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Replace O2 sensor

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Old 05-09-02, 11:16 AM
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Question Replace O2 sensor

How often should O2 sensor be replace? Local auto parts store indicates replacing O2 sensor every 50M miles.
Old 05-09-02, 11:27 AM
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50m Miles?
Old 05-09-02, 11:33 AM
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50 million miles - wow, that's some industrial grade O2 sensor!

Seriously, about every other year or 50k miles is about right.&nbsp It's cheap when you start using generic O2 sensors with pigtail bare wires with a crimped connector.&nbsp It's cheaper than swapping spark plugs!



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Old 05-09-02, 11:42 AM
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Question Replace O2 sensor

If you don't replace O2 sensor every 50K miles, will gas mileage and performance suffer? If self-diagnosis checker (code 5) does not indicate problem with O2 sensor, replacement is unnecessary?
Old 05-09-02, 11:47 AM
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Too many variables...
If you keep the O2 sensor "clean", they can last over 100k miles.&nbsp The problem with O2 sensors nowadays is that most modern gasolines have additives that leave all kinds of nasty deposits on them - all that orange and pink crud on your old O2 sensor is deposits from gasoline additives.

When O2 sensor performance degrades, they become lazier to react.&nbsp This can hurt mileage in the long run.



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