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California Emission Regulation Applicable Models

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Perform the following procedures, DTC P0421 is indicated only.
  1. Connect the WDS or equivalent to the DLC-2.
  2. Start the engine and warm it up to normal operating temperature.
  3. Turn off the engine.
  4. Verify that the engine compression is within the specification. (See COMPRESSION INSPECTION .)
    • If the compression pressure is not within the specification, repair or replace the malfunction part.
  5. Drive the vehicle for 10 min  at 65-96 km/h {40-60 mph}  to allow the front catalytic converter to reach operating temperature.
  6. Stop the vehicle and leave it in a safe space.
  7. Access Test ID 10:21:80 on the "Diagnostic Monitoring Test Result" function.
  8. Verify that the test result is within the specified indicated on the WDS or equivalent.
    • If it is not as specified, replace the front catalytic converter.
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