# P040B on the 2012 Audi Q7

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P040B

- [10228396](https://open.wenmarpro.com/bulletins/10228396), 2023-01-03: The quality of the auxiliary exhaust gas recirculation \(EGR\) cooler modules manufactured within a certain timeframe may be inadequate. The vacuum actuator diaphragm may have leaks. A faulty auxiliary EGR cooler will trigger a P310E fault. Faulty operation of the auxiliary EGR cooler can also trigger the P040B fault, but there is no issue with the temperature sensor.
- [10225075](https://open.wenmarpro.com/bulletins/10225075), 2022-10-31: The quality of the auxiliary exhaust gas recirculation \(EGR\) cooler modules manufactured within a certain timeframe may be inadequate. The vacuum actuator diaphragm may have leaks. A faulty auxiliary EGR cooler will trigger a P310E fault. Faulty operation of the auxiliary EGR cooler can also trigger the P040B fault, but there is no issue with the temperature sensor.
- [10222048](https://open.wenmarpro.com/bulletins/10222048), 2022-09-26: The quality of the auxiliary exhaust gas recirculation \(EGR\) cooler modules manufactured within a certain timeframe may be inadequate. The vacuum actuator diaphragm may have leaks. A faulty auxiliary EGR cooler will trigger a P310E fault. Faulty operation of the auxiliary EGR cooler can also trigger the P040B fault, but there is no issue with the temperature sensor.
- [10125577](https://open.wenmarpro.com/bulletins/10125577), 2017-12-14: Supersedes Technical Service Bulletin Group 26 number 12\-13 dated August 31, 2012. The MIL is on. DTCs are stored in the ECM. The quality of the auxiliary exhaust gas recirculation \(EGR\) cooler modules manufactured within a certain timeframe may be inadequate. The vacuum actuator diaphragm may have leaks. A faulty auxiliary EGR cooler will trigger a P310E fault. Faulty operation of the auxiliary EGR cooler can also trigger the P040B fault, but there is no issue with the temperature sensor.