Feb 2, 2010 · I have started getting a P0430 code on my 2006 4.0L. It is occuring with increasing frequency over the last 1000 miles or so and interestingly seems...

Jul 10, 2012 · I bought a OBD II Bluetooth scanner and it is pulling P0420 and P0430 codes. I am curious what is the best course of action, I don't have to worry about actual emissions (no testing in …

Dec 2, 2025 · Chasing a P0430 CEL code (Catalyst system efficiency below threshold bank 2) popping up every few hundred miles on my 2005 Land Cruiser. I’ve tried a bottle of CATACLEAN that didn’t …

Mar 26, 2011 · Some posts said that if you have both codes p0430 and p0420 at the same time, your cats need to be replaced. Other posts said that if your cats are much hotter downstream than …

Dec 5, 2018 · The CEL and the VSC OFF/TRAC lights turned on in my 2007 LX470 so I plugged it in and saw that it's throwing a code P0430. Where should I start with this? I...

Mar 1, 2015 · I noticed after I clear my CEL ONE p0420 & p0430 code remain in the system if I read it again. I’ll drive some and when the light kicks back on that’s when two more p0420 codes appear …

May 16, 2010 · 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 …

Oct 27, 2013 · With just a P0430 or a P0420 only, we focus more on that bank. P0430 is bk 2, so we focused more on head to rear of O2 in bk 2. Like bk 2 Vacuum leak (intake gasket of Bk 2), fuel …

Oct 31, 2016 · P0420 and P0430 only trigger if your downstream catalytic converter is not reading cleaner air than your primary O2 sensors, letting you know your cats are 1. BAD, or 2. MISSING. …

Aug 10, 2012 · Cliffnotes: I've been throwing P0420/P0430 (catalytic inefficiency right/left bank) codes since earlier this spring and now have to replace the exhaust manifolds. History: 06/06 build date, …