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Engine Warning Light

rutland32

By rutland32,
in Yaris & Yaris Cross Club

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rutland32 Apprentice

rutland32

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Hi

Can anybody help with an alarm code of P0420 which is described as:

Catalyst System Efficiency below Threshold.

How is this measyred? and which sensor or sensors measure this?

I have a Yaris 1.0GL 2000 reg.

Thanks

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Black Knight Proficient

Black Knight

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I'm not absolutely certain but it sounds like the O2 sensor that's getting upset. Doesn't necissarily mean it's the O2 sensor that's the problem though. Could be something like an Air Flow meter going or similar causing the O2 sensor to detect a fault

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