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If your Honda Ridgeline failed the emissions test due to high NOX, the EGR Valve is most likely the issue. If your Honda is running rough or has poor fuel mileage, replace the Ridgeline EGR Valve and gasket.
The Honda Ridgeline Oxygen sensor is a critical part of the emmision control system and should be replaced as soon as it fails. Make sure to check the Honda Ridgeline diagnosics codes for proper replacement of the O2 Sensor.