P3991 Audi Fault Code
If you want to know how to repair P3991 OBD 2 code, it is necessary to find out what type of fault it is. The reason for this is that each type of fault needs different repair steps.
Meaning of Audi P3991 OBD/2 ErrorP3991 Code Check :
P3991 OBD 2 code troubleshooting is a process of resolving the problem with the car engine by inspecting the error codes and checking for any specific issues.
| P | Powertrain (P) Code |
| 3 | Throttle/Pedal Position Sensor/Switch A Circuit Intermittent |
| 9 | Exhaust Gas Recirculation System Valve 1 |
| 9 | A/C System High Pressure High Temperature |
| 1 | Water Pump Mechanical Defect Detected |
Common P3991 Error :
Because many things can trigger the error, finding the root cause can be tricky. This often makes repairing code P3991 a long and arduous task. Other times, more than one problem can trigger this code.
It's advisable to leave this one to the professionals. In most cases, fixing code P3991 does not cost a lot to repair. Once the code P3991 is repaired, your car will run better, have more power, and get better fuel mileage.