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Old 09-21-2016, 03:29 PM   #1
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Unhappy P0420 code on 2013 Focus TI with 35k Miles

Hi everyone, I've been getting the P0420 code on my focus ti with 35k miles. I have replaced the rear O2 sensor and the code is still popping up, but I've never heard of the cat failing with such low mileage? Could the upstream O2 sensor have anything to do with this code?

I checked the my ford website and it says my warranty has expired, is there an extension on emissions stuff like this?

Of course all this has to happen right before I'm due for a smog check lol.

Any advice is welcomed!


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Old 09-21-2016, 04:10 PM   #2
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Honestly have no clue why you want to mess with it, unless it's a salvage titled car without most warranties.

Could be out of the bumper to bumper warranty by time depending on purchase date but the emissions warranty is still good for a LONG time on major components like the CAT.

Power train is good to 5/60 as well for other items, and there are others that don't apply here.

You MAY find out they want to do a purge valve replacement first, there is a possible false P420 for issues there. Or they may not - crap shoot.

The expensive piece is covered, and some have seen early CAT failures.
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Old 03-01-2017, 08:40 PM   #3
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Sorry to revive an old thread. I continue to pull the P0420 code even after replacing the Purge Valve which was a simple $40 fix. It worked for a bit, but my OBD-II scanner shows a "permanent" code of P0420. Last thing I can think of is either an exhaust leak or a bad O2 sensor. Any other ideas?
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Old 03-01-2017, 08:49 PM   #4
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Check the last post - sure you are NOT still in the Emissions warranty period? It's longer than the power train one....
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Old 03-01-2017, 08:53 PM   #5
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0420 is Catalyst below efficiency has nothing to do with the purge valve

0420 is "USUALLY" the front 02 sensor not reading correct via a bad heater.. the rear 02 sensor is just replying that somethings not working right.. its rare a rear goes its usually the front bank that goes bad...

My Jaguar had a 0420 and i replaced both front 02's and the code went away on its own when i tested the 02 i found that both heaters were totally dead.
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Old 03-01-2017, 08:57 PM   #6
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Quote:
Originally Posted by De_Oro View Post
Sorry to revive an old thread. I continue to pull the P0420 code even after replacing the Purge Valve which was a simple $40 fix. It worked for a bit, but my OBD-II scanner shows a "permanent" code of P0420. Last thing I can think of is either an exhaust leak or a bad O2 sensor. Any other ideas?
Yeah, real-time monitoring of the two O2 sensors is one step in diagnosis of P0420. Then add temperature test of cat input verses output. No need to add further detail because this video will explain it much better->

https://www.youtube.com/watch?v=9VZ5K8n5jj0
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Old 03-01-2017, 09:01 PM   #7
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Mynx - it's a known false code on the MkIII to get a P0420 associated with a purge valve issue.

So much so that Dealers will NOT replace a CAT under warranty without trying the purge valve replacement first.
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Old 03-01-2017, 09:05 PM   #8
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Quote:
Originally Posted by sailor View Post
Mynx - it's a known false code on the MkIII to get a P0420 associated with a purge valve issue.

So much so that Dealers will NOT replace a CAT under warranty without trying the purge valve replacement first.
i am so effing glad i dont own a mkIII... between the codes caused by things that have nothing to do with other things to imploding gas tanks no thanks if i ever get a MKIII i will be stripping out all the stupid computer controlled crap.. replacing the gas tank to a plastic and running with a modified filler cap :P we used to complain about stupid things in the earlier focus's the 2012 and up are just riddled with stupid issues.

also its even more rare that a 0420 ends up being the cat itself..

but again i dont own a MKIII and im sitting here glad i don't

i'll take my 500,000 mile 03 Jaguar over a brand new focus anyways even tho ford did build the jag off the Mondeo layout
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Old 03-02-2017, 05:27 AM   #9
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You really should get O2 heater codes with the heaters not working. I said 'should', no guarantee on anything.

Watch the rear switching as compared to front and it becomes pretty obvious what the issue could be.

Sticking vent to suck in tank area to then make the carbon canister flood as well as the evap vent to engine when the above fuel air space goes way down, can run really rich then to mess up sensor outputs.

I would think that would show in engine performance though.
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Last edited by amc49; 03-03-2017 at 01:12 AM.
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Old 03-02-2017, 10:08 PM   #10
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Let me step in here....

Saying that a faulty canister purge valve can't cause a P0420 is false. When the purge valve fails, it sticks open. This results in 1.) excessive fuel vapor entering the engine. 2.) increased vacuum on the fuel tank, resulting in the fuel tank collapsing. 3,) Liquid fuel being drawn into the charcoal canister. The introduction of excessive fuel vapor can cause the catalytic converter to fail prematurely.

Quote:
Originally Posted by ArcticMynx View Post
also its even more rare that a 0420 ends up being the cat itself..
On the 2012 and up Focus, more often than not, P0420 results in the replacement of the catalytic converter. The catalytic converter failure is usually caused by an owner that ignores the check engine light for too long.

The catalytic converter, by federal mandate, has a 10 year/100,000 mile warranty....whichever occurs first.
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Last edited by sykozis; 03-02-2017 at 10:12 PM.
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