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Code po 420

Old 12-31-2017, 02:05 PM
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Join Date: Dec 2017
Posts: 1
Post Code po 420

Hi just joined today! Great site. I have an 03 Camry with the 2.4 L4, automatic trans. I live in Wisconsin and it's only single digits for high temps the last couple weeks. Two days ago the code po 420 came up on my scan tool. The Freeze frame shows fuel system 2 CL-Fault. Any thoughts? My daughter drives the car so getting any real answers is tough( teenagers you know) . The ff also shows Calcload % 58.04. Thank you for your time
Old 12-31-2017, 04:01 PM
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Join Date: Jan 2008
Location: PTW
Posts: 11,678

Odds are its the converter. However check the items in the link below first.

The Misleading Nature of the PO42O Code - Eastern Manufacturing
Old 01-14-2018, 12:43 PM
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Join Date: Jan 2018
Location: South
Posts: 3

Before you spend some big dollars change out the Air/Fuel O2 Oxygen sensor upstream. Only costs $55 and is very simple to do since it's the one right in front when you open the hood.
Old 01-14-2018, 11:19 PM
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Join Date: Oct 2015
Posts: 280

I understand, its hard to work out there. I'm in Illinois. Never seen so much cold weather.

Start simple

Do nothing if it does not affect performance. No emissions testing.
Check everything plugs, air filter, gas filter, etc. Is everything well maintained.

Reset code and go from there.

Check idle air control valve. Mine was filthy. Use CRC 05078 Throttle Body & Air‑Intake. Google on how to. Fixed many code issues on my vehicles.
Hope that helps.
Old 01-14-2018, 11:23 PM
Senior Member
Join Date: Oct 2015
Posts: 280

I wanted to add one more thing . Just because you have a code does not always bring you to the root cause. Codes are a guide not necessarily a solution. My opinion.
Old 01-23-2018, 08:38 AM
Junior Member
Join Date: Mar 2012
Posts: 9

I got that code on my 02. The mechanic said try putting a full bottle of Sea Foam in the tank and fill it up with 92 octane and give that a try. He cleared the codes and off we went. No code showing up for a year. Two weeks ago it showed up again and I did the same thing. No more codes.

He felt it could be some bad gas and a little more cranking in the winter time (richer mixture) not completely getting burnt. He said all it will cost is $8 and to give it a try. Can't hurt. Well, we saved a bunch of $$$ and thanked the mechanic. Give it a try.
Old 01-23-2018, 12:00 PM
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Join Date: Jan 2008
Location: PTW
Posts: 11,678

Thanks for the information!
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