P2577 OBD-II: Direct Ozone Reduction Catalyst Efficiency Below Threshold

OBD II Fault Code

• OBD II P2577

OBD-II Code Diagonostic Trouble Code is defined as a Direct Ozone Reduction Catalyst Efficiency Below Threshold

The Radiator on certain Super Low Emissions Vehicles (SULEV) has a special coating to convert smog in the surrounding air oxygen. The eac (Environmental Air Catalyst Sensor is hardwired to the Radiator of the vehicle. If the sensor fails, a new OE Radiator must be installed and coded to the engine computer (PCM). Failure of this sensor or installing an aftermarket radiator will result in code P2577 being set.

Common Problems That Trigger the P2577 Code

• EAC sensor coding to powertrain control module (DME)
• EAC sensor failure (part of radiator assembly)
• The radiator does not meet the manufacturer's requirements