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 |
|---|---|
| System | Engine and transmission |
| Group | P03xx, Ignition and misfires |
| Type | Generic: 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.
Open the bonnetthe in-depth explanation
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 its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
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 an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0322 No ignition or distributor engine speed signal
- P0323 The crankshaft position or engine speed sensor circuit fails intermittently
- P0324 There is a fault in the engine knock control system
- P0325 Knock sensor 1 circuit fault (bank 1 or single sensor)
- P0327 Knock sensor 1 circuit low input (bank 1 or single sensor)
- P0328 Knock sensor 1 circuit high input (bank 1 or single sensor)
- P0329 The circuit signal from knock sensor 1 on bank 1 is intermittent
- P032A The knock sensor 3 (bank 2) has an electrical fault
- P0300 Random or multiple cylinder misfire
- P0301 Misfire detected in cylinder 1
- P0302 Misfire detected in cylinder 2
- P0303 Misfire detected in cylinder 3
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.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
