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P0326: Knock sensor 1 signal out of range (bank 1 or single sensor)

The knock sensor signal does not match what the ECU expects. It may be a loose or faulty sensor, its wiring or real engine noise.

Code P0326 at a glance
CodeP0326
SystemEngine and transmission
GroupP03xx, Ignition and misfires
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P0326 means

The knock sensor is bolted to the engine block and works like a microphone: it picks up the vibration of knock (detonation, fuel burning at the wrong moment and hammering the pistons). When it hears it, the ECU retards the ignition to protect the engine. Here the circuit works, but the signal is too strong, too weak or inconsistent with how the engine is running. It is sensor 1, on bank 1 or the only one.

Most common causes

  • Sensor loose or tightened to the wrong torque
  • Connector or wiring with poor contact or interference
  • Poor quality fuel or lower octane than specified, causing real knock
  • Mechanical engine noise (loose parts, play, mounts) that the sensor mistakes for knock
  • Failed knock sensor

Symptoms

  • Less power, especially under hard acceleration
  • Slightly higher fuel consumption
  • Engine warning light on
  • Sometimes no noticeable symptoms

Can you drive with P0326?

With care You can drive, as the ECU usually retards the ignition as a precaution, but the engine is less protected if real knock occurs. Avoid working it hard and get it checked soon.

How to check it

Listen for a metallic rattle or pinking when accelerating in a high gear: if you hear it, there may be real knock and it is worth trying the fuel grade the manufacturer specifies.

How to read and clear P0326 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0326 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P0326 is a generic code, so it means the same on any make, for example on BMW, Ford, Mercedes-Benz, Renault, Volkswagen, Volvo. See what Final OBD does on your car in makes and models.

What does code P0326 mean?

The knock sensor is bolted to the engine block and works like a microphone: it picks up the vibration of knock (detonation, fuel burning at the wrong moment and hammering the pistons). When it hears it, the ECU retards the ignition to protect the engine. Here the circuit works, but the signal is too strong, too weak or inconsistent with how the engine is running. It is sensor 1, on bank 1 or the only one.

Can you drive with P0326?

You can drive, as the ECU usually retards the ignition as a precaution, but the engine is less protected if real knock occurs. Avoid working it hard and get it checked soon.

How do you clear P0326?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0326 comes back.