AutoCodes – Volkswagen – P1321 Volkswagen

P1321 Volkswagen Code - Knock Sensor 3 Signal Too Low

Quick Answer

The Engine Control Module (ECM) monitors the Knock Sensor 3 Signal. Common causes include Faulty Knock Sensor 3, Knock Sensor 3 harness is open or shorted, Knock Sensor 3 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1321 Volkswagen indicates Knock Sensor 3 Signal Too Low.
Common causes: Common causes include Faulty Knock Sensor 3, Knock Sensor 3 harness is open or shorted, Knock Sensor 3 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 3,888

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1321 Volkswagen Description

The Engine Control Module (ECM) monitors the Knock Sensor 3 Signal. The ECM sets the Diagnostic Trouble Code (DTC) when the Knock Sensor 3 Signal is not to factory specifications.

OBDII Code P1321 Volkswagen - Knock Sensor 3 Signal Too Low - AutoCodes.com — P1321 Volkswagen Code - Knock Sensor 3 Signal Too Low

What does this mean?

What are the Possible Causes of the DTC P1321 Volkswagen?

Faulty Knock Sensor 3
Knock Sensor 3 harness is open or shorted
Knock Sensor 3 circuit poor electrical connection

How to Fix the DTC P1321 Volkswagen?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1321 Volkswagen code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.