AutoCodes – Audi – P1391 Audi

P1391 Audi Code - Camshaft Position Sensor Bank 2 Short To Ground

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when the output from the Camshaft Position Sensor is not as expected or missing. Common causes include Faulty Camshaft Position (CMP) Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1391 Audi indicates Camshaft Position Sensor Bank 2 Short To Ground.
Common causes: Common causes include Faulty Camshaft Position (CMP) Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,775

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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Table of contents Created and updated by William Orellana on Nov 12, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1391 Audi Description

This fault code is stored in the Engine Control Module (ECM) when the output from the Camshaft Position Sensor is not as expected or missing. The ECM uses information from the Crankshaft Position Sensor to validate the signal from the Camshaft Position Sensor. The phonic wheel for the camshaft position should also be inspected as incorrect fitment or damage can affect the signal. Incorrect valve timing can also cause this fault. If the vehicle is fitted with variable valve timing the operation of this system should also be tested. A good quality oil supply is vital for the correct operation of variable valve timing. The lubrication system should also be inspected when this fault occurs.

OBDII Code P1391 Audi - Camshaft Position Sensor Bank 2 Short To Ground - AutoCodes.com — P1391 Audi Code - Camshaft Position Sensor Bank 2 Short To Ground

What does this mean?

What are the Possible Causes of the DTC P1391 Audi?

Faulty Camshaft Position (CMP) Sensor
Camshaft Position Sensor harness is open or shorted
Camshaft Position Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1391 Audi?

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 P1391 Audi 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.

Frequently Asked Questions about P1391 Audi Code

What does OBD-II code P1391 mean for an Audi?

Code P1391 indicates a problem with the camshaft position sensor on Bank 2, specifically a short to ground in the electrical circuit.

What are the common symptoms of code P1391?

Symptoms may include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and sometimes difficulty starting the engine.

What causes code P1391 on an Audi?

Common causes include a damaged or faulty camshaft position sensor, wiring issues such as frayed or shorted wires, or a problem with the sensorâ€™s connector.

Can driving with code P1391 damage my Audi?

Driving with this code can lead to performance issues and, over time, potentially cause damage to the engine due to improper timing.

How do I diagnose code P1391?

Start by inspecting the camshaft position sensor and its wiring for visible damage. Use a multimeter to check for shorts or open circuits in the wiring harness.

How do I fix code P1391 on an Audi?

Repairs may involve replacing the camshaft position sensor, repairing or replacing damaged wiring, or cleaning and resecuring electrical connectors.

Can a weak battery cause code P1391?

While unlikely, electrical issues such as a weak battery or poor ground connections can indirectly contribute to sensor-related faults.

How much does it cost to repair code P1391?

Costs vary depending on the issue, but replacing a camshaft position sensor typically ranges from $100 to $300, including parts and labor.

Do I need special tools to fix code P1391?

Basic tools like a multimeter, socket set, and wiring repair tools are usually sufficient. Some repairs may require an OBD-II scanner for diagnostics.

Can code P1391 reappear after repairs?

Yes, if underlying issues like damaged wiring or poor connections are not fully addressed, the code may reappear.