P0325
Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
Description
Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor). This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Worn spark plugs, failed ignition coil, faulty injector, low compression in a cylinder
Solution
Read misfire counters per cylinder, inspect plugs and coils, swap the coil and injector to a neighbouring cylinder, run a compression test
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:
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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