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Oxygen Sensor, PO420A

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#1

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11-11-2004, 09:46 AM

jjolt

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Oxygen Sensor, PO420A

The code PO420A came up on a OBD-II computer scanner. From what I understand, it's an oxygen sensor. However, there are two. Which one is it and where is it located?

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#2

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11-11-2004, 11:23 AM

richtazz

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Re: Oxygen Sensor, PO420A

po420a is "catalyst system efficiency below threshhold" That sounds like a bad converter to me. The oxygen sensor has nothing to do with catalyst efficiency.

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