When considering a Toyota Matrix, it's wise to be cautious about the model years affected by certain issues. One standout problem emerged in the 2009 model, particularly with its engine control modules (ECM). This issue could cause stalling or difficulty starting the vehicle, leading to potential safety concerns. Moreover, the 2003 model year had its share of transmission problems, including premature wear and shifting issues. While Toyota made efforts to address these issues in subsequent years, it's advisable to thoroughly research any specific model year you're interested in to ensure it doesn't fall within these problematic ranges. Additionally, a pre-purchase inspection by a trusted mechanic can provide valuable insight into the condition of the vehicle, helping you make a more informed decision.