kingof951

iTrader: (1)

keep getting p0430 bank 2 catalyst effeciency below threshold. would this cause it u think? anyone?

kingof951

iTrader: (1)

dont see or hear any exhaust leaks. just the big *** dent btw

RPM WS6

iTrader: (3)

That dimple is normal. They all came that way from the factory.

P0430 is a common code. It simply means that cat efficiency is below a preset threshold (thus a reduced oxygen storage capacity of the cat, and an increase in tail pipe emissions). In some rare cases, replacing the O2 sensor will solve this. Mostly, the issue is that coatings have worn off the cat substrate and emissions levels have increased.

You live in CA so you'll have to deal with this at some point to pass emissions.

kingof951

iTrader: (1)

ok. yea i figured it was a bad cat. been looking for a replacement on here but no luck. thanks

wssix99

iTrader: (5)

I'd also shake the pipe a bit and see if you hear any rattling. You could also have a broken substrate in the CAT.

As RPM WS6 pointed out, the O2 sensor is much more likely to be the culprit at this age - so that's the place to start if there are no obvious signs of breakage in the CAT.

RPM WS6

iTrader: (3)

Here is another thread from yesterday about this:

https://ls1tech.com/forums/general-m...smog-test.html

In this case, the cats were still working as per the sniffer test results, even though this code was present. If yours still passes the CA sniffer too, and it's only the code that is causing you to fail an OBD scan test, then you can always disable P0420/P0430 via custom tuning.

kingof951

iTrader: (1)

Ill switch the bank one and bank two cats and see if I get a 420 instead of 430

RPM WS6

iTrader: (3)

Be advised that doing so would require custom fabrication since the factory cats, as designed for the stock exhaust, are not interchangeable between banks.

You could, however, swap O2 sensors from bank to bank and see what happens. In the thead I linked above, I believe that new O2 sensors still didn't get rid of the code, yet the cats managed to pass the exhaust sniffer just fine. That was why I recommended code deletion to the poster in the other thread.

kingof951

iTrader: (1)

That's what I meant o2s lol. Sorry I just woke up. And code deletion wouldn't show up on the obd smog test?

kingof951

iTrader: (1)

I live in CA smog test rape capitol of the world.

wssix99

iTrader: (5)

Don't forget anti-size compound on the sensors when you switch them. (Under warranty repairs) A dealer took one of mine out and didn't apply the compound.

That was very very very bad...

kingof951

iTrader: (1)

Yea I've had that happen to me too. Any thoughts on the code delete and CA smog?

wssix99

iTrader: (5)

Clearing the code is easy. Most scanners will do that for you. The catch is that you have to drive the car for a while afterwards in order for the car to build up enough history to pass the test.

kingof951

iTrader: (1)

oh i have a scanner that i keep deleting the code with but it always comes back. just wondering if a permanent tune delete or o2 sim would still pass smog

RPM WS6

iTrader: (3)

It does here in IL, I know that first hand.

I can only assume that the scan test portion is the same in CA, but I can't know for sure.

kingof951

iTrader: (1)

Ok thanks for the answers