Mercedes e350 2009 current mileage 81K, check engine light is in yellow. The service due in 25 days. Could it be set up at previous service that some engine service is recommended at 80K miles?

Don’t panic. Here are five of the most common reasons why your check engine light might have come on in your Mercedes-Benz.

Check Engine Light Mercedes-Benz

1. Gas Cap

While your gas cap might not seem like the most important piece of equipment in your Mercedes-Benz, it actually carries a pretty important role. It maintains pressure in the engine and prevents fuel vapors from leaking out. In some cases the check engine light will come on when the gas cap is not tightly replaced. We suggest that you unscrew the gas cap and re-tighten until it clicks, then allow the check engine light up to a day to reset. A loose, broken, or missing gas cap can cause your vehicle to start jerking and lower its efficiency. If the light remains on after a day, take in to the service garage.

2. Oxygen Sensor

The oxygen sensor in your Mercedes-Benz monitors the percentage of unburned oxygen in the exhaust. Over time the sensor can get covered in ash; therefore, reducing its effectiveness and leading to a decrease in gas mileage and an increase in emissions.

3. Catalytic Converter

Your catalytic converter reduces exhaust gases by converting carbon monoxide and other harmful materials into harmless ones. Most failures are down to faults with other items, but a damaged catalytic converter can mean your car will fail its emissions test.

4. Mass Airflow Sensor

The mass airflow sensor allows your car’s computer to know how much fuel is needed based on the amount of air coming into the engine. Faults can decrease efficiency, increase emissions, and cause your car to stall.

5. Spark Plugs and Wires

Spark plugs and wires are responsible for creating the original spark that initiates combustion within your Mercedes-Benz, but they can fail over time. If yours are faulty, misfires will occur.

Your Mercedes-Benz Check Engine Light is never something you should ignore. While these reasons might not sound too serious, they can develop into a much more complex issue over time. See your mechanic.

thats the service reminder your car is overdue for service

Its the service light, and its counting down the mileage to the service point, after a service it is reset with a distance till the next service. It can be reset by pushing the button for the trip reset button and hold on while you switch the ignition on, the number will rise to a preset number.

If you ask the owner for the faults he has had expect an out right lie as to nothing is wrong with the vehicle. With such low mileage better to ask why he is selling it. I suggest that the seller produces proof that he actually owns the car and is capable of selling it legally. Next take it for a good run ( not around the block) and be critical in listing all noises and problems you find. Next take it to a reputable mechanic for a frank appraisal of the faults and see what he comes up with. Any must do repairs should be deducted from the asking price as you will be stuck with that cost.. Considering the age and the listed mileage I am suspicious that the mileage has been tampered with as most cars average 15 to 25 k per year Be very cautious also because the parts supply for an 87 car has dried up and you will most likely only get second hand parts ( Panels)

its possible that is a maintance light and car is due for a service. if car was recently serviced then this light was probably not reset, it is set to change with certain mileages

Don't confuse the Check Engine Light with the maintenance or service light. These lights illuminate when a routine service is due. They are usually triggered by mileage, gallons of gasoline consumed, or some other type of vehicle-use measurement.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

It is either a check engine light due to a engine sensor fault or a service due indicator. The service due indicator will light after the required mileage or months have passed since last service, the garage will reset the light after servicing.

In your particular car have complete computerized assist plus service system, the information regarding next service your mechanic have to read by instrument cluster display, it give you workshop code for next service and all other impotent details, then your mechanic have to put it in to the Mercedes workshop information system and the system say what's the next service it's depend on mileage, over due or remain mileage over due or remain days, and service code and workshop codes, otherwise can't say what's need to be do in your particular advance car, this is the best way to protect your car, is this information helped you?

your car is over due service you will need to have service light reset its just a indcator to let you no your car is due a service.

115000 miles on a Benz is not a lot of mileage provided the car was serviced on time and properly. You might want to have someone run a scan for trouble codes to see why the light is on. It could just be a bad 02 (oxygen) sensor. Does the car run OK?