Manufacturer Part Number: Denso (Part Number: 234-5033) Installation Location: Front (Upstream / Before the catalytic converter). Compatible Cars: Mazda 6: Models from 2009 to 2013 (2.5L engine). Condition: New (High-quality aftermarket replacement / or equivalent to original specifications). Features: Contributes to fuel consumption adjustment, performance improvement, and turning off the Check Engine light related to oxygen sensor codes.