P0327
Medium SeverityKnock Sensor 1 Circuit Low (Bank 1)
Ignition System
P0327 — Instant Answer
Knock Sensor 1 Circuit Low (Bank 1)
Severity: MEDIUM SEVERITY
Meaning: Knock sensor signal is below expected minimum. Usually an open circuit or failed sensor.
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. Loose sensor (10-25% of cases)
- 3. Open wire (10-25% of cases)
Common Causes
How to Diagnose P0327
- 1Check sensor torque and connector
- 2Measure resistance
- 3Check wiring
- 4Replace sensor
OEM Procedures for P0327
P0327 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 P0327.
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 >...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Related Symptoms
Browse →Related Codes
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.
Knock sensor signal is too high. Could be a noisy engine or a sensor fault.
Frequently Asked Questions
- What causes a knock sensor to fail?
- Age, heat cycling, and corrosion. Knock sensors are piezoelectric and wear out over 100K+ miles.
- Does knock sensor torque matter?
- Yes — knock sensors must be torqued to spec (typically 15-20 ft-lbs). Too loose or too tight causes incorrect readings.
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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