P0405 is a generic OBDII trouble code. It deals with the signal coming from the EGR system. Since it is a generic code, it has the same meaning for the Audi A5 as it would any other vehicle. The EGR system allows a certain amount of the A5’s exhaust to re-enter the combustion chamber, … Read more
P0431 is a standard OBDII trouble code, which means that it has the same meaning for the Audi A5 as it would any other vehicle. It is closely related to P0430 (which is one of the most popular OBDII codes). Warm Up Catalyst Efficiency → Below Threshold (Bank 2) When it’s the only trouble code … Read more
P0421 is a relatively rare OBDII trouble code. It’s generic, which means it has the same definition for the Audi A5 as it would any other vehicle. It is technically defined as “Warm Up Catalyst Efficiency → Below Threshold (Bank 1)”. In layman’s terms, it indicates that your Audi A5’s catalytic converter is not scrubbing pollutants efficiently … Read more
P0411 is a general OBDII trouble code, which means that it has the same meaning for the Audi A5 as it would any other car or truck. By definition, the code is letting you know that the ECM has detected incorrect flow in the secondary air injection system. P0411: Secondary Air Injection System → Incorrect … Read more
P0740 is one of the most common transmission trouble codes. It means that the A5‘s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit. P0740: Torque Converter Clutch Circuit Malfunction The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission … Read more
P0160 is a standard OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Audi A5. When a vehicle has P0160, the PCM/ECM is not detecting any activity from the sensor. It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is … Read more
P0118 is a common OBDII trouble code. It is a general code, which means that it’s going to have the same meaning for the Audi A5 as it would any other vehicle. P0118: Engine Coolant Temp Sensor Circuit → High Input This code is thrown when the resistance coming from the coolant temp sensor … Read more
P0410 is a generic OBDII trouble code. This means that it has the same meaning for the Audi A5 as it would any other vehicle. It is letting you know that there is an issue with the secondary air injection system. P0410: Secondary Air Injection System → Malfunction The secondary air injection system injects air … Read more
P0506 is a common OBDII trouble code. It is typically triggered when the engine idle speed is lower than the predetermined limit set by the manufacturer. It is a generic code, which means that it has the same meaning for the Audi A5 as it would any other vehicle. P0506 Symptoms: A5 Most … Read more
P0156 is an OBDII trouble code that occurs in the Audi A5. It is typically caused when the O2 Sensor voltage is not within its specified operating range. Bank two will be the side of the engine with cylinder 2 in the firing order. Sensor 2 is aft of the catalytic converter. … Read more