Indication of diagnostic trouble codes P0455, P0442, and P0456
Symptom: Diagnostic trouble code P0455, P0442, or P0456 is indicated
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Indication of diagnostic trouble codes P0455, P0442, and P0456
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Fault symptoms
Diagnostic trouble code P0455, P0442, or P0456 is indicated
Conditions
A large number of replaced purge valves and filler caps have proven to be free from defects. This is due to incorrectly installed, insufficiently tightened or incorrect filler caps.
Diagnostic procedure
Before testing the EVAP system, check whether the filler cap is broken. Check also that the filler cap is correctly installed.
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1.
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If the filler cap is incorrectly installed, one of the above diagnostic trouble codes may be indicated.
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2.
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If the EVAP system is tested and no leakage is found, do NOT replace the purge valve or filler cap. Instead, clear the diagnostic trouble code, and inform the client about the importance of tightening the filler cap until a noticeable click is heard after filling up.
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