Looked at the FAQ section and did a search for this code. The question I have is that it appears that my 04 with an I6 has 4, count them FOUR O2 sensors. Most of the posts I found seem to indicate that this code (P0432) indicates a bad O2 sensor. Question is the code indicates a problem in BANK 2. So, which sensors are bank 2? I am attaching some pics. My O2 sensors are all together. 2 are located right below the manifold in the first pic and 2 are located about a foot lower in the exhaust system in the second pic. None of the sensors are back by the CAT. Weird! Anyone else had this problem code with this O2 set up and how did you resolve it? ANY help is appreciated!
The upper two sensors:
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The newer jeeps have a 2 stage catalytic converter system. the first stage is located between the sets of O2 sensors. The upstream sensor regulates the fuel/air ratio, while the sole purpose of the downstream sensor is to monitor the efficiency of the stage 1 cat (2 of them, hence 2 upstream and 2 downstream sensors). Bank 2 is the rear-most of the two.
Check the lower sensor (downstream) on that bank. If the sensor is ok, then you have a stage 1 catalytic converter failure. Fortunately, that assembly is covered under a federally mandated 8 year, 80,000 mile emissions warranty ($359 for the part if you're outside that).
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Did you have any luck replacing the o2 sensor? I'm getting the same code. I can't believe that the main cat is bad. My Jeep runs fine.Which sensors are for bank 2? I've got to take my Jeep in for an emissions test. Could you let me know how you fixed your problem? Thanks!
I had this same thing happen twice. The first time I was under emissions warranty and ended up just paying for the 02 sensors. The second time I was way out of warranty and I did the 2 mini cats, main cat, 4 os sensors, hangers, associated hardware, and a cat back for about $1000 using all Rockauto parts. If you need the cats as someone said above the 2 min cats are like $400. Oh and please if you do decide to replace just the 92 sensors to diagnose the problem do not use Bosch. The Bosch do not play well with the Ecu, use NGK they are the OEM manufacturer and they are actually cheaper than Bosch.
Good Luck any Q's just ask.