Cylinder 1 Knock Control Limit Attained
2002-2004 Audi A6 3.0L V6
Description
The ECU detected that the knock control system has retarded ignition timing on Cylinder 1 to its maximum limit. Persistent knock requires excessive timing retard that exceeds the system capability.
Symptoms
- Check Engine Light
- Loss of power
- Engine pinging or knocking audible
- Reduced fuel economy
Common Causes
- Low-octane fuel
- Carbon buildup on piston or valves
- Faulty knock sensor
- Overheating condition
- Incorrect ignition timing
Diagnostic Steps
- Switch to higher-octane fuel and clear codes
- Check for engine overheating
- Test knock sensor signal
- Inspect for carbon buildup
- Check ignition timing base setting
Repair Notes
Use the correct octane fuel; perform carbon cleaning if buildup is present.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1325 on Other Vehicles
Common Questions
What does code P1325 mean on a 2002-2004 Audi A6?
P1325 stands for "Cylinder 1 Knock Control Limit Attained". The ECU detected that the knock control system has retarded ignition timing on Cylinder 1 to its maximum limit. Persistent knock requires excessive timing retard that exceeds the system capability.
What are the symptoms of P1325 on a Audi A6?
Common symptoms of P1325 include: Check Engine Light, Loss of power, Engine pinging or knocking audible, Reduced fuel economy.
What causes P1325 on a 2002-2004 Audi A6?
Common causes of P1325 include: Low-octane fuel, Carbon buildup on piston or valves, Faulty knock sensor, Overheating condition, Incorrect ignition timing.