Description： \nThe oxygen sensor, located either upstream or downstream of the catalytic converter, is designed to monitor the air-fuel mixture under idle, moderate acceleration, and cruise conditions. Symptoms of a faulty or bad oxygen sensor include bad gas mileage, rough idle, reduced drivability, and an illuminated check-engine light. \nFitment： \n2008-2004 CHRYSLER CROSSFIRE V6-3.2 Downstream \n2004-2000 MERCEDES-BENZ SLK230 L4-2.3 Upstream \n2003-2001 MERCEDES-BENZ ML320 V6-3.2 Downstream \n2005-2003 MERCEDES-BENZ ML350 V6-3.7 Downstream \n2001 MERCEDES-BENZ ML430 V8-4.3 Downstream \n2004-2002 MERCEDES-BENZ ML500 V8-5.0 Downstream
