# P0420 on the 2012 Audi S5

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 P0420

- [10130190](https://open.wenmarpro.com/bulletins/10130190), 2018-03-13: This bulletin provides information regarding a software update for DTC P042000 and/or P043000.
- [10128397](https://open.wenmarpro.com/bulletins/10128397), 2018-02-05: Supersedes Technical Service Bulletin Group 01 number 15\-26 dated June 30, 2015. The MIL is on. DTC P042000 and/or P043000 \(Catalyst system Bank 1/2, Efficiency below threshold\) is stored in the engine control module \(ECM\). The diagnostic limitations were too narrow.
- [10120746](https://open.wenmarpro.com/bulletins/10120746), 2017-10-25: The MIL is on. DTC P042000 and/or P043000 \(Catalyst system Bank 1/2, Efficiency below threshold\) is stored in the engine control module \(ECM\), J623 \(address word 01\). The diagnostic limitations were too narrow.
- [10118327](https://open.wenmarpro.com/bulletins/10118327), 2017-10-04: TSBs in this newsletters include the MIL on due to DTC P042000 and/or P043000 \(Catalyst system Bank 1/2, Efficiency below threshold\) being stored in the ECM. New ECM software implemented to correct the condition.
- [10118298](https://open.wenmarpro.com/bulletins/10118298), 2017-10-04: The MIL is on due to DTC P042000 and/or P043000 \(Catalyst system Bank 1/2, Efficiency below threshold\) being stored in the engine control module \(ECM\), J623 \(address word 01\). The diagnostic limitations were too narrow. New ECM software implemented to correct the condition.