P0391 Audi Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2
Quick Answer
The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. Common causes include Faulty Camshaft Position 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
- P0391 Audi indicates Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2.
- Common causes
- Common causes include Faulty Camshaft Position 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.
Code P0391 Audi Description
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.
What are the Possible Causes of the DTC P0391 Audi?
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
How to Fix the DTC P0391 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0391 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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Frequently Asked Questions about P0391 Audi Code
1. What are the common symptoms of OBDII code P0391 in an Audi related to the Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2?
- Common symptoms include rough idling, engine stalling, poor acceleration, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P0391 in an Audi?
- Possible causes include a faulty camshaft position sensor, wiring issues, sensor connection problems, or a malfunctioning sensor circuit.
3. How do I diagnose the Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2 issue in my Audi?
- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the camshaft position sensor and its wiring, and performing a circuit test to identify the problem.
4. Can I still drive my Audi with OBDII code P0391 present?
- It is not recommended to drive your Audi with this code present, as it can lead to more severe engine problems and potential vehicle breakdowns.
5. How can I repair OBDII code P0391 in my Audi?
- Repair options may include replacing the camshaft position sensor, repairing damaged wiring or connections, or resetting the fault code after resolving the underlying issue.
6. Are there any DIY tips for fixing the Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2 problem in my Audi?
- While some basic troubleshooting steps can be done by DIY enthusiasts, it is often best to have a professional mechanic diagnose and repair the issue due to the complexity of the sensor circuit.
7. Will resetting the Check Engine Light clear OBDII code P0391 in my Audi?
- Resetting the Check Engine Light may temporarily clear the code, but it will likely reappear if the root cause of the issue is not addressed.
8. How much does it typically cost to repair OBDII code P0391 in an Audi?
- The cost of repair can vary depending on the specific issue and labor rates in your area, but it may range from $100 to $300 for parts and labor.
9. How long does it take to fix the Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2 problem in an Audi?
- The repair time can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to complete the repair.
10. Can OBDII code P0391 in an Audi cause permanent damage if left untreated?
- Ignoring this code can potentially lead to more serious engine problems, reduced performance, and increased risk of engine damage over time.
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