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DTC P0455: EVAP System Leak Detected (Large Leak)

Fig 1: DTC P0455 Detection Condition & Possible Causes Chart
G01345297Courtesy of MAZDA MOTORS CORP.

Diagnostic Procedure 

Fig 2: DTC P0455 Diagnostic Procedure Chart (Step 1-5)
G01345298Courtesy of MAZDA MOTORS CORP.
Fig 3: DTC P0455 Diagnostic Procedure Chart (Step 6-16)
G01345299Courtesy of MAZDA MOTORS CORP.
Fig 4: DTC P0455 Diagnostic Procedure Chart (Step 17-18)
G01345300Courtesy of MAZDA MOTORS CORP.