Car Problem Reports

Honda Civic PCM Software Update to Correct False Oxygen Sensor Code

Honda Civic Problem
18 Reports
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Model Years Affected: 2004, 2005

Average Mileage: 116,081 mi (28,000 mi - 190,000 mi)


On certain models the Powertrain Control Module (PCM) can misinterpret the secondary oxygen sensor data and set a false Check Engine Light. A software update from Honda is needed for this issue.

  • Visitor, , 123,000 mi

    P0141 code, replaced sensors multiple times, checked fuses, wiring, measured O2 sensors w/ meter,computer o.k., just bought another sensor from dealer (no warranty...go honda!) going to replace sensor in cat. again. If it doesn't fix problem car is going for a downhill drive off of a short pier!!! NEVER OWN A HONDA AGAIN!

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  • Visitor, , 154,950 mi

    Check engine light reading 0s2 circuit

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  • Visitor, , 112,876 mi

    Same problem, it is not yet fixed.

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  • Visitor, , 105,000 mi

    My 2005 Honda Civic EX intermittently threw a p0135 code saying that the a/f sensor one was either faulty or something was wrong with the heater circuit. It also threw a p0141 code for 02 sensor 2. I replaced both sensors, but the MIL light comes on despite resetting the battery several times. Both sensors were brand new and OEM quality sure fit. I'm taking it to a local shop to have them do a detailed reading to see if it's not something else electrical or if it possibly the PCM.

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  • Visitor, , 74,000 mi

    The MIL is on. Codes P0135 and P0141 are reported for each sensor. The sensors have been replaced. The PCM has been updated. The fuse box has been replaced. The problem persists.

    Honda isolated the problem to no communications signal at fuse 4 in the cabin fuse box and recommended replacing the fuse box. That was done along with all their other suggestions. All that has been accomplished is that Honda has drained more money out of my economy.

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  • Visitor, , 28,000 mi

    replaced the oxygen sensor for 530 dollars

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