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Old 07-14-2013, 09:09 PM   Thread Starter #1
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Default P0420 Code On And Off Crazy

I need advice,, last year i was getting this code,, it would come on and go away,,,, come on and go away again ,, it hasnt popped up for about 5 months ,, but it came back on again last week,, when i got the code read the guy cleared it without asking me ,, so it is off again,, im not sure what to do here,,, please anyone help me with this dilemma ,,, thanks family

---------- Post added at 09:09 PM ---------- Previous post was at 09:09 PM ----------

and im at about 140,000 KMS
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Old 07-15-2013, 10:37 PM   #2
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Default Re: P0420 Code On And Off Crazy

Originally Posted by adzmccauley View Post
I need advice,, last year i was getting this code,, it would come on and go away,,,, come on and go away again ,, it hasnt popped up for about 5 months ,, but it came back on again last week,, when i got the code read the guy cleared it without asking me ,, so it is off again,, im not sure what to do here,,, please anyone help me with this dilemma ,,, thanks family

---------- Post added at 09:09 PM ---------- Previous post was at 09:09 PM ----------

and im at about 140,000 KMS
You need to have someone scan that post cat sensor. If the sensor is not putting voltages within specs as per FSM it could be one or two things.
1. Cat
2. Sensor
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Old 08-05-2013, 04:39 AM   #3
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Default Re: P0420 Code On And Off Crazy

Originally Posted by BurntOrangeAppeal View Post
You need to have someone scan that post cat sensor. If the sensor is not putting voltages within specs as per FSM it could be one or two things.
1. Cat
2. Sensor
I have the same issue. By scan do you mean with an engine code scanner or something more high tech? I'd rather spend $100 to buy a decent scanner than $110 for the hour of labor they would charge to scan it. But it is what it is. last thing I want is a crumbling cat.

P.S. My gas mpg has dropped to about 16 mpg. That's in the last couple months. Was 19-20. I know its still crap but I drove a newer maxima and it was still 19-20. Its how I drive
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