Codes P0171 and P0174 indicate Bank 1 and Bank 2 are running lean. Suspect faulty oxygen sensors located underneath vehicle on exhaust system. Also inspect MAF (Mass Airflow) sensor.
Code P0304 indicate a cylinder 4 misfire detection. Need to inspect your spark plugs to ensure all cylinders are getting proper spark.
Post results and I will follow up.
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Monday, March 30th, 2009 AT 1:06 AM