Ford Mondeo Oxygen Sensor DS7A-9G444-CB Replaces DY1268 0258030065

Ford Mondeo oxygen sensor DS7A-9G444-CB (compatible DY1268, 0258030065) installed near the exhaust catalyst; monitors exhaust oxygen content and feeds ECU to adjust air-fuel ratio for improved combustion efficiency. Direct OE replacement; fits many Mondeo models; installation difficulty medium; estimated 30-45 minutes; protect threads during removal. If idle is unstable, fuel consumption rises, acceleration is weak, or check engine light is on, oxygen sensor performance has declined; replace timely.