C63 AMG (W204) 2008 - 2015
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P2097

Old Jun 18, 2018 | 09:47 PM
  #1  
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C63 p31 coupe, Clk550 cab, M3 coupe, LS430, 750LI
P2097

Sup fellas, lately I've been getting a CEL. P2097 is the culprit. Ive tried searching but nothing on that specific code. I've erased code twice and it stays off for about 200-300 miles. I noticed it started doing it when I drive the car in C, like a little bi.... Car has arh catted lth with cheapish post o2 spacers and EC V7 tune with rear o2 left on. Do you guys think its tune related or should I get better o2 spacers, probably some honeycomb ones. Want to get this sorted out before I install EC Flex Fuel Kit with 550cc injectors. As always thanks in advance.
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Old Jun 18, 2018 | 10:28 PM
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Generic code means

P2097 – Post catalytic converter fuel trim (FT), bank 1 – too rich

so bad O2, oil fouled O2 or maybe your spacers like you said but O2 appears to be reporting too much fuel post cat.

my 335i throws the same code with the high flow cats if not suppressed.
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Old Jun 18, 2018 | 10:40 PM
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C63 p31 coupe, Clk550 cab, M3 coupe, LS430, 750LI
Originally Posted by roadkillrob
Generic code means

P2097 – Post catalytic converter fuel trim (FT), bank 1 – too rich

so bad O2, oil fouled O2 or maybe your spacers like you said but O2 appears to be reporting too much fuel post cat.

my 335i throws the same code with the high flow cats if not suppressed.
Thanks. I'll try better spacers that act like mini cats. Then I'll try new new o2s if that doesnt work.
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Old Jun 18, 2018 | 10:58 PM
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Are you running extension wires on the rear o2s?
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Old Jun 18, 2018 | 11:04 PM
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C63 p31 coupe, Clk550 cab, M3 coupe, LS430, 750LI
Originally Posted by skratch77
Are you running extension wires on the rear o2s?
Yeah, the ones supplied in the ARH kit.
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Old Jun 18, 2018 | 11:12 PM
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Originally Posted by SactownP31
Yeah, the ones supplied in the ARH kit.
you will never pass with wire extensions. I have been there and done that.

need to have bungs welded close enough to not need longer wires and you will pass even with no cats using o2 spacers.
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Old Jun 18, 2018 | 11:20 PM
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C63 p31 coupe, Clk550 cab, M3 coupe, LS430, 750LI
Originally Posted by skratch77
you will never pass with wire extensions. I have been there and done that.

need to have bungs welded close enough to not need longer wires and you will pass even with no cats using o2 spacers.
No shyt, so its the extension that are causing the CEL? Good to know.
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