E90 320i - Error code P1128 / Poor acceleration / check engine light on / service car

F1ProjectOne · 10-11-2020, 04:11 AM

Hi, has anyone encountered this error code on their car before and the following issues: The car cruises fine at low rpm and no rough idle or suspicious sound from the engine at idle. However under hard acceleration, power is definitely lacking, it should do 0-60mph in 9s but it now takes 14s-15s. CEL is on, Service car message on the display and Error code P1128 (Bank1, Mixture Adaption (mult.) System Too Lean ) appears as well. Would really appreciate any opinion on what you guys think is faulty and needs to be replaced?

drymite · 10-13-2020, 02:27 AM

Quote:

Originally Posted by F1ProjectOne

Hi, has anyone encountered this error code on their car before and the following issues: The car cruises fine at low rpm and no rough idle or suspicious sound from the engine at idle. However under hard acceleration, power is definitely lacking, it should do 0-60mph in 9s but it now takes 14s-15s. CEL is on, Service car message on the display and Error code P1128 (Bank1, Mixture Adaption (mult.) System Too Lean ) appears as well. Would really appreciate any opinion on what you guys think is faulty and needs to be replaced?

Check for a vacuum leak

10-11-2020, 04:11 AM	#1
F1ProjectOne Registered 0 Rep 1 Posts Drives: BMW 3 series E90 320i Join Date: Oct 2020 Location: Brisbane iTrader: (0)	E90 320i - Error code P1128 / Poor acceleration / check engine light on / service car Hi, has anyone encountered this error code on their car before and the following issues: The car cruises fine at low rpm and no rough idle or suspicious sound from the engine at idle. However under hard acceleration, power is definitely lacking, it should do 0-60mph in 9s but it now takes 14s-15s. CEL is on, Service car message on the display and Error code P1128 (Bank1, Mixture Adaption (mult.) System Too Lean ) appears as well. Would really appreciate any opinion on what you guys think is faulty and needs to be replaced?
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