P0791 Audi Code - Intermediate Shaft Speed Sensor 'A' Circuit
Quick Answer
This sensor detects the rotation speed of the input turbine. Common causes include Faulty Intermediate Shat Speed Sensor 'A', Intermediate Shat Speed Sensor 'A' harness is open or shorted, Intermediate Shat Speed Sensor 'A' 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
- P0791 Audi indicates Intermediate Shaft Speed Sensor 'A' Circuit.
- Common causes
- Common causes include Faulty Intermediate Shat Speed Sensor 'A', Intermediate Shat Speed Sensor 'A' harness is open or shorted, Intermediate Shat Speed Sensor 'A' 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 P0791 Audi Description
What are the Possible Causes of the DTC P0791 Audi?
- Faulty Intermediate Shat Speed Sensor 'A'
- Intermediate Shat Speed Sensor 'A' harness is open or shorted
- Intermediate Shat Speed Sensor 'A' circuit poor electrical connection
How to Fix the DTC P0791 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 P0791 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 P0791 Audi Code
1. What does the OBDII code P0791 mean on an Audi?
Code P0791 indicates an issue with the Intermediate Shaft Speed Sensor 'A' Circuit, which monitors the rotational speed of the intermediate shaft in the transmission.
2. What are the common symptoms of code P0791 in an Audi?
Symptoms may include erratic or delayed shifting, poor fuel efficiency, transmission slipping, or the illumination of the check engine light.
3. What causes the P0791 code to appear on an Audi?
Common causes include a faulty intermediate shaft speed sensor, damaged wiring or connectors, transmission fluid issues, or a malfunctioning transmission control module (TCM).
4. Can driving with a P0791 code damage my Audi?
Yes, driving with this code can lead to further transmission damage or unsafe driving conditions due to improper shifting.
5. How do I diagnose the P0791 code in my Audi?
Start by inspecting the intermediate shaft speed sensor, wiring, and connectors for damage. Use a diagnostic scanner to monitor sensor readings and confirm the issue.
6. How do I fix the P0791 code in an Audi?
Repairs may involve replacing a faulty intermediate shaft speed sensor, repairing damaged wiring or connectors, flushing and replacing transmission fluid, or reprogramming the TCM.
7. How much does it cost to repair the P0791 code on an Audi?
Repair costs vary but typically range from $150 to $400, depending on whether the sensor, wiring, or other components need replacement.
8. Can a low transmission fluid level trigger the P0791 code?
Yes, low or contaminated transmission fluid can cause improper sensor readings and trigger this code.
9. Is it necessary to reset the check engine light after fixing code P0791?
Yes, after completing repairs, use an OBDII scanner to clear the code and verify that it does not return.
10. Can a failing transmission cause the P0791 code in an Audi?
Yes, internal transmission issues, such as worn components or a malfunctioning TCM, can lead to this code being stored.
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