What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » P1332

Code P1332

Symptoms

• Check Engine Light is on

• Poor engine performance

• Increased fuel consumption

Common Causes

• Faulty knock sensor

• Damaged wiring or connectors

• ECM malfunction

Glossary

ECM: Engine Control Module

OBD-II: On-Board Diagnostics II

Related Codes

• P0325

• P0330

Official description

Knock/Combustion Vibration Sensor 4 Circuit Low

Laymans terms

This code means that the car's computer has detected a problem with one of the sensors that listens for engine knocking sounds. It's like the car's ear isn't working properly.

Explanation

The engine control module (ECM) has detected a low voltage signal from the knock sensor circuit for sensor 4, indicating a potential issue with the sensor or its wiring.

Technical description

The knock sensor is responsible for detecting engine knocking, a condition where fuel burns unevenly in the engine's cylinders. This sensor sends a voltage signal to the ECM. If the voltage is too low, it suggests a problem with the sensor, its wiring, or the ECM itself.

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the knock sensor and its wiring for damage.

• Test the sensor's voltage output with a multimeter.

Repair procedures

• Replace the knock sensor if faulty.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the ECM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Socket set

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Honda Accord

• Ford F-150

Preventive measures

• Regularly inspect engine wiring.

• Use high-quality fuel.

• Perform scheduled maintenance.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the Check Engine Light.

• Consult a professional mechanic if unsure.

• Avoid driving aggressively until the issue is fixed.

Warranty information

Check with your vehicle manufacturer for warranty coverage on sensors.

Historical data

This code has been associated with sensor failure due to prolonged exposure to engine heat.

Urgency level

Moderate – Address the issue soon to prevent potential engine damage.

Legal and safety notice

Driving with an unresolved knock sensor issue can lead to engine damage and increased emissions.

Testing conditions

• Engine at operating temperature

• Vehicle stationary

Component location

The knock sensor is typically located on the engine block, cylinder head, or intake manifold.

FAQs

Q: Can I drive with a P1332 code?
A: It's not recommended to drive for long periods with this code, as it may lead to engine damage.

Q: How do I reset the Check Engine Light after repairs?
A: You can use an OBD-II scanner to clear the code after repairs are completed.

Last updated: Oct 7, 2025 • Source: internal database

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