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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   1989 toyota pickup 3.0 crank no start I have a 1989 toyota pickup 3.0 crank no...   Strut spring orientation and strut mount tension nut 2017 Nissan rogue awd 2.5 L Put in Monro...   Transmission stuck in part, I have tried everything So I'm working on my elderly fathers 201...   2017 dodge journey LED headlights on/off randomly Year of vehicle 2017 Make of vehicle dod...   Kia Soul starter replacement issues! Okay so my car is a 2010 Kia soul 2.0 en...   Please Help - Knock sound & engine fail Hi all, Hoping to get some insight and ...   multiple warning lights 2013 GMC Terrain 130,000 miles 4 cylinde...   03 alero no low speed blower Good day everyone, I have a 2003 Olds a...   04 Chevy 2500hd tail light issues Help!!! I have changed my combo switch...   1999 Grand Caravan Sport not starting. Hi. I'm new here. I hope someone can hel...

P0420 SES 01 Nissan Sentra Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting bigl User Dec 7, 2008, 2:35 PM Post #1 of 3 (3312 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 (3303 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 (3297 views) Re: P0420 SES 01 Nissan Sentra Sign In Thank you very much for the information.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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