Mitsubishi Lancer 2008–2010 — technical service bulletin
Bulletin TSB-12-13-005 · NHTSA communication 10170690 · issued Nov 13, 2012
Technical service bulletin
communication type
Engine and Engine Cooling
component
2008–2010
model years
6
vehicle entries
Official summary
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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.