# P0420 on the 2010 Mitsubishi Outlander

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

- [10170690](https://open.wenmarpro.com/bulletins/10170690), 2020-01-25: Some affected vehicles may display an illuminated MIL with DTC P0420: Warm Up Catalyst Efficiency Below Threshold, recorded in the ECM. An incorrect parameter in the judgment criteria may cause a false MIL \(mis\-detection of a fault when an abnormal condition is not present\). This TSB provides dealers with a procedure to reprogram the ECM with new software to correct the condition.