Should I fix it?

"404usernotfound" (404usernotfound) 02/03/2015 at 22:00 • Filed to: None

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This is the code that My 03' Infiniti i35 Just threw. P0420 could mean that the O2 sensor is bad, the Catalytic converter is bad, or that something is wrong with my exhaust system. Now, I had the same code come up on my old Volvo s40, and it turned out to be the O2 sensor. Now, nothing feels wrong with the car, mileage hasn't dropped, and it doesn't sound different, so can I just leave it until I have to bring it in for emissions? By the way, If you have old or high mileage cars, A code reader is one of the best investments you can make. It has probably saved me over $500 so far.

nFamousCJ - Keeper of Stringbean, Gengars and a Deezul > 404usernotfound 02/03/2015 at 22:01

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Remove cats, add dummy 02 sensors, add open exhaust = awesome

Rico > 404usernotfound 02/03/2015 at 22:02

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Fuel mileage may be impacted.

404usernotfound > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 02/03/2015 at 22:03

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It would sound awesome for a week, until I started to go deaf. Sounds like an awesome idea.

404usernotfound > Rico 02/03/2015 at 22:04

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Its been a few days, and the indicated mileage is normal, but I will check it next time I go to the pump.

Rico > 404usernotfound 02/03/2015 at 22:08

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I suggest you check after a month.

deekster_caddy > 404usernotfound 02/03/2015 at 22:08

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O2 sensor should get a 'crosscounts low' or other code if the O2 sensor is actually bad. Given that this sensor is post-cat, it's possible you will get this message instead of the typical O2 sensor warnings. Does it accelerate normally? Better than normal? Seem sluggish?

 > 404usernotfound 02/03/2015 at 22:10

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Yup, go ahead and fix that check engine light.

404usernotfound > deekster_caddy 02/03/2015 at 22:10

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Acceleration feels pretty normal.

Funktheduck > 404usernotfound 02/03/2015 at 22:21

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I ran my corolla for 100k miles with that code. Was a pain every birthday tax season when I had to get emissions done. It was doable.

nFamousCJ - Keeper of Stringbean, Gengars and a Deezul > 404usernotfound 02/03/2015 at 22:30

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hearing is over rated. Incredible exhausts are designed for the listening pleasure of everyone else

jvirgs drives a Subaru > 404usernotfound 02/03/2015 at 22:45

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oddly enough. My 04 sentra has thrown the same code. I think mine is a combo of the cat failing and the O2 sensor because my engine is on its last legs. I've said fuck fixing it and am currently looking for a new(ish) car

AMGtech - now with more recalls! > Rico 02/04/2015 at 02:30

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Not likely, this fault is usually set by the rear O2 because it's seeing too many hydrocarbons. The rear O2 almost always is only there to monitor the performance of the catalyst. Fuel economy is more likely to be impacted by the car being plugged, which it probably isn't badly enough to notice.

Buick Mackane > 404usernotfound 02/04/2015 at 02:32

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Does your state require SMOG testing? Any check engine light (MIL) will instantly fail your SMOG test here in California. Get yourself a bottle of "Cataclean" catalytic converter cleaner, it will clean it up enough to pass SMOG. Run your fuel tank down to about four gallons, add the Cataclean and drive for at least 15 miles, per the instructions. Scotty Kilmer on Youtube suggests that you can unbolt the Cat and soak it in soapy dishsoap water overnight and then hose it out before reinstalling to clean it. Also, he says you can use regular laquer thinner, added to your fuel tank to clean up the Cat. Check out his video on Youtube.

AMGtech - now with more recalls! > 404usernotfound 02/04/2015 at 02:35

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Pretty sure you need a cat. There are other faults that usually come along to implicate an oxygen sensor. If that's the only code you've got I wouldn't be worried about driving on it.

DrScientist > 404usernotfound 02/21/2015 at 15:38

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assume youve cleared the code?

if it stays off a while, youre probably ok postponing a fix. if the light comes back on immediately id consider investigating the o2 or cat.

404usernotfound > DrScientist 02/21/2015 at 16:27

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The light came back on about 50 miles after I cleared it.