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keltastic1 07-08-2013 11:30 AM

Check engine light -P430
I have had the check engine light on for over a year. We checked the code and it says P430. We have replaced all O2 sensors and the light won't go off. Any one else have this problem? I have heard that the unlimited have been known to have problems with the manifold, so we were thinking of looking into that.

2007 Jeep Wrangler X unlimited

Thank You,

HOOCBB 07-08-2013 12:44 PM

I'm guessing the code is actually a P0430...

Anyway, that code typically means you need to replace your catalytic converter(s). I was taught that the cats don't go bad without something else causing it (too much fuel, burning oil, etc), but was told otherwise in one of the stealerships I worked at.

Regardless, according to, the 3 main causes for this code are:

Catalytic Converter not functioning properly
O2 sensor not reading (post cat)
Exhaust leak

Check all three before jumping to conclusions, especially since cats are not particularly cheap.

OBD-II Trouble Code: P0430 Catalyst Efficiency Below Threshold (Bank 2)

keltastic1 07-08-2013 02:15 PM

It has been on for over a year. From my previous experiences with bad cats, it makes the vehicle bog down and you have to really push it to go. I'm not experiencing that at all. It's been on now for over a year and my jeep runs fine. Will it run fine for over a year with a bad cat?

keltastic1 07-08-2013 02:19 PM

I saw on another forum, to try to run sea-foam through it. If there is an exhaust leak then it will smoke. Have you heard of doing that.

HOOCBB 07-08-2013 02:32 PM

I've never used Sea Foam in that capacity. I'm not sure I would want to be crawling under/around the Jeep when it is producing the cloud of smoke.

Yes, generally a bad cat will cause sluggish acceleration, but most vehicles I have seen throw this code did not exhibit the same characteristics. For that matter, the ones that DID have sluggish acceleration didn't have the code.

Sadly, when dealing with cats, there is no hard and fast rule.

Just be sure to check the other items out before replacing the cats.

ImpulseShot 07-08-2013 02:32 PM

I'm not sure about your Jeep, but with mine I have to clear the codes with a code reader before the check engine light will turn off.

legitposter 07-08-2013 02:35 PM

You should take it to the dealer. Dealers are very lenient when it comes to cat failure because it has to do with the emissions system and laws. Not only is it covered, by law, for 10 years but they'll also tend to ignore mods as the culprit.

Tomdata 07-08-2013 02:38 PM

P0430 is related to catalyst efficiency for bank2. It simply means the catalytic converter cannot reduce the emissions as good as it did when it was new and it has fallen out of the allowable limits. The PCM monitors rear o2 sensor activity and compares it to front o2 sensor activity. With a good catalyst the rear o2 sensor reading will be stable because the catalyst is using up the o2 in the exhaust to reduce hc and co while in closed loop. When the rear o2 sensors start switching rich/lean at a similar rate to the front i2 sensors it means the catalyst is no longer working efficiently and the PCM sets either a p0420 (bank1) or p0430 (bank2) code.

A catalytic converters efficiency can be reduced without it being plugged. Reduced efficiency often means a hollow cat

Tomdata 07-08-2013 03:50 PM

One more thing. Catalytic converters and most "emissions related" equipment is federally mandated to be warrantied for 8years/80k miles for all cars sold new in the u.s. after 1996. Vehicles with sulev and/or pzev (economy cars) emissions ratings have between 100-120k mile federally mandates emissions warranty.

The emissions warranty is separate from the standard 3 year 36k mile warranty that is standard on most new vehicles. Don't be scared of a trip to the dealer for the p0430 code if your under 8 years and 80,000 miles it will most likely be a free repair. The bad news is that if the p0430 code is the only code you had set you wasted a bunch of $$ replacing all those o2 sensors.

legitposter 07-08-2013 09:48 PM

I said 10 years, sorry. 8 is correct. Still, most people trade in by 8 years so its good.

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