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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 10-10-2019, 08:59 PM
TREYBMWS TREYBMWS is offline
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cats or 02 sensor?

BMW 528I 2008 93,013 MILES N52 PRO 01/08

1. codes p0430-p0420
1. BMW codes 29f5 -29f4
When I Clear the code it take long time for them to come back on I wanted to see if you guys think it needs cat or sensors.Or should I be looking somewhere else ?
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  #2  
Old 10-10-2019, 09:18 PM
djrynyc djrynyc is offline
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When i had those code on my e60 i change the 02 senor first and still i was getting the code. Then my cats gave in , So i change both cat ... no more code

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Old 10-10-2019, 09:20 PM
djrynyc djrynyc is offline
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When last time you change the 02 senor
..it good to change them 100k

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Old 10-10-2019, 09:24 PM
TREYBMWS TREYBMWS is offline
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Never was changed i.
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Old 10-10-2019, 09:27 PM
djrynyc djrynyc is offline
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I will start there change all 4 of them upper and lower and if the code still come back then get ready to change the cats

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Old 10-10-2019, 09:37 PM
TREYBMWS TREYBMWS is offline
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I would think it would be 02 sensors but I'm assuming It might be cats because something feels holding the car back
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Old 10-11-2019, 01:42 PM
dharmabmw dharmabmw is online now
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If you suspect the cats are clogged, then you absolutely need to change them. The back pressure will cause most of the seals to leak or worse.
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Old 10-11-2019, 01:44 PM
djrynyc djrynyc is offline
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How the car Running , you notice any lost power ?

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Old 10-11-2019, 07:33 PM
TREYBMWS TREYBMWS is offline
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This is me pushing on the gas it might just be me I own 530i it seems this is very slow or is this normal ? And the sound it is weird

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Old 10-12-2019, 06:42 AM
pshovest pshovest is offline
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Are there any other codes? If so post them. O2 sensors will leave codes. It's not impossible, but certainly unusual for a 100k mile car to have bad cats.
Upstream mixture problems can cause cat codes. Poor performance can be many things like low fuel pressure, intake air restriction.

Last edited by pshovest; 10-12-2019 at 06:47 AM.
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Old 10-12-2019, 06:55 AM
TREYBMWS TREYBMWS is offline
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Theres one code for tank ventilation that didn't come back after changing the gas cap.. I did a test plan in ista they said check for Exhaust leak then change sensors that are faulty then check cat honeycomb.
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Old 10-12-2019, 10:13 AM
Jtbgonesailing Jtbgonesailing is offline
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This is the best BMW code decoder I have found to date. http://bmwfault.codes Unfortunately both of your codes, 29f4 & 29f5 point to bad cats on bank 1 & 2.
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Old 10-12-2019, 12:21 PM
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Burning2nd Burning2nd is offline
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Catalyst System Efficiency Below Threshold bank one and two......


you need to view your live data for your O2 single.
confirm you leave close loop for open loop
confirm your intake air pressure

and then replace your cats

(*this is the result of running poor for an extended period or time)

running lean for a long time is fine,
running rich for a long time is not fine,

running with a misfire WITH fuel cut off for an extended period of time is fine,
running with a misfire for an extended period of time is not

with cut off, means the system knows its miss'n and cuts fuel (*safe) you will just burn a plug to death
running with out cut off means your dumping unburned fuel and oil

unburned carbon OR engine that does not achieve normal operation temp will burn rich and damage downstream components
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