EngineModerate✅ DIY Friendly

P0328

Q: What does OBD2 code P0328 mean?

P0328 means: Knock Sensor 1 Circuit High Bank 1. The knock sensor signal is above the maximum expected voltage.

Knock Sensor 1 Circuit High Bank 1

The knock sensor signal is above the maximum expected voltage.

SeverityModerate

CategoryEngine

Est. Repair Cost$100–$300

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Open circuit in knock sensor wiring
›Failed sensor
›Short to power in signal wire

⚠️ Symptoms

›Check engine light
›Possible timing advance without protection

✅ How to Fix — Step by Step

Step 1:Check for open circuit in wiring
Step 2:Test sensor
Step 3:Replace knock sensor

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Fuel Pressure Gauge
✔Compression Tester
✔Spark Tester

Using the correct diagnostic tools helps identify the root cause of P0328 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: A high knock sensor signal may prevent the ECU from retarding timing during actual detonation — causing engine damage.

Frequently Asked Questions

What does OBD2 code P0328 mean?+

P0328 stands for Knock Sensor 1 Circuit High Bank 1. The knock sensor signal is above the maximum expected voltage.

What causes code P0328?+

Open circuit in knock sensor wiring; Failed sensor; Short to power in signal wire

How do I fix code P0328?+

Check for open circuit in wiring; Test sensor; Replace knock sensor

How much does it cost to fix P0328?+

Estimated repair cost for P0328 is $100–$300.

Is P0328 DIY-friendly?+

Yes — P0328 is generally DIY-friendly with basic tools.

AI Diagnosis

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