I Drove My 97 Mercedes E420 When I Tried to Start It Again Now It Wont Start

Mercedes won't start or turn over? Are y'all experiencing Mercedes-Benz no beginning issues?  Central won't turn at all? Engine turning over just the car will non start? Perchance it finally starts, runs for a few seconds and so dies. These are common Mercedes-Benz starting problems.

This comprehensive step by step guide is written to aid y'all with Mercedes-Benz no start issues. While in few cases troubleshooting past a professional person is required, there are several test that you lot tin perform yourself to avoid a repair bill.  In guild for your Mercedes-Benz to showtime there are several conditions that demand to exist met and also needs:

1. Start enable past Drive Authorization System
2. Information technology requires electrical ability to crank the engine.
3. Requires fuel
4. Requires spark

Peak 5 Mercedes-Benz no start problems

• Engine Click, No Start

• Engine Dies Right Afterwards It Starts

• Car turns over, but it won't start

• The car makes a clicking noise but won't start. Hint: Starter Trouble or Depression Battery

• Fundamental will non plow the ignition

Step 1: Verify that bombardment is fully charged

This may seem obvious, but an former battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the battery on your Mercedes-Benz?

While some MB owners take pushed over ten years on an original battery, the battery should exist considered for replacement effectually 6 or seven years. If you lot have an sometime battery replace it before you motion to the next troubleshooting pace. If you want to save on the toll of the battery, head over to Amazon and cheque out these batteries that fit Mercedes-Benz. They toll much less than the battery you purchase at the dealership. You can c heck cost and read reviews for multipleMercedes-Benz AGM Grouping 94 Batteries that volition fit your Mercedes-Benz.

You lot know yous have a relatively new battery. You get to beginning your Mercedes-Benz and y'all either hear information technology turn over one time or hear several clicks as in this video.

This Mercedes-Benz is not starting considering of a depression battery. In this example, what you demand to do is trickle charge your battery using any of these 12 volt battery trickle chargers. If you demand help read this article on How to charge a Mercedes-Benz the right style.

Stride 2: Check fuses and relays

Mercedes won't start, and it's non the battery.

Next, yous should check the fuses on your car.

Y'all would want to check fuses for systems such every bit: Starter Circuit, Ignition, EIS, Fuel Pump. There could be more than circuits that impact the starting depending on the model. Yous tin can easily cheque all the fuses if you are not sure, to make sure none of them are not burned out. Keep in mind that fuses are there to protect systems when they malfunction. Make sure to replace the fuse with the same ampere rating fuse. In that location is a chance the fuse could blow proceeds, shortly after that.

To exam the fuses, you lot tin can utilise whatsoever digital multimeter to easily and quickly check the fuses without removing them. In the video tutorial beneath we used Mastech AC/DC Digital Multimeter.

Read DIY Tutorial: How to check all fuses on a Mercedes-Benz, the easy fashion.

Step iii: Bank check Gear Selector / Brake Light Switch

The brake light switch is a common culprit and often fail on Mercedes-Benz cars. The Drive Potency System will not allow starting the car if the brake light switch is non working properly. In some cases, you lot will notice this problem because you tin can't go the machine out of park. Gear shift stuck is i of the most mutual bug with Mercedes-Benz cars. Unfortunately, looking to run across if the restriction lights turns on while you press the brake pad, is not a good test to tell if the brake light switch is working properly. This is considering the brake light switch has ii or more micro-switches inside and merely one of them controls the rear brake lights.

Another way to verify if the gear selector module is working properly is to look at the instrument cluster. Now, as you lot movement the shifter from Park to Reverse to Neutral, do you lot see the gear indicator likewise change on the instrument cluster? If you don't run across the letters on the cluster change from P to R to N, it is a proficient sign that the gear selector module is lacking. You can purchase a new brake calorie-free switch on Amazon for less than $15 USD, simply practice a search forMercedes-Benz Restriction Light Switches. In the video below you will tin can see how easy it is to supervene upon the brake light switch on a Mercedes-Benz E-Class. The procedures are very similar for other Mercedes-Benz models such as CLS, S, C, ML, R-Grade.

Read DIY Article: How to supersede the brake low-cal switch on any Mercedes-Benz. If you lot replaced the brake light switch and your motorcar won'tstart motility on to Step 4.

Step 4: Fuel Problems, Mercedes Won't Get-go

Is the engine turning over? Allow'due south eliminate the possibility of a fuel arrangement issues. Troubleshooting fuel related problems is not very difficult and you tin can bank check the fuel pressure level yourself. Checking the fuel force per unit area is very simple.

For this test, you lot volition demand a fuel pressure gauge. What yous need is a fuel pressure level gauge with Schrader valve adapter. A slap-up and affordable estimate that we have used in the past is this Actron Fuel Pressure Gauge which works on Mercedes-Benz cars. Turn the engine off and connect this approximate to the Schrader valve test port shown in the moving picture below. Start the automobile and you should be able to get around 60 psi. When the engine is running and when you plough off the engine the force per unit area should stay steady. Always perform this test on a cold engine.

Adjacent, make sure that the fuel injector connections are secure and not loose.

Cheque the fuel pump and the fuel pump relay. In some Mercedes-Benz models you will be able to hear the fuel pump when you lot mind carefully near the fuel tank. While one of your friends turn the key to position Ii, all dash lights on just car is non started; heed advisedly at these locations.  Under or behind the rear seat, mind within the trunk nigh the back of the back seat, heed through the fuel fill with the fuel cap removed. The fuel pump should run for several seconds every fourth dimension yous turn the key to position II.

