NHTSA Office of Defects Investigation
Preliminary Evaluation PE07-021: FRONT SUSPENSION COIL SPRING EJECTION
- Closed
NHTSA's Office of Defects Investigation opened Preliminary Evaluation PE07-021 on April 19, 2007 and closed it on August 9, 2007. NHTSA's investigations file lists 4 Mercedes Benz models for it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- PE07-021 (also written PE07021)
- Investigation type
- Preliminary Evaluation The first stage of most defect investigations: NHTSA's Office of Defects Investigation gathers basic information about a possible safety defect, including from the manufacturer.
- Status
- Closed August 9, 2007
- Opened
- Closed
- Vehicle or equipment manufacturer
- Mercedes-Benz USA, LLC
- Component
- Suspension — Front — Springs — Coil Springs
- Vehicles and equipment
- 4 Mercedes Benz models, including the E320 and E Class
A recall appears here only when NHTSA's investigations file links one to the investigation; NHTSA's summary or record can name others.
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Preliminary Evaluation PE07-021.
ODI HAS FOCUSED THIS INVESTIGATION ON ASSESSING THE RISKS POSED BY A SEPARATED SPRING AS (1) A ROAD HAZARD AND (2) THE POTENTIAL FOR VEHICLE CONTROL TO BE COMPROMISED AFTER THE FRONT COIL SPRING HAS BEEN EJECTED FROM ITS INTENDED POSITION IN THE VEHICLE.BOTH RISKS ARE ASSOCIATED WITH CORROSION, FLEXING, AND FRACTURE OF THE UPPER FRONT SUSPENSION MOUNTING BRACKET.TIME-IN-SERVICE FAILURE RATES ARE NOTABLY HIGHER IN SALT BELT STATES SINCE CORROSION IS A PRIMARY CONTRIBUTOR TO THE FAILURE MODE.SINCE A NUMBER OF INCIDENTS HAVE OCCURRED WHILE THE VEHICLE WAS BEING OPERATED, ODI IS SKEPTICAL THAT OWNERS CAN ALWAYS DETECT THE SUBTLE SIDE TO SIDE DIFFERENCE IN RIDE HEIGHT AND/OR INSPECT OR NOTICE THAT THE UPPER SUSPENSION BRACKET HAS BEEN COMPROMISED BY CORROSION.(1) ROAD HAZARD - ALTHOUGH THE (APPROX. 7 LB.) FRONT SUSPENSION SPRING THAT MAY BE EJECTED AT HIGHWAY SPEEDS COULD POSE A SERIOUS ROAD HAZARD TO PEDESTRIANS AND OTHER VEHICLES, THE OCCURRENCE RATE HAS BEEN LOW (.03% BASED ON 51 REPORTED INCIDENTS OCCURRING AND AN INITIAL POPULATION OF 172,781 VEHICLES AFTER 9 - 12 YEARS OF USE / EXPOSURE) AND THERE ARE NO KNOWN INJURIES, FATALITIES, OR PROPERTY DAMAGE REPORTS DUE TO AN EJECTED SPRING.ALSO, MANY OF THE 51 INCIDENTS OCCURRED AT LOW SPEED OR WHILE THE VEHICLE WAS STOPPED OR PARKED.(2) VEHICLE CONTROL - VEHICLE HANDLING AND CONTROL COULD BE AFFECTED BY THE FRACTURE OF THE UPPER SUSPENSION MOUNT AND/OR THE ASSOCIATED SPRING EJECTION.ODI FIRST IDENTIFIED ITS CONCERN ABOUT CORROSION IN THE UPPER SUSPENSION BRACKET OF SUBJECT VEHICLES IN 2002, AT WHICH TIME MERCEDES PROVIDED A VIDEO THAT SHOWED THAT A VEHICLE COULD BE STEERED, STOPPED, AND CONTROLLED THROUGH VARIOUS MANEUVERS AT HIGH SPEEDS WITH A FRONT COIL SPRING COMPLETELY MISSING FROM THE VEHICLE. DURING PE07-021, IN ADDITION TO REVIEWING THE 2002 VIDEO-TAPE, ODI ENGINEERS DROVE AN EXEMPLAR VEHICLE WITH THE SPRING REMOVED AND SIMULATED VARIOUS COMBINATIONS OF STEERING ANGLES TO ASSESS WHETHER THERE WERE ANY POSSIBLE CONDITIONS / DISPLACEMENTS IN WHICH THE SEPARATED SPRING MIGHT INTERFERE WITH THE WHEELS. IN A VEHICLE WITH THE FRONT SPRING REMOVED, THE TOP OF THE WHEEL CAN LIGHTLY CONTACT THE BOTTOM AREA OF THE WHEEL FENDER DURING HIGH ANGLE TURNS TYPICALLY ASSOCIATED WITH SLOWER SPEED MANEUVERS SUCH AS CITY DRIVING. THE LIGHT TIRE CONTACT GENERATED AN OBVIOUS GRINDING NOISE AND WOULD LIKELY ABRADE OR BEND THE EDGE OF THE FENDER WITH CONTINUED USE.HOWEVER, THE EXTENT OF THE INTERFERENCE WAS NOT SUFFICIENT TO AFFECT VEHICLE STEERING AND DOES NOT OCCUR AT SMALLER TURNING ANGLES ASSOCIATED WITH HIGHWAY DRIVING.ODI HAS NOT IDENTIFIED A SAFETY RELATED DEFECT TREND AT THIS TIME.FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING THAT A SAFETY RELATED DEFECT DOES NOT EXIST.THE AGENCY RESERVES THE RIGHT TO TAKE FURTHER ACTION IF FUTURE CIRCUMSTANCES WARRANT.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Preliminary Evaluation PE07-021. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. Model years with a try.vin recall page link to that page's NHTSA investigations section.
What an NHTSA investigation is
NHTSA's Office of Defects Investigation (ODI) looks into possible safety defects in vehicles and equipment, often after owner complaints. An investigation usually starts as a Preliminary Evaluation, or as a Recall Query when it concerns whether an existing recall covers the right vehicles or fixes the problem, and ODI can upgrade it to a more detailed Engineering Analysis. A Defect Petition asks NHTSA to open an investigation, and Audit and Equipment Queries are administrative investigations into whether companies complied with federal vehicle safety requirements, such as reporting, recall and certification rules.
An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.
To see whether a specific vehicle has an open recall, enter its VIN at nhtsa.gov/recalls.
Mercedes Benz VIN check: decode a VIN to see its year, make and model.
Sources
NHTSA's investigation record for PE07-021
Investigation details come from NHTSA's investigations file, which try.vin imports once a day. The investigation types are described from the U.S. Department of Transportation Inspector General's May 2023 report on NHTSA's Office of Defects Investigation, NHTSA's petition rules (49 CFR Parts 552 and 557) and NHTSA's Office of Defects Investigation procedures. How try.vin reads NHTSA investigations.