OBD-II Fault Code

P0333: Knock Sensor 2 Circuit High Input (Bank 2)

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0333.

System family

Powertrain

Generic/SAE

Repair category

Knock sensor / ignition control

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What P0333 usually means

Knock Sensor 2 Circuit High Input (Bank 2).

Common symptoms

Check Engine light; Poor drivability or reduced fuel economy depending on fault

Likely causes

Faulty knock sensor; Wiring fault; Engine mechanical noise; Incorrect fuel octane; High signal voltage; Open ground; Short to voltage; Failed sensor

Diagnostic checks

Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Inspect sensor wiring and mounting; Check for engine noise and correct fuel; Check sensor ground and signal circuit for short to voltage

Repair guidance

Repair wiring, replace sensor if confirmed, address mechanical noise/fuel issue; Repair ground/signal circuit or replace confirmed faulty sensor

Verification after repair

Clear code, road-test through the same drive condition, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary. A DTC identifies a circuit or system condition, not always the failed part.