P0334 Knock Sensor 2 Circuit Intermittent (Bank 2)

P0334 indicates an intermittent Knock Sensor 2 circuit on Bank 2. The signal is available at times but drops out or spikes outside expected behavior.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not judge P0334 from a quick idle test only; intermittent knock sensor faults often need heat and vibration to appear.

Symptoms of P0334

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0334

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Check when the code sets, including heat soak, acceleration, road vibration, moisture, and engine movement, then compare Bank 2 knock data to Bank 1.
Inspect harness flex points, connector tension, shielding, sensor mounting, water intrusion, and wiring near the intake, exhaust, or engine mounts.
Capture live data during a road test to identify brief Bank 2 knock signal interruptions that are not visible during key-on checks.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.