Check harness routing, connector condition, and specified torque
- Separate circuit integrity from abnormal-combustion concerns
- Avoid resistance or impact tests not approved for the sensor type
Evidence that strengthens the answer
Verify the repair
Preserve the pre-repair record, document exactly what changed, then repeat the relevant operating condition safely. Confirm no current or pending fault returns, review permanent-code and readiness state where applicable, and state which tests or modules remained unavailable.
This page explains a commonly standardized code at a general level. Confirm the exact definition, module, status, test conditions, thresholds, wiring, and service process for the vehicle application using current official information.