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Old 03-05-2009, 06:14 AM   #21
ramblinwreck
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2007 RTL
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Question Re: P0420 engine code

Hey all- new member here. Got RTL with 93,993 miles on it and now getting the 420 code on bank 1. is there anyway to tell whether the downstream or upstream o2 sensor should be replaced, or should they be replaced in tandem? I wanted to this before investing in a new cat....was going to go with ngk sensors if available...are these any better than the bosch sets? thanks for your input!

Last edited by ramblinwreck; 03-05-2009 at 10:41 AM.
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Old 03-05-2009, 11:40 AM   #22
Just Ask
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Re: P0420 engine code

Quote:
Originally Posted by ramblinwreck View Post
Hey all- new member here. Got RTL with 93,993 miles on it and now getting the 420 code on bank 1. is there anyway to tell whether the downstream or upstream o2 sensor should be replaced, or should they be replaced in tandem? I wanted to this before investing in a new cat....was going to go with ngk sensors if available...are these any better than the bosch sets? thanks for your input!
Try switching just the upstream one with a sensor from bank 2. If you still get 420, then you know it's the downstream one on Bank 1. If you get a 430 (I think that's the one for Bank 2) then you know it's the upstream one (now) in bank 2. No need to pay for two if only one is bad - they aren't cheap nor returnable.
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Old 03-05-2009, 01:09 PM   #23
ramblinwreck
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Re: P0420 engine code

Thanks for the response! That makes a ton of sense. Any ideas as to what brand to get if i replace?
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Old 03-05-2009, 08:37 PM   #24
Just Ask
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Re: P0420 engine code

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Originally Posted by ramblinwreck View Post
Thanks for the response! That makes a ton of sense. Any ideas as to what brand to get if i replace?
I would go with whatever Honda OEM is...the first one was good for 93k miles ya know :-)
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Old 03-09-2009, 05:14 PM   #25
TeamRidgeline
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Re: P0420 engine code

Looks like I just joined the club ...

http://www.ridgelineownersclub.com/f...ad.php?t=26867
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Old 01-01-2010, 09:50 PM   #26
starfixer
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Re: P0420 engine code

ok now have had this twice but last time reset it and changed gas to premium ran for around 2000 miles and just popped on again on the way home. Had decided to try 87 oct again about 2 tanks back and yesterday filled up with 93+. My dilemma is this if I take it to Dealer are likely to look at it charge me and then say it is a tank of gas after resetting it. They really do not like to do anything that may or may not be under warranty, and I thought there was an 80000 mile emissions warranty, but when looked up the info on fed site and honda states manufacturers usually cover it underpowertrain and Honda states 3yr 36000 for the powertrain. any body know of anywhere in particular that has the federal guidelines that state otherwise? I do not want to pay for a deductble on the extended warranty for them to do nothing per say. Or am I just worrying to much and it is just the winter mixture again. I wouldnt mind changing the sensors out and checking them if I could, but I have done the unthinkable ( I have not purchased a book!). LOL I have been meaning to but yeah I know. I would appreciate any suggestions. Or think I should try to argue with the dealer and see if they will cover the sensors/Cat? btw 62000 miles. thanks
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Old 01-02-2010, 08:11 AM   #27
CUinaRidge
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Re: P0420 engine code

Mine came back on in December, filled the tank up and the light went off. It has not been on since...
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Old 01-02-2010, 08:59 PM   #28
Jack
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Re: P0420 engine code

Where I am in Virgina, or Taxginia as we call it, this is the scam they use. 1st they drive your car into the stall and if any lights are on you automatically fail but have to pay. Then you get a waiver to fix it. If they drive it into the stall and there are no lights but they connect to the computer and it shows a code, stored, whatever, automatic fail and repeat waiver process.

On older cars, usually pre 1996, they put the probe in your tailpipe (that sounds weird) and test the actual emissions, which is way more accurate IMO.

The old method gave you a range and if your emissions were in that range then you were fine. If not then a fail. The computer does not give you a snowballs chance in hell. A bad sensor can cause a fail when your car is actually withing established limits.

Just another way to screw ya!
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Old 01-23-2012, 08:33 PM   #29
comquat1
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Re: P0420 engine code

Just got this code the other day along with some others. Went and bought a code reader that can reset them and did that the following day and drove all day today and it did not come back on.

One thing I noticed is typically my truck is driven all day and rarely goes out at night. The night it went on I went out and the truck was parked outdoors in temps below 20 degrees and it went on when I was on my way back home.

I've noticed a few oddities with my ridge (and 06 of which i'm the original owner) the last couple months when it's bitterly cold out. I'm seeing the airbag light go on and off also, when it warms back up it goes off again.

I'm thinking if this truck was kept outdoors regularly that I'd be having way more issues with it than I've had, which up until the last month was zero issues in 166,000 miles.
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Old 01-24-2012, 12:24 AM   #30
carolinaridgeline
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Re: P0420 engine code

I have been getting this code for about six months now and the code reader indicates Bank 1. I am not sure if this is the CAT between the radiator and engine or the one between the bulkhead/firewall and engine. Can anyone tell me? I continue to reset it and it comes on every couple of weeks. Now, my Ridge has 138,000 miles on also. Do I need to stay with OEM CAT or is there a a pretty good aftermarket CAT I can use?
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