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Engine - 3.9L: Adjustments Ford Thunderbird XI

Emission Calibration Label

Note. The engine codes and the calibration numbers must be used when making inquiries or ordering parts.

The emission calibration number label is located on the LH side door or LH door post pillar. It identifies

  1. the engine calibration number
  2. the engine code number
  3. the revision level

These numbers are used to determine if parts are unique to specific engines.