P0523 is a standard OBD2 trouble code that can occur in the Audi A4. In layman’s terms, it indicates the signal from the oil pressure sensor is higher than its normal operating range (in terms of voltage). P0523 is generic (it has the same definition for all vehicles), repair steps will depend on your A4’s … Read more
P0705 is a very common transmission-related trouble code that can occur in the Audi A4. In layman’s terms, it means that your A4 can’t tell what gear you’ve selected, which can have some real consequences on how it drives. It’s most likely caused by a bad Transmission Range Sensor (TRS), but there are other causes … Read more
Daytime running lights (or DRL) are specialized lights that come on when your Audi A4’s regular headlights are turned off. Their purpose is to make it easier for other drivers to see you, theoretically decreasing the odds of getting into an accident. If your A4’s DRL warning light is on, the powertrain control module (commonly … Read more
P2271 is a generic DTC trouble code that can affect the Audi A4. It indicates that the oxygen sensor located on bank 1 in the second position is continuously sending voltage with a value that is too rich. There are oxygen sensors on both sides of the catalytic converter. The “upstream” one is used for … Read more
P2279 is a generic OBD-II code. It indicates there is a vacuum leak coming from your Audi A4’s air intake system. While P2279 is a generic code (it has the same definition for the A4 as it would any other vehicle made after 1996), repair steps will vary based on model year and engine. The … Read more
P0116 indicates that your Audi A4’s engine coolant temperature sensor is sending a signal to the PCM (powertrain control module) that is outside of its normal operating range (in terms of voltage). While P0116 is a generic OBD2 code (it has the same definition for any car or truck), it has the same basic causes … Read more
P0117 is a generic OBD2 code. It indicates that your Audi A4’s PCM (powertrain control module) has detected the signal coming from the engine coolant temp (ECT) sensor has a voltage level below its normal operating range. With the ECT sensor, as the voltage level drops, it will appear that your A4 is overheating. While … Read more
P0743 is a generic OBD2 code that can occur in the Audi A4. It indicates that your ECU/TCM has found an issue with the torque converter clutch solenoid. It is a generic code (meaning it has the same definition for all cars and trucks). Repair steps are going to vary depending on your A4’s model … Read more
P0776 is a generic OBD2 code that can occur in Audi A4’s equipped with an automatic transmission. This code indicates that the pressure control solenoid “B” inside your A4’s transmission is having a performance issue, or is stuck in the off position. P0776 Definition: Pressure Control Solenoid “B” – Performance/Stuck Here’s the definition of P0776, … Read more
P0400 is a standard code that indicates your Audi A4’s EGR system is not working. The good news is that this code is not a breakdown risk and should not affect how your A4 runs (assuming it’s the ONLY code). P0400 is a generic code, which means it has the same definition for the A4 … Read more