P0325
Knock Sensor 1 Circuit Malfunction
Description
Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor) This body system diagnostic trouble code indicates an issue with the vehicle's comfort, safety, or convenience systems.
OBD Codes Details
Possible Causes
Blown fuse, faulty switch, damaged wiring harness, poor electrical connection
Solution
Check fuses and relays, inspect wiring harness, test switches and sensors, repair damaged circuits
Symptoms
- Check engine light illuminated
- Engine pinging or knocking under load
- Reduced power due to retarded ignition timing
- Poor fuel economy
- Rough running under acceleration
Diagnostic Recommendations
- Inspect knock sensor wiring and connector for damage
- Test knock sensor resistance and output signal
- Check sensor mounting torque on the engine block
- Verify no engine mechanical noise is being misread as knock
- Replace knock sensor if it fails resistance or signal tests
Repair Cost Estimate
- Knock sensor replacement: $100-300
- Wiring harness repair: $80-250
- Intake manifold removal labor (if required for access): $150-400
- Diagnostic scan: $80-150
- Total diagnostic and repair: $150-900
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Fact-checking completed
Verified by:
Pavel Volkov
Created:
Last updated:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
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