Catalytic converter

Hello,

There should just one catalytic converter on your vehicle. Here are a couple of links below explaining how to test and replace your vehicle's catalytic converters below:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
https://www.2carpros.com/articles/catalytic-converter-replacement

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

Hi, just wanted to jump in real quick. There was a bulletin for a software update to correct the P0420. Here is the bulletin. Chances are the original catalytic converter may have been okay.

2005 Honda Truck Element 4WD

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L4-2.4L

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Engine Controls - MIL ON/DTC P0420 Stored

Vehicle Powertrain Management Technical Service Bulletins Engine Controls - MIL ON/DTC P0420 Stored

ENGINE CONTROLS - MIL ON/DTC P0420 STORED

08-002

October 11, 2011

Applies To:
2005-06 Element - All Models With M/T

2005-06 Element:Â MILÂ Comes On With DTC P0420
(Supersedes 08-002, dated July 21, 2011, to revise the information marked by asterisks and black bars.)

REVISION SUMMARY

* Under WARRANTY CLAIM INFORMATION, the flat rate time was changed.*

SYMPTOM

The MIL is on, and DTC P0420 (catalyst system efficiency below threshold) is stored.

PROBABLE CAUSE

The ECM software misinterprets sensor inputs as a deteriorated catalytic converter.

CORRECTIVE ACTION

Update the ECM software, and check the three-way catalytic converter.

WARRANTY CLAIM INFORMATION