P0326: Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
2 vehicles · 2 makes · $200-$1,200 repair
Most Reported On
P0326 is an OBD-II diagnostic trouble code meaning “Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor).” P0326 is a generic powertrain code indicating the engine computer detected that the knock sensor 1 (bank 1) signal is outside its expected range or performing improperly. The knock sensor listens for engine 'knock' (pre-ignition/detonation) so the PCM can retard timing to protect the engine; an out-of-range signal means the computer can no longer rely on it. This usually causes reduced performance and fuel economy and, if knock goes undetected, possible long-term engine wear. This code is most commonly reported on 2019-2021 Hyundai Veloster (2.0, 2.0 Premium), and 2021-2025 Kia K5, with repair costs ranging from $200 to $1,200.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0326, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (2)
FAQ
What does P0326 mean?
P0326 stands for "Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)." P0326 is a generic powertrain code indicating the engine computer detected that the knock sensor 1 (bank 1) signal is outside its expected range or performing improperly. The knock sensor listens for engine 'knock' (pre-ignition/detonation) so the PCM can retard timing to protect the engine; an out-of-range signal means the computer can no longer rely on it. This usually causes reduced performance and fuel economy and, if knock goes undetected, possible long-term engine wear.
What are the most common causes of P0326?
The most common causes of P0326 are: Faulty knock sensor, Damaged knock sensor wiring or connector, Corrosion or poor contact at the sensor, Engine mechanical noise mimicking knock, Loose sensor mounting / incorrect torque, Wiring shorted or open to the PCM, PCM fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0326?
Repair costs for P0326 range from $200 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by P0326?
Au7o has documented P0326 across 2 vehicle models from 2 manufacturers: Hyundai, Kia.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.