i need a reading translated from an obd2-im getting a P0420 code in my 2001 nissan maxima se, and I would like to know what my readings mean?Parameter Description ResultsP0420 Catalyst Efficiency Below Normal (Bank 1) DTC for which Freeze Frame was Stored P0420Fuel System 1 Status Closed LoopFuel System 2 Status Closed LoopCalculated LOAD Value 30.20 %Engine Coolant Temp 188.60 °FShort Term Fuel Trim - Bank 1 -0.78 %Long Term Fuel Trim - Bank 1 0.78 %Short Term Fuel Trim - Bank 2 5.47 %Long Term Fuel Trim - Bank 2 0.00 %Engine RPM 2,450.00 rpmVehicle Speed Sensor 67.11 mph
Hello and thank you for using JustAnswer.com
Before you go thinking you need a Catt Converter right away. There is a Ecm update for this code.
The reprogram can only be done at the dealer I am afraid, but I would do this update first before replacing the catt.
If you have any more questions on this, please feel free to ask. Thanks Jay1
its a california car, so i cant flash the computer, its already set to california specs. i just wanted to kno what those readings ment, i think my cats are fine, so im trying to diagnose a possible 02 sensor...but seeing as there are 4, i was hoping that these readings might indicate which one possible
Sure you can!
This is a service bulletin
You need to first check your Ecm part number, and then you take that number and look in the data base and see if it applies to the bulletin.
im not following, are you talking about seeing if my ecm can be reprogramed in california?
Hold on. Federal models don't apply to this bulletin. Click HERE to view the bulletin
It's for Maxima's with California emissions.
The dealer does this reprogram,
I would do this first before replacing the catt
But if you continue to get the Catt code, then your most likely going to need a catt.
Catt codes are not from bad 02 sensors, but based on 02 sensors that are working.
If the rear 02 sensor start to mimic the front 02 sensor, that means the catt is not functioning and that it will need to be replaced.
The reprogram is a suggestion to try to help avoid the catt replacement since there is a Ecm update for this code.
If you have any more questions on this, please feel free to ask. Thanks Jay!
dude, thats badass. I didnt find anything like that in the forums like that. but i did read that is usually never the cat, they are supposed to last the life of the car, pending theres no significant damage