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1993 Mercedes-Benz 500SEC

Closing Assist/Door Lock Issues Due to Pneumatic System Problems

Verified for the Mercedes-Benz 500SEC

Problems with the pneumatic system can cause closing assist and door lock issues.

2 Reports

Squeaking/Worn Brake Pads May Require Rotor Replacement Also

Verified for the Mercedes-Benz 500SEC

The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors.  The brake rotor surfaces become uneven, causing a lip to form at the outer edge. This will generally require replacement of the rotors when the pads are worn (pad life varies depending on driving style and terrain).

1 Report

Throttle Valves May Experience Electrical Failure

Verified for the Mercedes-Benz 500SEC

The electronic throttle assembly may suffer an electrical failure. It is often cheaper to send the valve to a service center for repair that to purchase a new part.

1 Report

Engine Oil and Coolant Leaks Resulting in Fulid Intermix

Verified for the Mercedes-Benz 500SEC

Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.

1 Report

Emissions-related ports in cylinder head may clog

Verified for the Mercedes-Benz 500SEC
Ports in the cylinder head related to the emissions air injection and EGR systems can clog; the cylinder head should be removed and the ports cleaned.
1 Report

Excess Free Play in Steering and/or Alignment Issue

Verified for the Mercedes-Benz 500SEC

One or more of the following steering linkage components may wear prematurely;  tie rod ends, drag link, or idler arm. Our technicians remind us the wheel alignment should be checked and adjusted if any of these items are replaced.

1 Report

High Usage Vehicles May Experience Ignition Lock and Tumbler Failures

Verified for the Mercedes-Benz 500SEC

Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.

1 Report

ABS Modulator Failure Due to Dirty Brake Fluid

Verified for the Mercedes-Benz 500SEC

As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to help prevent this issue.

1 Report

Power Window May Fail Due to Window Regulator

Verified for the Mercedes-Benz 500SEC

One or more door windows may stop working due to a failed window regulator. Replacement of the failed regulator will be necessary to correct this concern.

1 Report

Cracked Driveshaft Flex Discs May Cause Driveshaft Movement/Vibration

Verified for the Mercedes-Benz 500SEC

A vibration felt through the center floor of the vehicle can be caused by cracked and/or shredded driveshaft flex discs, resulting in excessive driveshaft movement. If not repaired, damage to the driveshaft center support bearing, transmission, or differential can occur.

1 Report

Head Light Lenses Become Cloudy/Opaque

Verified for the Mercedes-Benz 500SEC

Due to exposure to the sun, lenses for head lights may become opaque (cloudy or hazy). This reduces the effectiveness of the lights. Our technicians tell us plastic polishes can improve the clarity of the lenses, but replacement of the lamp housings is the only way to regain the full intensity of the lights.

1 Report

Instrument cluster lenses may break

Verified for the Mercedes-Benz 500SEC

Instrument cluster lenses break easily.

1 Report

Glove box hinges, center console arm rest, and cup holders may break

Verified for the Mercedes-Benz 500SEC
Glove box hinges, the center console armrest, and the cup holders break.
1 Report

Coolant Leak/Overheating Due to Radiator Leak

Verified for the Mercedes-Benz 500SEC

A coolant leak may develop form the Radiator due to degradation of its plastic components. Replacement of the failed radiator will be necessary.

1 Report

Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor

Verified for the Mercedes-Benz 500SEC

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

1 Report

Transmission Oil Seals May Leak on High Mileage Vehicles

Verified for the Mercedes-Benz 500SEC

High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.

 

1 Report

Premature Tire Wear Due to Cracked Lower Control Arm Bushings

Verified for the Mercedes-Benz 500SEC

The lower control arm bushings can wear and crack, resulting excessive movement at the control arm pivot point, leading to irregular and premature tire wear. Worn Ball joints can also cause similar tire wear symptoms. I some cases it may be necessary to replace the lower control arm, including bushings & ball joint to correct this concern.

1 Report

Coolant Hoses May Fail Unexpectedly

Verified for the Mercedes-Benz 500SEC

The cooling system hoses may fail unexpectedly. The hoses can look good on the outside, but the rubber can degrade and erode on the inside. If not carefully checked, the hoses can burst at any time.

1 Report

Climate Control System Problems Due to Wear in Climate Control Buttons Contacts

Verified for the Mercedes-Benz 500SEC

The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly required to correct this problem.

1 Report

Harsh Ride From Rear Due to Failed Dampening Actuator

Verified for the Mercedes-Benz 500SEC

Vehicles with automatic level control that ride harshly in the rear (no give in the suspension) may have one or both dampening actuators which have failed. It is commonly recommended the actuators be replaced in pairs.

1 Report

Fluid Leak From Front of Vehicle

Verified for the Mercedes-Benz 500SEC

A worn steering dampening shock can cause a fluid leak at the front of the vehicle. If a leak is noted from the dampening shock, our technicians tell us that it should be replaced.

1 Report

Coolant Leak Due to Cracked/Broken Heater Core Outlet Housing

Verified for the Mercedes-Benz 500SEC

A cracked or broken heater core outlet housing can cause a coolant leak near the bulkhead (firewall). Our technicians remind us that coolant leaks should be repaired in order to avoid overheating the engine due to coolant loss.

1 Report

Shifter Lever Bushings May Break Causing Loose Feel/Noise

Verified for the Mercedes-Benz 500SEC

The bushings for the shifter lever wear out to the point where they break and fall out. This causes excessive movement (loose feel) in the shifter lever and a clanging-type noise when changing gears.

1 Report

Poor idle quality due to oil feed tubes falling into crankcase

Verified for the Mercedes-Benz 500SEC
Oil feed tubes break and fall into the crankcase (engine) and the tappet becomes noisy (ticking), resulting in degraded idle quality. Our technicians recommend replacing all of the tubes at the same time, broken or not.
1 Report

Automatic car washes can damage head lamp wipers

Verified for the Mercedes-Benz 500SEC

The head lamp wipers are easily damaged, especially by automatic car washes.

1 Report

The Differential May Develop Leaks From the Seals or Cover

Verified for the Mercedes-Benz 500SEC

Leaks may develop from the differential seals and/or cover on older or high mileage vehicles. Our technicians recommend a complete reseal of the differential unit when these leaks are addressed.

1 Report

Erratic Engine Operation and Poor Fuel Economy Due to Faulty Mass Air Flow Sensor

Verified for the Mercedes-Benz 500SEC

A faulty mass air flow (MAF) sensor can cause erratic/rough engine operation and fuel economy issues. Since this sensor measures the actual amount of air entering the motor, when it fails, the engine control module (ECM) takes the wrong information and delivers incorrect volumes of fuel to the cylinders.

1 Report

Tandem Hydraulic Pumps May Leak From Either Section

Verified for the Mercedes-Benz 500SEC

Some models have tandem hydraulic pumps—one section for power steering and the other for suspension adjustment. These pumps are prone to leakage from either section.

1 Report

Poor AC Performance Due to Refrigerant Loss

Verified for the Mercedes-Benz 500SEC

A refrigerant leak may develop from one or more of the following AC components: AC compressor, hose manifold for the compressor, or the evaporator core. The loss of refrigerant can cause poor AC performance. Our technicians tell us that proper leak diagnoses should be performed in order to determine the cause of any refrigerant loss.

1 Report

Electrical Issues Due to Degraded Engine Wiring Harness

Verified for the Mercedes-Benz 500SEC

The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.

1 Report
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