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Constant check engine light on

Old 06-03-2019, 01:17 PM
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Troublesome
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Default Constant check engine light on

Have a 97 Honda Civic DX, check engine light came on last week had it check and it code as the secondary 02 sensor so I replace both sensors and now everytime I turn on my AC the light comes on again with the same code, need some advice to try to understand which direction to go next
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Old 06-25-2019, 10:44 AM
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ChrisS
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Default Check engine light

Check the grounds are clean and tight (body, transmission, thermostat housing, valve cover). A bad ground can cause sensor readings to go haywire. All electricity flows from positive battery terminal back to ground (negative battery terminal)
If the negative battery cable looks bad or damaged in any way, replace it with a new honda factory negative battery cable. (Neg battery terminal clamp, body ground, transmission ground).
Check battery terminals are clean and tight
Check wiring connections are clean (at the sensor and wiring harness to ECU). Use contact cleaner to remove any corrosion/dirt.

take care,
ChrisS
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