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Honda O2 sensor

Tiny
GARROWJ
  • MEMBER
  • 1997 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
I have to repalce a bad O2 sensor, but when I went to check on the cost there was an upstream and downstream one. How do I know which one is bad or is it just normal to always change out both?
Sunday, January 16th, 2011 AT 4:35 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The trouble codes would indicate which O2 sensor is faulty.

Such components does not require both to be replaced at the same time but usually they have a life span and if one fails, there is a possibility the other might go off anytime. Personally I would not replace anything unless it is faulty.
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Sunday, January 16th, 2011 AT 5:03 PM

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