P0330 on Toyota
Knock Sensor 2 Circuit (Bank 2)
P0330 on Toyota vehicles indicates knock sensor 2 circuit (bank 2). Au7o has documented this code across 1 Toyota model — most commonly on 4Runner. This powertrain code means the engine computer detected a malfunction in the circuit for knock sensor 2, located on engine bank 2 (the cylinder bank not containing cylinder 1). The knock sensor listens for engine 'knock' or 'ping' (abnormal combustion) and lets the computer retard ignition timing to prevent engine damage. This code indicates an electrical/circuit problem with the sensor signal, not necessarily actual knocking. Drivability is often normal, but the engine may run with conservative timing, reducing power and economy and risking damage if real knock occurs. Typical repair costs on Toyota range from $150 to $900, depending on the specific model and root cause.
Common Causes of P0330
- •Faulty knock sensor on bank 2
- •Damaged or corroded knock sensor wiring/connector
- •Open or short in the knock sensor circuit
- •Loose or improperly torqued knock sensor
- •Engine ground or shielding issues affecting the signal
- •Faulty engine control module (rare)
P0330 on Toyota by Model
Toyota 4Runner(1 issue)
- 3.4L 5VZ-FE Knock Sensor & Sub-Harness Failure (P0325/P0330) — Brittle Harness Under Intake1996-2002
On the 3rd-gen 4Runner's 3.4L 5VZ-FE V6, the two knock sensors sit in the engine valley beneath the upper and lower intake manifolds, and their sub-wiring harness bakes over time. The harness insulation becomes brittle and crumbles, opening the circuit and setting P0325 (knock sensor 1 circuit) and/or P0330 (knock sensor 2 circuit). The ECU then pulls timing, hurting fuel economy and power. It is a very high-demand repair topic because the fix is buried under the intake, and because the ECU is extremely sensitive to sensor signal quality.
Looking for P0330 on a different make?
View P0330 across all makes →Frequently Asked Questions
What does P0330 mean on Toyota?▼
P0330 stands for "Knock Sensor 2 Circuit (Bank 2)." This powertrain code means the engine computer detected a malfunction in the circuit for knock sensor 2, located on engine bank 2 (the cylinder bank not containing cylinder 1). The knock sensor listens for engine 'knock' or 'ping' (abnormal combustion) and lets the computer retard ignition timing to prevent engine damage. This code indicates an electrical/circuit problem with the sensor signal, not necessarily actual knocking. Drivability is often normal, but the engine may run with conservative timing, reducing power and economy and risking damage if real knock occurs. On Toyota specifically, this code is documented across 1 model.
What causes P0330 on Toyota vehicles?▼
Common causes on Toyota: Faulty knock sensor on bank 2, Damaged or corroded knock sensor wiring/connector, Open or short in the knock sensor circuit, Loose or improperly torqued knock sensor, Engine ground or shielding issues affecting the signal. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0330 on a Toyota?▼
Repair costs on Toyota range from $150 to $900, depending on the specific model and root cause.
Which Toyota models have P0330 documented?▼
Au7o has documented P0330 on 1 Toyota model: 4Runner.