KlaroFault codeP0334
SEVEREKnock Sensor 2 Circuit Input Intermittent (Bank 2)
What this code means
Knock Sensor 2 Circuit Input Intermittent (Bank 2).
“Bank 1” is the side of the engine that holds cylinder number 1; “Bank 2” only exists on V and flat engines. An in-line engine has a single bank.
P0334 is a generic code: it means the same thing on every make. P0334 belongs to family P03xx — Ignition and misfire. Its page explains how to read a code and groups all its codes by part.
Type of fault
The signal drops out or jumps from time to time. This is typical of a poor contact: a loose or corroded connector, or a chafed wire that touches intermittently, often triggered by vibration or heat. The fault may disappear and come back; checking the wiring with the engine running is often revealing.
Knock sensor
The knock sensor is a small microphone bolted to the engine block. It listens for the sharp vibration of knock, abnormal combustion that can damage pistons. When it hears it, the control unit retards the ignition timing on the cylinder concerned.
What you notice
Usually little: the control unit retards ignition as a precaution, so the engine may lack power and consume more. Audible pinging under load points to real knock.
How to check it
The sensor must be tightened to the right torque on a clean surface: too loose or too tight, it hears badly. Check its connector and wiring, often under the intake manifold. In Klaro, a timing advance that stays very low under load hints that the control unit is retarding ignition.
Watch it live in Klaro
With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:
- Timing advance
- Engine RPM
What to do
Have it checked promptly. A misfire sends unburnt fuel into the exhaust and destroys the catalytic converter within a few dozen kilometres. If the light is flashing, stop driving.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →
How to read this code
- PPowertrain
- 0standardised code
- 3Ignition and misfire
- 34P0334
Other codes for the same part
- P0325Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
- P0326Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
- P0327Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)
- P0328Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
- P0329Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)
- P0330Knock Sensor 2 Circuit Malfunction (Bank 2)
- P0331Knock Sensor 2 Circuit Range/Performance (Bank )
- P0332Knock Sensor 2 Circuit Low Input (Bank 2)
- P0333Knock Sensor 2 Circuit High Input (Bank 2)
