P0326: Knock Sensor 1 Circuit Range/Performance (Bank 1)
Can you still drive? Yes, but the ECM may retard ignition timing as a precaution, resulting in reduced power and lower fuel economy.
What Does P0326 Mean?
Code P0326 means the knock sensor on bank 1 is producing a signal outside the expected range. The knock sensor detects engine detonation (knock) and allows the ECM to retard timing to prevent damage. A malfunctioning sensor can cause the ECM to either over-retard or under-retard timing.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty knock sensor
- Incorrect sensor torque specification
- Engine mechanical noise misinterpreted by sensor
- Corroded sensor connector
- Wiring issue between sensor and ECM
Symptoms
- Check engine light on
- Reduced engine power
- Decreased fuel economy
- Engine pinging or knocking under load
- Sluggish acceleration
Diagnostic Steps
- 1Check knock sensor signal with a scan tool during driving
- 2Inspect knock sensor connector for corrosion
- 3Verify sensor torque to manufacturer specification
- 4Listen for abnormal mechanical engine noises
- 5Test sensor resistance and compare to specifications
Recommended Parts & Tools
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $75 - $400 |
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Frequently Asked Questions
What happens if I ignore a knock sensor code?
The ECM will likely retard timing excessively to protect the engine, costing you power and fuel economy. If the sensor fails completely, actual knock could go undetected and damage the engine.
Does the knock sensor need to be torqued precisely?
Yes, knock sensors are piezoelectric devices that are extremely sensitive to mounting torque. Over- or under-tightening can cause false readings.
Community Fix Reports
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