P420/P430 Codes, please help

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Old Jun 12, 2026 | 01:26 AM
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antoineu's Avatar
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P420/P430 Codes, please help

I’ve been getting P420 &P430 error code on my 2016 rdx.

I've attached the O2 sensor readings, you guys should please help me decode if I have an 02 sensor problem or a Cat problem

Bank 1 sensors 1&2
Bank 1 sensors 1&2
Bank 2 sensors 1 & 2
Bank 2 sensors 1 & 2
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Old Jun 12, 2026 | 07:59 AM
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The description does not include the full name of the sensor.
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Old Jun 12, 2026 | 04:17 PM
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From: Fargo, ND
Originally Posted by altair47
The description does not include the full name of the sensor.
I'm reasonably sure its full name is Kevin.

Hope this helps....
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Old Jun 12, 2026 | 04:35 PM
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Originally Posted by Kelsen
I'm reasonably sure its full name is Kevin.

Hope this helps....
😭I don’t know what other name he’s asking for
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Old Yesterday | 12:22 AM
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Originally Posted by antoineu
😭I don’t know what other name he’s asking for

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Old Yesterday | 12:25 AM
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Originally Posted by altair47
That is the downstream sensor 1 and 2. It’s a v6

The other with current signal is the upstream 1 and 2
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Old Yesterday | 12:54 AM
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This generation of the RDX comes only with a V6 engine. The readings could have been voltages from the upstream oxygen sensors. However, if you are seeing those kinds of graphs from the downstream oxygen sensors when the catalytic converters are fully warmed up, it means the converters are ready for the scrap heap.
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Old Yesterday | 01:21 AM
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Originally Posted by altair47
This generation of the RDX comes only with a V6 engine. The readings could have been voltages from the upstream oxygen sensors. However, if you are seeing those kinds of graphs from the downstream oxygen sensors when the catalytic converters are fully warmed up, it means the converters are ready for the scrap heap.
Will O2 spacers work for this, because my mpg is so low.. 19 on highway
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