Some 2008-10 Chrysler Sebring and Dodge Avenger models with 2.4-liter engines, four-speed automatics and build dates prior to June 8, 2010, may illuminate the check engine light and store trouble code P2270 (post-cat oxygen sensor biased lean) in PCM memory.
Chrysler said if there are no drivability issues associated with the P2270 and there are no other codes stored, it's likely bogus and caused by software anomalies in the PCM.
Reprogramming the module with updated software is the only surefire fix. Check with a dealer for the specifics of the flash.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].