08-29-2014, 05:20 PM
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#1
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Where's that bad cat?
P0430. Bad cat bank 2. If it is indeed a failing catalytic converter ( and I am not sure of this as we all know that sometimes these pesky codes are cryptic and mean that it's really somebody else's fault), which cat is to blame? Logically it would be the pre-cat as the O2 sensors are found fore and aft of that one in the model that I have. If the main cat is monitored, I don't see how.
Having found a nasty fouled and corroded O2 sensor on the aft side of the suspect pre-cat (since been changed), i fear that an oil overfill might have caused some damage.
So essentially, I would like to find a method to test the cat(s) to see where I should throw my money next!
Cheers!
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-29-2014, 05:49 PM
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#2
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Registered User
Join Date: Dec 2012
Location: FL
Posts: 4,144
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The post cat o2 sensors test the cats every time you drive. If the code doesn't come back you are all good 
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08-30-2014, 05:05 AM
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#3
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Registered User
Join Date: Dec 2012
Location: Jackson Hole, Wyoming
Posts: 800
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Whew  , I thought this was going to be another cat thread!
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08-30-2014, 05:33 AM
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#4
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Well, at least it's not about IMS or tires! 
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-30-2014, 06:10 AM
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#5
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Registered User
Join Date: Aug 2009
Posts: 1,466
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I cleared the codes on a friends car 911, 996. He had got never seize on the O2 sensor while installing post cat position this caused a heat cycle and heater fault. I forget his actual codes but if you foul the sensors they may fault and then later clear and stay clear.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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08-30-2014, 08:07 AM
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#6
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Registered User
Join Date: May 2011
Location: Miami florida
Posts: 1,591
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To check the cats, you need to plot the O2 sensor voltages. The pre cat voltage should look like a sine wave, the post cat voltage should be close to a straight line. If the post cat voltage starts to look like sine wave, then you have a bad cat.
__________________
Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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08-30-2014, 09:25 AM
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#7
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Registered User
Join Date: Sep 2013
Location: California
Posts: 466
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"Bad kitty!" - Cartman
__________________
"Blind acceptance is a sign, of stupid fools who stand in line."
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08-30-2014, 11:15 AM
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#8
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Both pre and post are in roller-coaster mode which, of course, indicates a failing cat. I changed the contaminated/corroded O2 sensor and went on a trip of about 800 miles or so over 3 days. No CEL for that period. I get back and putter around town a bit and bingo! A CEL pops up.
Looking for a used bank 2 pre-cat.
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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