my 1998 ford explorer with the 5.0 in it is showing trouble code, exhaust catylst efficiency below threshold bank 2. is this a o2 sensor or is it the cat?? if it is the o2 sensor which one is it??

i am guessing that it is the 02 sensor because the fuel milage has not go any worse. it was actually getting better before the light came on. even now that it is on its still not go any worse and the vehicle seems to be running fine still.

 

Is the Explorer Forum broke down ?

What was the actual code number ?

 

P0430 OBD-II Trouble Code
Technical DescriptionCatalyst System Efficiency Below Threshold (Bank 2)

What does that mean?Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 (passenger side) 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.

SymptomsYou will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

CausesA code P0430 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 SolutionsThe simplest thing to do is to reset the code and see if it comes back.

Then inspect for exhaust leaks.

Next step is to measure the voltage at the oxygen sensor on Bank 2 (the passenger side rear sensor, or the sensor after the converter). The voltage should be low and steady (~200mV, depends on the vehicle). If the voltage varies (e.g. 100mV to 600mV) then it's time to replace the catalytic converter. 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.



P0431 OBD-II Trouble Code
Technical Description
Warm Up Catalyst Efficiency Below Threshold (Bank 2)

What does that mean?Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 (passenger side) 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.

SymptomsYou will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

CausesA 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 SolutionsThe simplest thing to do is to reset the code and see if it comes back.

Then inspect for exhaust leaks.

Next step is to measure the voltage at the oxygen sensor on Bank 2 (the passenger side rear sensor, or the sensor after the converter). The voltage should be low and steady (~200mV, depends on the vehicle). If the voltage varies (e.g. 100mV to 600mV) then it's time to replace the catalytic converter. 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.

 

ok, its code P0430. i have a multi meter to check the 02 sensor. do i have to check it while the vehicle is running?? also where do i stick the meter probes to check it?? also how many 02 sensors does this thing have on it?? do you still think its cool to drive this thing or should i park it until it is fixed?? i drive a pretty good way from homm to work every day and do not want the agrivation of being broke down on the side of the road. i do have another vehicle to drive if need be.

 

I don't think so. Thread moved there.

-Matt