# P0420 on the 2017 Acura TLX

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

- [10164056](https://open.wenmarpro.com/bulletins/10164056), 2019-08-20: Service Bulletin \- The MIL comes on with DTC P0420 \(rear bank catalyst system efficiency below threshold \[bank 1\]\).
- [10152738](https://open.wenmarpro.com/bulletins/10152738), 2019-02-10: Dealer message \- American Honda Motor Co., Inc. \(AHM\) is investigating certain 2015\-2019 TLXs with a client complaint of the Malfunction Indicator Lamp \(MIL\) on with DTC P0420 \(Rear Bank Catalyst System Efficiency Below Threshold \[Bank 2\]\) and/or P0430 \(Front Bank Catalyst Sytem Efficiency Below Threshold \[Bank 2\]\) stored. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
- [10150286](https://open.wenmarpro.com/bulletins/10150286), 2018-12-07: Dealer message \- American Honda Motor Co., Inc. \(AHM\) is investigating certain 2015\-2019 TLXs with a client complaint of the Malfunction Indicator Lamp \(MIL\) on with DTC P0420 \(Rear Bank Catalyst System Efficiency Below Threshold \[Bank 2\]\) and/or P0430 \(Front Bank Catalyst Sytem Efficiency Below Threshold \[Bank 2\]\) stored. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
- [10150284](https://open.wenmarpro.com/bulletins/10150284), 2018-12-07: Dealer message \- American Honda Motor Co., Inc. \(AHM\) is investigating certain 2015\-2019 TLXs with a client complaint of the Malfunction Indicator Lamp \(MIL\) on with DTC P0420 \(Rear Bank Catalyst System Efficiency Below Threshold \[Bank 2\]\) and/or P0430 \(Front Bank Catalyst Sytem Efficiency Below Threshold \[Bank 2\]\) stored. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
- [10149656](https://open.wenmarpro.com/bulletins/10149656), 2018-12-03: Dealer message \- American Honda Motor Co., Inc. \(AHM\) is investigating certain 2015\-2019 TLXs with a client complaint of the Malfunction Indicator Lamp \(MIL\) on with DTC P0420 \(Rear Bank Catalyst System Efficiency Below Threshold \[Bank 2\]\) and/or P0430 \(Front Bank Catalyst Sytem Efficiency Below Threshold \[Bank 2\]\) stored. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
- [10146080](https://open.wenmarpro.com/bulletins/10146080), 2018-10-29: Dealer message \- American Honda Motor Co., Inc. \(AHM\) is investigating certain 2015\-2019 TLXs with a client complaint of the Malfunction Indicator Lamp \(MIL\) on with DTC P0420 \(Rear Bank Catalyst System Efficiency Below Threshold \[Bank 2\]\) and/or P0430 \(Front Bank Catalyst Sytem Efficiency Below Threshold \[Bank 2\]\) stored. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.