Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
The P0326 code means the vehicle's onboard diagnostic system has detected: Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
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What Are the Symptoms of P0326?
- Check Engine Light illuminated
- Reduced engine power
- Engine knock or pinging under load
- Poor fuel economy
- PCM retards ignition timing as a precaution
What Causes P0326? (Most Likely First)
- Faulty knock sensor 1 Very High
- Incorrect knock sensor torque (too loose or too tight) High
- Engine mechanical noise interfering with knock sensor signal Moderate
- Damaged wiring or connector to knock sensor Moderate
- PCM knock sensor input circuit issue Low
Can I Still Drive with P0326?
Short distances only. P0326 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Can I drive with code P0326?
You can drive short distances. The PCM will retard ignition timing as a safety measure, reducing power and fuel economy. However, if actual engine knock is occurring, continued driving can cause engine damage.
Where is the knock sensor located?
The knock sensor is typically bolted to the engine block, often underneath the intake manifold. On V-engines, there is usually one sensor per bank. Accessing it may require removing the intake manifold.
Does the knock sensor torque really matter?
Yes. The knock sensor is a piezoelectric device that generates voltage from vibration. If it is too loose, it will not detect knock properly. If too tight, it can generate false signals or crack.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0326?
-
Monitor knock sensor signal with a scan tool -- tap the engine block near the sensor and watch for a voltage spike
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Check knock sensor torque -- must be tightened to the manufacturer specification (typically 15-20 ft-lbs)
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Inspect knock sensor connector for corrosion, oil contamination, or damage
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Test knock sensor resistance -- typical range is 100K-600K ohms depending on type
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Listen for abnormal engine mechanical noises (rod knock, piston slap) that could trigger false knock readings
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P0326?
- 2007-2017 Toyota Camry
- 2008-2018 Honda Accord
- 2005-2015 Nissan Altima
- 2010-2020 Subaru Outback
- 2009-2019 Chevrolet Silverado
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