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P0420 SES 01 Nissan Sentra

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bigl
User

Dec 7, 2008, 2:35 PM

Post #1 of 3 (3173 views)
P0420 SES 01 Nissan Sentra Sign In
Hi, my daughter's SES light went on several weeks ago, it was on for about a week then went off. It has now been back on for the last 2 or 3 weeks. I had the code read at Advanced Auto, the code was P-0420. What is the best and most economical approach to this code? Thanks in advance and have a great Christmas season.
Larry


dmac0923
Enthusiast

Dec 7, 2008, 3:36 PM

Post #2 of 3 (3164 views)
Re: P0420 SES 01 Nissan Sentra Sign In
P0420- Catalyst Efficiency Below Threshold.

Your exhaust manifold contains a pre-catalytic converter and two O2 sensors (upper and Lower) the lower 02 sensor measures the efficiency of the converter.

if you can get a scan tool to look at the live data you can tell if the converter is bad or if the sensor is shot.

i have an 2002 sentra and these "pre-cats" are notorious for breaking up so it is possible that the converter is bad

when my converter got plugged i just removed the manifold from the car and took a long screw driver and "permanently unplugged" the cat.

these cars have two so you will still pass emissions
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1


bigl
User

Dec 10, 2008, 4:26 AM

Post #3 of 3 (3158 views)
Re: P0420 SES 01 Nissan Sentra Sign In
Thank you very much for the information.





 
 
 






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