Exhaust, CEL P0430

lawrenceon87 · 11-10-2011, 03:30 PM

Hey all, I had a few questions for you today and haven't been able to quite find the right answers using search. I had a muffler delete done on my 2007 e92 328xi about 2 months ago. About a week ago my CEL went off and is showing code P0430. I know that this means I have a bad post o2 or possibly a bad cat. Not sure what the problem is. I've seen a significant drop in mpg and the car likes to stay in the higher rpms while coasting or going up hill. If the problem is indeed the cat, does anyone here have experience with aftermarket cats? The car itself has 63k miles on it and the cats are OE. Even with the muffler delete, will the dealer honor the warranty for the cat?

Thanks for your input and advice in advance

Bimmer84 · 11-10-2011, 03:32 PM

Edit: nevermind, my post was for 335i engine only... my bad.

lawrenceon87 · 11-10-2011, 04:39 PM

anyone?

JamesM3M5 · 11-10-2011, 08:48 PM

Get all the codes from a BMW specific code scanner, then we can further discuss. Bad post cat O2 sensor can mean other things, and there may be more codes than a generic OBD scanner can find. Muffler will not affect this or void any warranty.

lawrenceon87 · 11-11-2011, 11:27 PM

got another scan done and now the p0420 code is throwing in as well. anyone have input?

e90pilot · 11-15-2011, 01:17 PM

Either both your cats died or both of your O2 sensors. Either way that's kinda strange.

11-10-2011, 03:30 PM	#1
lawrenceon87 New Member 0 Rep 25 Posts Drives: 2007 328xi Coupe Join Date: Mar 2010 Location: Kansas City iTrader: (0)	Exhaust, CEL P0430 Hey all, I had a few questions for you today and haven't been able to quite find the right answers using search. I had a muffler delete done on my 2007 e92 328xi about 2 months ago. About a week ago my CEL went off and is showing code P0430. I know that this means I have a bad post o2 or possibly a bad cat. Not sure what the problem is. I've seen a significant drop in mpg and the car likes to stay in the higher rpms while coasting or going up hill. If the problem is indeed the cat, does anyone here have experience with aftermarket cats? The car itself has 63k miles on it and the cats are OE. Even with the muffler delete, will the dealer honor the warranty for the cat? Thanks for your input and advice in advance
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11-10-2011, 03:32 PM	#2
Bimmer84 Guardian of the Night 109 Rep 1,831 Posts Drives: 2010 335i M Sport Coupe Join Date: Oct 2010 Location: San Antonio iTrader: (5) Garage List 2010 335i E92 [7.50]	Edit: nevermind, my post was for 335i engine only... my bad. __________________ 2010 335i M Sport Coupe -- Black Sapphire Metallic\|Coral Red\|Loaded\|JB4 Stage 3\|BMS DCI\|VRSF DPs\|Camaross 6k AE\|Performance Gloss Black Grilles\|CF Performance Spoiler\|CF Quad Diffuser\|Double Layer Black Chrome Quad Tips\|CF Roundels\|Smoked Reflectors\|Red Cyba Scoops\|193s Painted Lamborghini Metallic Dark Gray
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11-10-2011, 04:39 PM	#3
lawrenceon87 New Member 0 Rep 25 Posts Drives: 2007 328xi Coupe Join Date: Mar 2010 Location: Kansas City iTrader: (0)	anyone?
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11-10-2011, 08:48 PM	#4
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	Get all the codes from a BMW specific code scanner, then we can further discuss. Bad post cat O2 sensor can mean other things, and there may be more codes than a generic OBD scanner can find. Muffler will not affect this or void any warranty. __________________ RRT E92 335i/6MT with stuff and things
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11-11-2011, 11:27 PM	#5
lawrenceon87 New Member 0 Rep 25 Posts Drives: 2007 328xi Coupe Join Date: Mar 2010 Location: Kansas City iTrader: (0)	got another scan done and now the p0420 code is throwing in as well. anyone have input?
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11-15-2011, 01:17 PM	#6
e90pilot Freight Dawg 104 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Either both your cats died or both of your O2 sensors. Either way that's kinda strange. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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