98 honda civic check engine light on...

Messages
274
Location
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..?
 
Messages
1,967
Location
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).
 
Messages
19,479
Location
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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Messages
10,597
Location
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.
 
Messages
8,598
Location
Florida
 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.
 
Messages
24,412
Location
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.
 
Messages
1,562
Location
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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