Also check the fuel filter. Make sure that it is former and clogged. They can be hands replaced in most cases and don't cost very much.

Stride five: Check engine fault codes

If your Mercedes-Benz starts and dies and then another thing that you tin can practise is retrieve the fault codes.

An iCarsoft MB II or Launch Creader Vii+ will be all that you need to retrieve fault codes.

These 2 scanners will pull the fault codes from the ECU but also from TCU, SRS, ESP, ETS, BAS and several more than control units.

If yous demand help on how to use an OBD II scanner to retrieve the fault codes read this article : How to check the fault codes on a Mercedes-Benz

Pace 6: Starter Motor Problems – Mercedes won't plow over

If the starter is defective y'all will not exist able to become the engine to turn. First check the starter fuse. Often times, when the starter is defective or seizes up it volition accident out the fuse that protect the starter circuit. Some other thing that yous can try is to striking the starter with a prophylactic hammer a couple of times.

Depending what kind of starter bug you have, the starter may work a few more times. Even if the starter begins to work again, consider replacing it, every bit it is nearing the stop of its life.

If you lot come to the conclusion that the starter is the problem read this commodity on:How to Replace a Starter on a Mercedes-Benz.

Pace seven: Ignition arrangement, Spark Plugs/Coils – Mercedes starts and so dies

If your car cranks but information technology does not showtime there are two things that you should check offset. 1 is that there is fuel and 2d that there is spark. Checking for spark is very piece of cake if you have an In-Line Spark Test Tool.

As you volition come across from the link, those tools are very cheap and a great tool to check for spark. You remove the spark plug boot from one of the spark plugs and install this tool in line. Crank the car and notice the spark plug test tool.

Read DIY Guide: How to replace the spark plugs on a Mercedes-Benz

Step 8: Check Crankshaft position sensor – Crank No Start

If the crankshaft position sensor fails you may experience crank and no beginning symptoms. In this video below you will encounter a Mercedes-Benz that refuses to start due to a failed crankshaft position sensor.

When the crankshaft position sensor fails you lot may notice the following symptoms:

• Check engine low-cal is on.
• Intermittent starting
• Misfiring
• Hesitation
• Engine vibrations
• Engine stall

In this Video you car see a Mercedes-Benz that cranks but won't commencement do to failed crankshaft position sensor.

Don't panic though. Replacing the crankshaft position sensor is piece of cake and the sensor is very cheap. Read this detailed article on how to replace the crankshaft position sensor on most Mercedes-Benz V6 and V8 engine.

Step 9: Driver Authorization System / Primal won't plow in igntion

The car may not start if y'all have a newer car with a SmartKey due to Driver Authorization System (DAS) failure. The newer keys have a transponder integrated in them. The key pull a fast one on remote serves 2 purposes. Offset it disables the anti-theft system when yous unlock the car. Second, Drive Authorization Organisation verifies the key to make sure it is the right key to commencement the automobile.

If your key does not plow the ignition, there are ii things that are the most likely scenarios: The bombardment is fully or partially discharged. This doesn't permit the electronic ignition system (EIS) to function at all. Make sure to verify that you don't have a defective bombardment trouble. Second, the Commuter Authority related issues. When yous insert the key into the ignition, the central is verified and authorized to start the car.

One time the key is authorized the steering column is unlocked and the Engine Control Unit of measurement is allowed to start the engine. Replacing the electric ignition module (EIS) can but be performed past the dealership and typically costs over $m-$2500. Continue in listen that the central can often be the problem and non the DAS or EIS. And then if yous have a spare key, endeavor that commencement before you supervene upon the EIS. Keys practice go bad more frequently than EIS modules do.

Step ten: Other possible problems – Mercedes-Benz will non beginning

The list tin go on and on equally to what can cause a Mercedes-Benz to not start. If you cheque all of the things above you have washed near of the work. For this last step you will need a professional diagnostic scanner. Our superlative  recommendation in this case is theAutel DS708 Professional Scanner, powerful scanner that works on most makes and models.

Once you hook up a professional OBD Two scanner to the OBD-Two port of your car, yous volition be able to scan multiple systems on your machine to find out what is causing the problem.

Here are a few other items that may prevent your Mercedes-Benz from starting. In near cases you volition go a fault code related to 1 of the post-obit:

• ECM / PCM computer failure
• Camshaft position sensor
• Shifter Selector module
• Fault codes related to driver authorization or immobilizer
• Electrical bug

In rare cases, you lot may besides accept a locked upwards engine due to lack or oil or hydro lock. Low compression or blown caput gasket tin can also crusade a Mercedes-Benz automobile non to start but are non very common bug.

We hope this guide helped you start your Mercedes-Benz. As you perform these exam be careful to avert injuries to yourself and amercement to yourself. If you lot don't feel comfortable with some of these test, it's improve to take your motorcar to an auto repair shop.

Related Terms	Mercedes-Benz Models
Mercedes-Benz Non Starting Why is my motorcar not starting Why isnt my machine starting Car not starting Motorcar wont turn over Engine wont plow over Starter wont plough engine over Applicable Models	A Class B-Class C-Course E Class Due south-CLASS CLA-Course CLS-Form CLK-Course CL-Grade SLK SL R-Course GLA-Form G-CLASS GL-CLASS G-CLASS

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Source: https://www.mercedesmedic.com/mercedes-wont-start/