Possible causes
– Faulty Oxygen sensor
– Ignition problem
– Fuel injection problem
– Engine mechanical condition
– Ignition problem
– Fuel injection problem
– Engine mechanical condition
Tech description
There is a factory service bulletin for the following Buick models:
2000-2008 Buick Century
2000-2008 Buick LeSabre
2000-2008 Buick Park Avenue
2000-2008 Buick Regal
2002-2008 Buick Rendezvous
2000-2008 Buick Factory Service Bulletin OBDII Code P1174
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1174 BUICK OBD Code Description
The Engine Control Module (ECM) performs a fuel trim cylinder balance utilizing the HO2S, when the calculated accumulated voltage exceeds a predetermined level this code is set