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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Parts & Tools for This Job
Common parts shoppers buy for P0325 Knock Sensor 1 Circuit (Bank 1).
Oxygen Sensor
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Spark Plugs
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Ignition Coils
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Mass Air Flow Sensor
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0325.
OEM Manual Evidence
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Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
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
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-11-07