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Emissions and Exhaust Systems
Catalytic Converters
Oxygen Sensors

If your 1995 Geo Prism has failed emissions tests twice should you replace the oxygen sensor or catalytic converter?


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Wiki User
2015-07-15 19:15:21
2015-07-15 19:15:21

Depends on what failed on the emission test. HC? CO? NOx? Combination of these? Check to make sure all the vacuum lines are okay. No cracks or anything.

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The catalytic converter is most probably broken

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Catalyst efficiency below threshold, your catalytic converter may have failed.Catalyst efficiency below threshold, your catalytic converter may have failed.

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P0430 means:Catalyst system efficiency below thresholdFailed catalytic converter.P0430 means:Catalyst system efficiency below thresholdFailed catalytic converter.

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If there are no exhaust leaks or other codes, the catalytic converter has failed. You will need to replace it.


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