P0325
Medium SeverityKnock Sensor 1 Circuit (Bank 1)
Ignition System
P0325 — Instant Answer
Knock Sensor 1 Circuit (Bank 1)
Severity: MEDIUM SEVERITY
Meaning: The knock sensor on bank 1 has a circuit fault. Without it, the ECM cannot detect engine knock (detonation) and must retard ignition timing for safety.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $20 - $400
Most common causes:
- 1. Failed knock sensor (35-45% of cases)
- 2. Corroded sensor connector (10-25% of cases)
- 3. Wiring damage (10-25% of cases)
- 4. Sensor not torqued properly (10-25% of cases)
Symptoms
- ⚠️Reduced engine power
- ⚠️Poor fuel economy
- ⚠️Slight pinging under load
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0325
- 1Inspect knock sensor connector
- 2Check wiring for damage
- 3Measure sensor resistance
- 4Verify proper torque if recently serviced
OEM Procedures for P0325
P0325 affects the Knock Sensor. Found 9 OEM service manual procedures.
Knock Sensor
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Knock Sensor - Front Knock Sensor Replacement
Showing 8 of 9 procedures
OEM Diagnostic Flowchart
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Repair guides, symptom pages, and wiring diagrams related to P0325.
OEM Manual Evidence
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Related Symptoms
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Related Codes
Frequently Asked Questions
- Can I drive without a knock sensor?
- Yes, but the ECM retards timing for safety, reducing power and fuel economy by 5-10%.
- Where is the knock sensor?
- Usually bolted to the engine block or under the intake manifold. On some engines it is hard to reach.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07