I have this code on my 06 Altima. I was told at local shop that its no big deal just to run it. Machanic told me If I took it to the dealer they would tell me I had to replace the catylic converter which is part of the manifold or something and it would be like $1,000 just for the part.
Do any of you have any experience with this and have a answer for a fix or any suggestions? Thanks a million!!!
Well I replace the plugs as they needed it really bad 179,000 miles on them. I showed that this could throw catalyst code also. I reset the codes so hopefully this fixed all my problems. Thanks!
I had this same p0420 code. My horse power went down. My gas mileage decreased. My engine would cut off and on.
I changed the front O2 sensor. After replacing the O2 sensor, this went back to normal. So I assume the oxygen sensor did need to change.
Then my SES light was still on. This time I got a different code (forgot which one it was), so I replaced the crankshaft sensor, which is what the code suggested.
Nothing has changed after the replacement of the crankshaft sensor (other than a lighter wallet).
Yesterday I added SeaFoam to the gas(5/8 of can) and oil (3/8 of can). I drove the car roughly 50 miles. Then I changed the oil last night.
So far after driving roughly another 50 miles, it is driving like normal and gas mileage seems to be right. And most importantly NO SES LIGHT.
So maybe I just got some bad gas and now I am good. Maybe none of this is helping. But I thought I would share with you what I have done. And as of now, I don't have an SES light.
Nothing out of the ordinary with this car just the SES light is all. I was under the impression not to ever add any additives to engine or gas in my 2006 Altima.
The exhaust manifold/catalytic converter assy. MSRP's for $547.33...not $1000. You can get it for $413+shipping from 1st AAA Nissan Parts Store. Rockauto.com has Dorman manifold/converters for $294 (Fed emissions) and $364 (CA emissions).
The exhaust manifold/catalytic converter assy. MSRP's for $547.33...not $1000. You can get it for $413+shipping from 1st AAA Nissan Parts Store. Rockauto.com has Dorman manifold/converters for $294 (Fed emissions) and $364 (CA emissions).
Thanks for the info. I'm sure the $1000 is with installation at a dealer.
Thanks for the info. I'm sure the $1000 is with installation at a dealer.
Do a fairly simple check, remove the heatshield over the manifold, it's 4 10mm bolts. Look for a yellow dusting on the manifold itself, if you find it then your catalytic converter has cracked and the catalyst is breaking up. This doesnt sound bad except I've had more than one customer with engine failure becaust they decided the catalytic converter wasnt important enough to replace. The catalyst back feeds into the combustion chamber, scores the cylinder walls and ruins the rings. I'm not sure what mechanic told you to "just drive with it" but he is not a person I'd allow to service my vehicles. Your dealership can perform an SRT on the catalytic converter to check if it's performing properly, it's a part of the older Consult II scan tool.
About how much does this SRT test cost? I would rather be safe than sorry. The car now has almost 200,000 miles on it but its still like a new car. Its started using oil maybe 1qt between changes 3,000 miles changes.
Ok I just called local Nissan which is 100 miles away. Service Tech told me up front is a $95 diagnosis fee which will go towards the cost of the repair if we decide for them to fix the problem. He also said around $700 for the part and he said anytime a converter is the problem looking at around $1,000 labor. Also he said the O2 should probably be replaced. This is just ridiculous how can they expect people to afford this type of thing. They want $229 to do a tranny service for Christ sake its drain and fill just like a oil change. If anyone has another solution for this please give me info cause I just cant afford this. Thanks for you guys help.
Ok Thanks. I will show this to my mechanic. I really honestly don't know much about it. I figure it might be the cat with almost 200,000 on it. But maybe not.
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P0420 Catalyst System Efficiency Below Threshold Bank 1
Linear Mode
