There are 1 stored owner reports matching the engine leading-label group for the 2004 Lexus LX in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 1 of 1 matching reports.
Open the full vehicle complaint log (all categories)CHECK ENGINE ON WITH CODE P0171. THE CODE HAS BEEN ON FOR OVER 6 MONTHS WITHOUT ANY CAUSE/REASON. I HAVE WORKED WITH LEXUS AND FOLLOWED RECOMMENDATIONS FROM LEXUS WITHOUT ANY SUCCESS OF RESOLVING IT. LEXUS TOOK A FUEL SAMPLE IN AUGUST 2010 AND I HAVE NOT RECEIVED ANY RESPONSES FROM LEXUS AS OF NOV. 15, 2010. SINCE THE "CHECK ENGINE" LIGHT HAS BEEN ON REGARDLESS SINCE FEB. 20, 2010, THE FUNCTION OF "CHECK ENGINE" LIGHT IS LOST. THIS IS A SAFETY HAZARD AS THE DRIVER WILL NO LONGER RECEIVE ANY WARNING OF ANY REAL POTENTIAL PROBLEM WITH THE VEHICLE. UPDATED 01/20/11 *BF THE CONSUMER WAS INFORMED THE OXYGEN SENSOR NEEDED TO REPLACED. HOWEVER, THE CHECK ENGINE LIGHT ILLUMINATED AGAIN. THE DEALER HAS BEEN UNABLE TO PINPOINT THE PROBLEM.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Aug 30, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.