98 honda civic check engine light on...

Joined
Aug 20, 2008
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louisiana
hey guys, my car threw a code yesterday and my scanner read it as P0135 ( heater circuit of the 02 sensor)! is it a must that i get this checked out right away, or can i just keep rolling..?
 
Joined
Apr 29, 2008
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Sudbury, ON, Canada
That is correct. Until the element is hot (either from the heater, or the engine itself), you're likely running in open-loop mode (i.e. squirt as much gas in the cylinder as possible until the ECU knows the engine is safe).
 
Joined
Sep 5, 2006
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Chicago Area
That O2 sensor will not read right unless it is hot. The heater inside helps with a quicker readings. After you drive a while it is not necessary, but it will still throw a code. In Louisiana Summertime, you have time on your side to leisurely get another one. Afterwards, clear the codes.
 
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Joined
May 7, 2004
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Nokesville, VA
The last O2 sensor I replaced in a Civic for a blown heater (seems to be a common problem), I used a Walker from oxygensensors.com which cost $60 and it worked fine.
 

kenwin30

Thread starter
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Aug 20, 2008
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louisiana
just checked my mpg's with the 02 sensor out, and i prob got 6-7 mpg less than i did before it went out
 
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Mar 2, 2005
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Austin, TX
Cost for a Honda sensor is about $200. Aftermarket, particularly if you do it yourself is less than half that.
 
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Sep 23, 2007
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 Originally Posted By: kenwin30
i read where some guy said it might decrease my mpg's and thats about it
The excess fuel in the exhaust could shorten the life of the catalytic converter.
 
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Sep 12, 2004
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Central Florida
I bought a new Denso sensor online for our 1998 Civic EX and it was approx $75 and it was the exact sensor.... NOT a universal O2 sensor that just happened to fit. The car still gets 40+ MPG after 250K miles. BTW, make sure you check the exhaust manifold for cracks cause this is a well known problem on the 1996-2000 Civic.
 
Joined
May 11, 2004
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St. Paul, MN
Good advice here so far, buy a name brand O2 sensor for plug and play easiness. Heater elements going out on Honda 02 sensors is a common problem.
 
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