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6th generation of Honda's popular compact car.

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Engine code for Honda civic

What dose engine code d0135 mean for 1999 Honda Civic

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2 Answers

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Joeb, never seen a D0135, only a P0135 which means "Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)" To repair that I would start by replacing the oxygen sensor as well as checking the wiring harness to make sure it is not damaged.

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I had quite an issue with my 1998 Honda Civic HX, told me the oxygen sensor was lazy, even for a new sensor. Turned out that the ECM needed more recent firmware, but an update was not possible. Ended up getting a replacement ECM which cured the problem.

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Joeb will be eternally grateful.
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