P0332: Knock Sensor 2 Circuit Low (Bank 2)

What does P0332 mean?

Knock sensors listen for detonation (pinging) in the cylinders. When knock is detected, the computer retards ignition timing to protect the engine. P0332 means the signal from sensor 2 is lower than specification.

Both references note that engine conditions which cause real knock, such as overheating, a lean mixture or EGR problems, are linked to this code, so a new sensor is not always the fix. RepairPal lists replacing the sensor when the wiring, cooling system or EGR system was the real cause as common misdiagnoses.

Common symptoms

• Check engine light on
• Pinging when accelerating
• Engine running hotter than normal
• Loss of power in some cases

Common causes

The causes below are the ones commonly seen with P0332. The actual cause can vary by vehicle, engine and mileage, so treat this list as a starting point, not a diagnosis.

• A faulty knock sensor
• A fault in the knock sensor circuit or its connectors
• A lean air fuel mixture
• A cooling system problem
• An EGR system fault

What to check with a scanner

• Read freeze frame data, including coolant temperature, load and rpm.
• Watch coolant temperature in Live data during a drive. Overheating causes knock.
• Check long term fuel trim for a lean condition.
• Note other codes, especially EGR, lean or cooling codes.

How to read and clear P0332 with OBD Master Pro

1. Plug in your adapter. Connect a generic ELM327 (or ELM329) OBD2 adapter to the diagnostic port, usually under the dashboard on the driver's side. Bluetooth Classic, Bluetooth LE, Wi-Fi and USB OTG adapters are supported.
2. Switch the ignition on. Turn the key to ON or start the engine, depending on your car.
3. Connect in OBD Master Pro. Open the app, go to Connection and pick your adapter. Classic Bluetooth adapters connect from the Bluetooth tab, Bluetooth LE adapters from the BLE tab with no pairing needed. Use the generic OBD2 / EOBD profile or your car's brand profile.
4. Read the codes. Open the fault codes screen to see stored, pending and permanent codes. Confirm P0332 is listed and note any other codes, since they often explain the cause.
5. Check the details. Look at freeze frame data, Live data and, where your car supports it, Mode 06 test results (see the checks above).
6. Fix, then clear. After the repair, clear the codes to turn off the check engine light. Clearing also resets the emissions readiness monitors, so drive normally and check the readiness screen before any inspection. Permanent codes cannot be erased with a scan tool; they clear on their own once the car's self test passes.

Tip: you can also look up P0332 and other codes in the app's DTC search without connecting to a car. If your adapter will not connect, use Connection > Share connection log and email it to support. Many cheap ELM327 clones only handle basic engine OBD2, which is all you need for P0332.

When to see a mechanic

Get professional help if any of these apply:

• You hear pinging under load
• The engine overheats
• The code returns after wiring checks

If you are unsure, a qualified technician can confirm the cause with tests such as smoke testing, pressure testing or scope readings. Clearing a code does not repair the fault.

Related trouble codes

See all OBD2 trouble code guides

Related guides

Check engine light on: what to do · How to read an OBD2 code (P, B, C, U) · Stored, pending and permanent codes and freeze frame · OBD2 readiness monitors explained · OBD2 glossary · OBD2 by car brand