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SL/R230: Decat SL350 throwing codes.

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Old 05-04-2019, 06:38 AM
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E220d 4MATIC Estate 2018 SL350 2005
Decat SL350 throwing codes.
Hi guys,

Our SL350 (2004/10) has got stainless steel shorty headers and front cats removed. The other day the CEL came on while getting off the throttle at cruising speed, about 50mph, on a downhill slope.
Afterwards the car ran perfectly normal for the whole trip back home, no issues at all. At home I hooked up my OBD scanner and found this. As far as my knowledge reaches.. codes P0422/P0432 indicates a difference in readings between the pre/post cat O2 sensors. Correct?

Any suggestions?

Thank you.



Last edited by Mats Wesen; 05-04-2019 at 06:43 AM.
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Old 05-04-2019, 09:20 AM
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2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
You need to code out the cats otherwise you'll have codes
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Old 05-04-2019, 11:15 AM
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E220d 4MATIC Estate 2018 SL350 2005
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Originally Posted by Adi-Benz
You need to code out the cats otherwise you'll have codes
Ah, didn't know that could be done. Thanks a lot!
I'll talk to my indy and see if he can help me out, otherwise MB I assume.
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Old 05-04-2019, 08:51 PM
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2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
If you're in the US, MB won't do that because it violates emissions rules.
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Old 05-05-2019, 01:52 AM
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lol you decatted a sl350, thats a c class move bro
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Old 05-05-2019, 07:57 AM
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E220d 4MATIC Estate 2018 SL350 2005
Originally Posted by Sl600kd
lol you decatted a sl350, thats a c class move bro
You've got your car, I've got mine.. I do whatever I want with mine and I don't care what you do with your.

Heads up.. SL is capital letters.
Last edited by Mats Wesen; 05-05-2019 at 09:13 AM.
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Old 05-06-2019, 02:09 PM
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
Stay cool Mats, we’re all inhabitants of R230 country and we mock now and then.
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