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P0420 code and exhaust leak #5436065 05/22/20 05:11 PM
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hatt Offline OP
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F150 check engine light came on yesterday. Did a scan with Torque Pro and P0420 Bank 1 came up. Looking though whatever I can see on the app the 02 sensors seemed to be operating okay. The offending ratio was barely out of range. Heat gun showed hotter behind the cat but it was hard to get good readings in the driveway with the position of the cat and it was at idle since I didn't have an extra body. Getting under the other side I could hear what sounded like a small leak. Power and economy have not changed. How likely is the leak the culprit? Oddly, I also just got the truck back yesterday from having the speed sensor recall done, and had them look at an airbag issue. The computer was reset it appears. Could the software update have changed the acceptable range?


2013 F150 5.0, Delo 400 SD 15W-30, Wix 57502
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: P0420 code and exhaust leak [Re: hatt] #5436079 05/22/20 05:40 PM
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MParr Offline
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I would take it back to the dealer and explain your problem, as you have done here. They may have inadvertently done something to cause the problem.


2019 VW Tiguan SE 2.0 TSI Now: Castrol Pro OE LL IV 0W20 & OE VW
2020 F-150 STX Super Cab 2WD 2.7 Ecoboost. FF & OE filter
Re: P0420 code and exhaust leak [Re: hatt] #5436140 05/22/20 07:06 PM
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2010Civic Offline
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Reset the code and see if it comes back. If it does I'd consider a defowler for the o2 sensor. I did that on a 05 accord and the P0420 code has never returned.


2010 Honda Civic LX
Valvoline SynPower 5w-20 - Napa Gold oil filter
59,992 miles
Re: P0420 code and exhaust leak [Re: hatt] #5436147 05/22/20 07:14 PM
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Charlie2015 Offline
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There is a federally mandated 8 year / 80k mile warranty on converters.


1998 Honda Accord EX 2.3L Auto (Sold) 214k mi
2009 Scion tC Manual (Daily Driver) 170k mi - Valvoline Maxlife 5w30
Re: P0420 code and exhaust leak [Re: 2010Civic] #5436152 05/22/20 07:25 PM
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hatt Offline OP
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Originally Posted by 2010Civic
Reset the code and see if it comes back. If it does I'd consider a defowler for the o2 sensor. I did that on a 05 accord and the P0420 code has never returned.

I reset it last night. It came back.


2013 F150 5.0, Delo 400 SD 15W-30, Wix 57502
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: P0420 code and exhaust leak [Re: Charlie2015] #5436153 05/22/20 07:26 PM
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hatt Offline OP
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Originally Posted by Charlie2015
There is a federally mandated 8 year / 80k mile warranty on converters.

120K


2013 F150 5.0, Delo 400 SD 15W-30, Wix 57502
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: P0420 code and exhaust leak [Re: hatt] #5436265 05/22/20 09:38 PM
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clinebarger Online Content
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Probably a broken manifold bolt. A precatalyst exhaust leak can certainly cause low catalyst efficiency codes. It wouldn't be the first time a new calibration caused DTC's because different failure thresholds.

If you know someone with HP-Tuners.....This can be remedied with a few keystrokes wink


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: P0420 code and exhaust leak [Re: hatt] #5440048 05/27/20 10:39 AM
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hatt Offline OP
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The last few times I've driven the truck I've noticed the offending ratio was back in range. Light went off today on it's own. grin


2013 F150 5.0, Delo 400 SD 15W-30, Wix 57502
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: P0420 code and exhaust leak [Re: hatt] #5440147 05/27/20 01:15 PM
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Propflux01 Offline
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What is a defowler?


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: P0420 code and exhaust leak [Re: Propflux01] #5440150 05/27/20 01:19 PM
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bdcardinal Offline
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Originally Posted by Propflux01
What is a defowler?


https://www.amazon.com/Dorman-42002...mp;psc=1&refRID=0AXBXJEQKVREZM3M0JY6


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: P0420 code and exhaust leak [Re: bdcardinal] #5440509 05/27/20 09:41 PM
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Propflux01 Offline
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Originally Posted by bdcardinal
Originally Posted by Propflux01
What is a defowler?


https://www.amazon.com/Dorman-42002...mp;psc=1&refRID=0AXBXJEQKVREZM3M0JY6

Ah, yes, a converter cheater.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
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