P0328
Medium SeverityKnock Sensor 1 Circuit High (Bank 1)
Ignition System
P0328 — Instant Answer
Knock Sensor 1 Circuit High (Bank 1)
Severity: MEDIUM SEVERITY
Meaning: Knock sensor signal is too high. Could be a noisy engine or a sensor fault.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $20 - $400
Most common causes:
- 1. Engine mechanical noise being misread (35-45% of cases)
- 2. Faulty sensor (10-25% of cases)
- 3. Short in wiring (10-25% of cases)
Symptoms
- ⚠️Excessive timing retard
- ⚠️Loss of power
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0328
- 1Listen for engine mechanical noises
- 2Check for exhaust leak near sensor
- 3Replace sensor if no mechanical issue found
OEM Procedures for P0328
P0328 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 P0328.
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 below expected minimum. Usually an open circuit or failed sensor.
Frequently Asked Questions
- Can an exhaust leak cause P0328?
- Yes — an exhaust leak near the knock sensor can create vibrations that the sensor interprets as knock.
- What if P0328 comes back after replacing the sensor?
- There may be actual engine knock from carbon buildup, low octane fuel, or a mechanical problem causing excessive vibration.
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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