I have an engine code P0431 Warm up catalyst efficiency below threshold ( bank 2 )
Bank two is the side with cylinder number 2. The even number cylinders should be on the side next to the radiator.
BANK 2 IS THE HEAD THAT IS SET BACK ON THE ENGINE MORE IF YOU LOOK AT ALL THE V6 V8 MOTORS YOU WILL NOTICE 1 CYLINDER IS TORWARDS THE FRONT OF THE ENGINE MORE THAT IS BANK 1 THE OTHER IS OBVIOUSLY BANK 2
SOURCE: Service Engine Soon
you need to change all the o2 sensors reset the computer it might come back on a couple of times just keep resetting it you could buy one of the cheap code scanners for 49 or 59 dollars and reset yourself if you go to a shop they are going to sell you a catalytic converter for a few hundred bucks and the code will come back. let me guess you got about 100,000 miles on it what it really means is a shop or dealer will get paid for a cat job when you dont need one
SOURCE: my car show me service
P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.
Causes: A code P0431 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak
Possible Solutions: Inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
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