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1st - 5th Generation Civic 1973 - 1995 In the years from 1973 to 1995 Honda released its 1-5th Generation Civics.
1st Gen 1972 - July 1979
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3rd Gen 1984 - 1987
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Code 1 O2 Sensor / D15b Vtec

 
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Old 10-23-2010
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Code 1 O2 Sensor / D15b Vtec
Recently purchased 88 Wagovan. Dropped in D15b Vtec. Had issued passing enissions. Found Code 1 which was O2 sensor, replaced O2 sensor and passed emissions. On way home from inspection and engine through code 1 again. WTF is going on? This is driving me crazy.think the engine is running RICH. What else causes the engine to run rich. Bad injector's? Bad TPS.

Please help.
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Old 10-23-2010
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Re: Code 1 O2 Sensor / D15b Vtec
Take off your heat shield and look for cracks on the exhaust manifold. Could be a vacuum leak too.

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