Question about 1999 Mazda Millenia
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Posted on Jan 02, 2017
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P0431 Warm up catalytic converter, bank 2 - efficiency below threshold
Possible causes: Catalytic converter, wiring, HO2S 2
increased HC emissions--no effect on engine performance unless caused by rich mixture.
To repair: Usually caused by worn out converter, but first verify fuel pressure regulator is not leaking fuel into it's vacuum port and that fuel pressure at the fuel rail is not above specification.
The car will run fine and there are no safety issues; however, before driving over anything that could ignite (for example, grass), make sure the catalytic converter is not glowing red.
If you have more questions, please let me know.
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