Catalityc converter on explorer 96 XLT V6

[Oct714]

My check engine is ON, and after getting a diagnostic, the diagnostic is code is PO420 (The PCM has determined that the catalyst system efficiency for bank 1 is below threshold for the current engine operating conditions. Bank 1 identifies the location of cylinder #1, while bank 2 identifies the cylinders on the opposite bank)

The main cause for this, a general mechanic said, one of the 4 catalizers needs to be replaced. (4 catalitic converters in this truck?, is that possible?) Obviously, being a general mech, he would recommend me to another mech shop.

Looking under the truck, I can see what it looks like 2 catalizer in serie, just before the muffler, not 4. Also, checking at autozone, they carry 2 types:
Universal Fit(around $80), and Direct Fit ($360, look as 2 universal fit converters, similar to the one on my truck)

One of Pep Boys guys reccomended me to consult with a well known mechanic to identify which catalizer is the one needed to be replaced, otherwise a dishonest mech might just put a cheap cat and charge me for the expensive one. Somebody commented me fixing this might cost me up to $1,000.

Now, so far I have managed to fix most problems with my cars myself, but this is over my head, so a real mech has to fix this. I only want to be sure, I will be charged the right amount, since I don't think this truck has 4 catalizers, and for what I've seen, there is not way to replace 1 out of 4, not even 1 out of 2. It looks as the whole catalitic assemble will have to be replaced (direct fit?).

[shorod]

If you were to use the "Search this forum" feature from the Explorer forum main page for the keyword P0420, you'll find a few threads in addition to this one (http://www.automotiveforums.com/vbul...ighlight=P0420) which provides a lot of good information. Bottom line, don't rush to condemn the catalytic converter. Even if a converter is your problem, you need to address the other possibilities since more than likely, some other issue caused the catalyst to fail.

From your description, it sounds like you have the 4.0L V6 (not the SOHC V6). According to the service manual, you have a front and a rear three-way catalytic converter. The two banks of exhaust y together and enter the front converter and a few inches after exiting the front converter enter the rear converter.

-Rod