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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 01-07-2009, 11:42 PM
nzle39 nzle39 is offline
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Location: New Zealand
Join Date: Jan 2009
Posts: 2
Mein Auto: 1997 BMW 525i E39
Check Control - "Slow! Cat. Overheat"


I have recently purchased a 1997 E39 525i and the check control message:


Comes up when I start the car. Does anyone know what this message means and what I can do to fix it? Is it a serious issue?

Thanks for your help.

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Old 01-08-2009, 12:04 AM
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kingdunke kingdunke is offline
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Location: los angeles
Join Date: Nov 2007
Posts: 750
Mein Auto: 02 530iA Sport Jan/02 mfg
could it be caused by misfiring so that some unburned gas air hot mixture is going thru the headers then the cat? did check engine light come on?
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Old 01-08-2009, 12:07 AM
nzle39 nzle39 is offline
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Location: New Zealand
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Mein Auto: 1997 BMW 525i E39
The error was present when I got the car...since I have owned (a month now :-) ) it the check engine light has never come on and I don't think it has ever misfired on me.
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Old 01-08-2009, 07:09 AM
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doru doru is offline
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Location: Calgary
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Mein Auto: 2003 530iA
Maybe something with post cat O2 sensors?
Try to have the code(s) read. It might point you in the right direction. If the car drives and pulls OK, I believe the catalitic converter & the post cat O2 sensors might be gone.
Looking for a DIY? Parts? Check this out, it might be your ticket
TMS underdrive pullies - Stewart WP - PSS9 - Beisan Vanos seals - Zimmerman cross-drilled & Akebono Euro - Deka 649 MF - 55w HID headlights - 35w HID foglights - Hualigan double din - ACS (rep) alu pedals - Euro central storage console - Breyton Magic Racing staggered wheels - M5 bumper - M5 steering wheel - Tint
Stable: e39, e53, e46 & Tribby
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Old 08-16-2014, 08:17 PM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
Posts: 24,951
Mein Auto: 02 BMW 525i M54 auto 130K
See also:
> E39 (1997 - 2003) > List of all possible BMW E39 instrument cluster text warnings & text messages
And, in this recent SLOW! CAT. OVERHEAT canonical thread:
> E39 (1997 - 2003) > Possible Catalytic Converter
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 08-17-2014 at 09:01 AM.
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