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Forums Nissan Models Altima P0402 after replacing O2 Sensor
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  #1 (permalink)  
Old 04-25-2011, 06:44 AM
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Default P0420 after replacing O2 Sensor

SES light came on intermittently the past couple of weeks. Could reset it and it would come back or sometimes it would reset itself. The code was a P1147 or a P0138. Both codes pointed towards the O2 sensor after the cat.

Replaced the sensor with a NGK/NTK one over the weekend. After driving it for a couple of hours, checked the codes and there was a pending code of P0420, catalyst below efficiency.

The cat was changed out less than 40,000 miles ago so I'm doubting there is really an issue with the cat. After resetting the code with my code reader, I've checked it again after probably 100 miles or so and there is no pending code. I will check it again this evening after another 100+ miles.

So, I don't know why it showed this code and hoping it doesn't come back. I've seen some say a P0420 can be caused by a bad O2 sensor, (rear) but since this is the one I just replaced, I'm confused.

Ideas?
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Last edited by DCARLTON; 05-09-2011 at 05:34 AM.
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Old 04-25-2011, 01:41 PM
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A possibility this code was there all along triggered by P1147 or P0138. You have cleared it and hopefully it won't return.

Thanks for the post. My SES light has been on about 3 wks. now and I'm looking for H02 sensor. My dtc is P0038 that also points to the post cat H02 sensor. I was thinking it just might be carbon up when I drove the car a few times before I could replace the dead ignition coil causing the misfire. Also will read up on the above 2 codes.

Is NGK/NTK the OE sensor?
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Old 04-26-2011, 04:10 AM
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I've read/heard that the OEM sensor is a Bosch but it was at least $20 more expensive. Looking at the original one, it had the Nissan symbol on it but was otherwise non-descript when it comes to actual brand.

So far, no code and she drove it 100+ miles yesterday.

Now fighting something else. Seems to run fine but while she was stopped at a redlight, the car shuddered 1 time then up to 4 times, almost like a misfire. It did this a couple of times at different red lights.

Checked codes and there were none, so I don't know what's going on there. Guess I've got to work on that now or wait on it to get worse. Thinking it's fuel related so may check fuel pressure. Anyone know if there is a valve on the fuel system to check fuel pressure?

Also read somewhere that a bad ground to the transmission may cause issues like misfires so going to check that tonight.
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Old 05-01-2011, 03:03 AM
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It's probably a Unisia JECS sensor, which is licensed by Bosch to be sold in the US. An NTK/NGK or a Bosch direct fit (not universal) should work fine....
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Old 05-06-2011, 02:24 AM
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i had this problem ,the manifacture put a metal gasket on the intake.i changed it and the crazy idleing went away.but now i have the po420 code on.i reset it with the pocket scanner but now its back on.can some one help
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