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Discussion Starter #1
I have a 96 Sable and it started missing and has died a few times I ran the computer on it and it came up with P1401auxiliary emission control and P0430 bank 2 catalyst deficiency below threshold .

What are these and can I fix it my self??

Any help would be great.
Thanks Gary

132 Posts
hey, I had similar issues with my 97 taurus. with the vulcan engine,
it took me forever to figure it out but,the issue was resolved after,
running injector/fuel system - cleaner, one bottle of the cleaner for every tank full
I let the tank go down to 1/4 before refueling and adding another bottle of the cleaner.
after the third time, the problem was resolved.
now I use the fuel system cleaner once a month before I fill up.

for the first three times I used the -sea foam- fuel system cleaner and there after I started using the
-prestone complete fuel system cleaner- the one that comes in a grey bottle.

what do you know? all those agonizing problems were being caused, by the carbon build up.
I still can't believe these issues are related!
good luck! hope this helps.

att: j/e

3,748 Posts

Catalyst 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 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.


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

A 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 Solutions

First, 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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