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  #1 (permalink)  
Old 01 Jul 2011, 01:00 am
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Default P0420

Hey guys, so i was talking to Melsbabe and while we were chatting her engine light came on. Shera gave a P0420 code. I was checking out this old thread P0420--Cat efficiency low bank 1? and i'm thinking that she just needs the CAT converter replaced. What do you think? And if there is a warranty then she might be in luck. Shera's an 05 t-lite, can't remember how many miles but she just overheated not to long ago too. Poor Shera, she's sick and needs help.
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Old 01 Jul 2011, 01:24 am
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Default Re: P0420

Be cheaper to check to see if the downstream o2 sensor works or not.

The downstream sensor plugs right into the CAT, and if it's not working right or if the CAT for some reason is hollowed out then you'd get a P0420.

Normally, if the CAT is FUBAR you'd get that nasty rotten egg smell.
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Old 01 Jul 2011, 04:19 am
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Default Re: P0420

Cats are covered under federal emmissions warranty 8 year/80,000 mile. O2s however are not so it might be cheaper to try a downstream O2 first.

Note though, a new downstream O2 with an old upstream O2 can also set this code or any exhaust leak before the cat.
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Old 01 Jul 2011, 11:15 am
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Default Re: P0420

it is probably the O2 sensors or the wiring/connector.

Time to have them repalced with new Mopar sensors.
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Old 01 Jul 2011, 07:49 pm
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Default Re: P0420

On a turbo model or even an NA, is it hard to get to the O2 sensor?
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Old 02 Jul 2011, 12:08 am
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Default Re: P0420

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Originally Posted by WolfmanG View Post
On a turbo model or even an NA, is it hard to get to the O2 sensor?
Not at all....read my post, the downstream sensor is ON the CAT. If you can see the cat, and jack the car up you can get under there and remove it.

If it is indeed the o2 sensor that's out, go with an OEM replacement. And also, DO NOT FORGET TO PUT ANTI-SEIZE ON THE THREADS! I'd recommend replacing both o2 sensors, they're not expensive.

On an NA, you can see the upstream sensor right there on the headers (behind the block close to the firewall). For a turbo model, it'll be on the o2 housing. It's not hard to remove, just takes a bit of reaching up above the downpipe. The downpipe with inline-CAT connects to the o2 housing, so it's impossible to miss.
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Old 03 Jul 2011, 01:34 am
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Default Re: P0420

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Originally Posted by Kawizx9r View Post
Not at all....read my post, the downstream sensor is ON the CAT. If you can see the cat, and jack the car up you can get under there and remove it.

If it is indeed the o2 sensor that's out, go with an OEM replacement. And also, DO NOT FORGET TO PUT ANTI-SEIZE ON THE THREADS! I'd recommend replacing both o2 sensors, they're not expensive.

On an NA, you can see the upstream sensor right there on the headers (behind the block close to the firewall). For a turbo model, it'll be on the o2 housing. It's not hard to remove, just takes a bit of reaching up above the downpipe. The downpipe with inline-CAT connects to the o2 housing, so it's impossible to miss.
Kool thanx bro. I'll let her know.
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Old 19 Sep 2012, 05:58 pm
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Default Re: P0420

Quote:
Originally Posted by Kawizx9r View Post

If it is indeed the o2 sensor that's out, go with an OEM replacement. And also, DO NOT FORGET TO PUT ANTI-SEIZE ON THE THREADS! I'd recommend replacing both o2 sensors, they're not expensive.
What does a dealer charge for these? Autozone says they want $24 and $25 (Bosch) or $51 and $46 (Denso).
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Old 19 Sep 2012, 08:09 pm
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Default Re: P0420

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What does a dealer charge for these? Autozone says they want $24 and $25 (Bosch) or $51 and $46 (Denso).
i would think around the same price as the Denso one's but i wouldn't risk it, you should just get one from the dealer.
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Old 20 Sep 2012, 01:58 pm
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Default Re: P0420

There's only 4 things that would cause this code:

A bad o2 sensor as stated before, a bad cat, poor engine condition, or an exhaust leak.
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