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Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 23646
Experience:  Nissan factory trained and Certified Subaru Technician.
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2005 Altima 2.5L 82K miles. Service Engine Soon light is on.

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2005 Altima 2.5L 82K miles. Service Engine Soon light is on. Code: P0420 Text: Catalyst System Efficiency Below Threshold. What is this and how can I repair this? Thanks, Rick
HI there! This is a code for the converter. The only repair is normally replacing the converter. I would first contact the dealer however. Give them your VIN and see if there are any reacalls or bullitens that apply. Also, the converter is covered with a 8yr/80k mile warranty. If you are within these limits they will have to replace it free of charge. Hope this helps! Thanks
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