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W212 AMG Discuss the W212 AMG's such as the E63

Turbo Underboost Code

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Old Aug 14, 2019 | 11:25 AM
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DesiredNameTkn's Avatar
DesiredNameTkn
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2016 W212 e63 Wagon
Turbo Underboost Code
2019 M157 with Stage 1 Eurocharged ECU flash tune and 2nd cat delete. Getting intermittent CEL throwing P0299 code. Occurs even when I flash the ECU back to stock. Car does not feel underpowered or drive differently when light is on. Took in to the dealer but CEL was off (of course). Per SA turbos and exhaust all looked good. I used the code reader to clear the code, but it comes back. Anyone have ideas?

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Old Aug 14, 2019 | 12:02 PM
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
Don't you need a tuner to code out the CEL from the egr fault if you have cat delete?

alternatively you have a turbo leak and they haven't found it yet
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Old Aug 14, 2019 | 02:58 PM
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E63
Boost solenoid or the vacuum hose that goes to the solenoid
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Old Aug 15, 2019 | 03:33 AM
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2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
Originally Posted by kponti
Boost solenoid or the vacuum hose that goes to the solenoid
^^^^ This is 99% is the cause.
Been there before.
Or one of the vacuum hoses is cracked.
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