RepairPal has identified the most common problems as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.Refine by vehicle
If you experience cold starting problems, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steadily and run when the accelerator pedal is not pressed.
The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.
The passlock sensor in the ignition lock cylinder may fail causing an anti-theft system fault and a no start condition. Our technicians tell us that the ignition lock cylinder should be replace to correct this condition.
The rear window defogger may stop working due to a wire terminal broken off of the rear glass. Our technicians tell us that terminal can be reattached using a special glue or silver solder.
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.
The engine may develop an oil leak from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.
An engine oil leak may develop from the front crankshaft seal. Our technicians tell us a revised front crankshaft seal is available to correct this concern.
Illumination of the Check Engine Light may be the result of a loose or worn gas cap.
The fuel level sensor may fail resulting in erratic fuel gauge operation and illumination of the Check Engine Light. Replacement of the fuel sender assembly is recommended to correct this concern. A powertrain control module (PCM) software update may be necessary for the updated fuel level sensor to read correctly.
The exterior door handles may break requiring replacement.
The engine in the R350 is known by Mercedes Benz to have issues due to a poorly manufactured gear on the balance shaft (also known as the counter-rotating assembly). Since the balance shaft gear is driven by the timing chain, which keeps the engine rotating synchronously, when it fails, the timing of the engine will change causing:
-Illumination of the Check Engine Light
-Rough Running Conditions
-Loud Rattle or Slapping Noise
-OBD Trouble Code P1200 and P1208
Correction for this issue is replacement of the balance shaft, or balance shaft gear. Replacement of the timing chain and tensioner should be done as well. The Mercedes Benz dealer may cover some or all of the repair cost on select vehicles as a result of a class action settlement.
Engine overheating can result from coolant leaks which are commonly found at the thermostat housing gasket, water pump, heater return tube O-ring at the water pump, intake manifold gasket, and timing cover gasket. Our technicians recommend a complete inspection of the cooling system after any repairs are made to be sure there are no other leaks.
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The speedometer or other instrument panel gauge may begin to work erratically at times. Our technicians tell us that the instrument cluster must be sent to a repair facility to correct this fault.
Some engines may experience a brief knocking or rattle on cold start up. Our technicians tell us replacing the camshaft timing gear assembly with upgraded parts will generally correct this concern.
A burning smell may develop due to an oil leak form one or both valve cover gaskets. Resealing the valve cover will generally correct this concern. However, the valve covers should be inspected and replaced if damaged.
Many electrical problems can be caused by a failing Body Control Module or BCM. Before replacing, the system should be properly diagnosed to verify there are no other issues, such as electrical shorts or other failing modules. Remedying the condition requires replacement and programming of the Body Control Module.
A lack of power may develop due to a failed turbocharger. Failed turbochargers will require replacement to restore engine power.
The engine may develop a ticking noise from the front of the engine due to a worn timing chain. Our technicians tell us that replacing the timing chain and related component will generally correct this issue.
Toyota issued a recall on the lower ball joint due to the possibility of premature wear from improper finishing in production. The ball joints will be replaced under the recall. This recall applies to 2001-2004 models only. Please contact you local Toyota dealer to see if your vehicle is included.
The timing chain tensioner is designed to use oil pressure to keep tension on the timing chain. When it develops a leak, it can no longer provide tension, and the timing chain will begin to make a slapping or rattling sound at all times.
If left in this condition, the timing chain may fail, leading to costly internal engine repair.
To correct this issue the timing chain tensioner must be replaced with the revised part.