C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Error code P0034

Old Mar 20, 2012 | 05:46 AM
  #1  
DaveMxxx's Avatar
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2004 C Class Coupe c200 CDi
Error code P0034

Newbee to site
Can anyone help My C200 cdi Coupe 2004 has error code P0034 and is in limp mode any ideas of what this code relates to ?
After reset of engine management runs ok for a mile or two then comes on again and goes into limp mode.
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Old Mar 20, 2012 | 01:18 PM
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phister's Avatar
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From: fort worth, tx
06 C230 SS 6spd
from researching it sounds like you might have blocked CAT. The secondary cat might have something blocking it, try removing your cats and tapping on it and see if there is small gold/silver flakes or run clean water through it to see if it runs through without restrictions.
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Old Mar 20, 2012 | 04:15 PM
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Glyn M Ruck's Avatar
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
P0034 = Turbo Charger Bypass Valve Control Circuit Low

Check out your waste gate controller.
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Old Mar 21, 2012 | 11:16 AM
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2004 C Class Coupe c200 CDi
Thank you guys for the info soon as I get back will give them a try and post results
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