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Old 09-11-2011, 11:13 AM
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bennyb53 bennyb53 is offline
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2019 Sentra
2002 Altima
 
Join Date: Jan 2011
Location: Hawaii
Posts: 2,105
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The 0420 is not a O2 sensor code. I just replaced my rear (post-cat) with a code 1147.

Many owners refer to this as the dreaded code. Its your pre-cat. Have it inspected and consult your manual for warranty info. IDK how many miles she's got.
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