1994 Mercedes E320 Check Engine Light Diagnostics

Diagnose the Check Engine Light on your 1994 (and other model years) Mercedes E320, with the M104 Engine and W124 chassis. Clear/Reset Check Engine Light.

[@majorsnodgrassthethird5699]

I have one of these wonderful cars. Quick tip run on super unleaded the extra cost is worth it as they run even better.

[@DIY-Wizzard]

Thanks so much for your how to videos, I also have a 94 e320 that Im restoring. Its my first MB and I love this car. a dream to work on after my bmw 2002 and porsche 914

[@ahmedmousa4342]

hello guys i'm Egyptian Mechanic regarding to delay in shifting transmission to fix this issue you have to replace or to clean the air filter or to clean it well if this problem not solved you have to clean the air sensor and throttle with cleaner cause much amount of air flow required to pass to throttle when shifting from 2nd to 3rd or from 3rd to 4th for high speed welcome to all from Egypt

[@chrisgooi]

Thank you! Air filter..

[@michaelschneider-]

@eallevato .. Many thanks. Our MY94 E320 coupe thanks you.

[@Gripen85]

eallevato, thanks a lot I love your videos on this car. It helped me actually start with DIY :) Keep on doing them for the M104 W124 !!

[@MrJforbus]

You rock!!! Just did it myself.

[@mikejohn0088]

My LED does not light when I press the button--- do I need to reset the module by disconnecting the battery for a hour or so?

[@STRAIGHTP]

very helpful thank you

[@Shedlight420]

Thank you for sharing!

[@vijaywaingankar8352]

Good job

[@eallevato]

It is the brake pad warning light. It is telling you that you that the brake pads are worn down. Time for new pads. Good luck.

[@bzelinski5]

Thank you for the info big help

[@shadow5870]

Hello, I went searching for the diagnostic support my car have. I found it but it got no button to push to start the diagnostic test. Is there a way to do it without a button ?. I believe that my car model is marcedes benz e320 1993.

[@christophdr.fischer8484]

can you send me a link to the "dtc code listening"?

[@mansouralabbas9499]

Hi I hope you're still reading the comments from an 8 year old video. I have a 94 s coupe and I have replaced the steering wheel with another one after replacing it the SRS light turned on. Do you think a restart would fix it?

[@Nikkymomo]

Hey thank you so much.

[@ruslanmadjid5337]

Thank you 👍👍👍👍

[@okam1000]

I LIKE THIS CAR ..I have one Mercedes-benz E300 1991 black engine .

[@martayotrujillo9772]

Is there a link for the PDF codes?

[@Steven-cg2tt]

Thank you very much one more question now that I know is the idle speed control do you know exactly the part I need to change.?

[@manveersidhu7468]

What do you do if you have multiple codes how do you check that

[@olivercruz505]

The greatest

[@SnakePlisskin1985]

What if my light is on but I can’t get it to flash?

[@eallevato]

Sorry for the delay, just Google "Mercedes DTC" and you will get all kinds of hits.

[@arnisargenisvelazcocastill4690]

BUENAS TARDES MUCHAS GRACIAS POR SUS VIDEOS DONDE PUEDO CONSEGUIR ESE MANUAL DE FALLAS CON LOS CODIGOS

[@eallevato]

So, was it the brake pads? Regarding your other issue, it could be any number of things, have you had your engine wiring harness replaced? See my other video on how to change the harness.

[@bbqpls2569]

my check engine lights goes on and off what could it be?

[@robertbehrendt7763]

Hello, need your expertise. Engine doesn't start -> DTC flashes 17x. Where is the mistake !? greeting

[@eallevato]

17 flashes means: Data exchange malfunction between individual control module. Check to see if all the connectors are firmly attached to the Engine Control Module. Do you have the infamous biodegradable engine harness?

[@robertbehrendt7763]

@@eallevato Hey eallevato, I found the reason! Thanks!!! Can you send me a complete error list?

[@Antoni2u]

I have a 1994 e320 sedan and this warning light the looks like a small circle [ left side of the cluster] with little dots around it, sometime flashes on and off, then it disappears and starts flashing again but slowly...what is that?

[@richardpvancouver7520]

Won't the light just come back on if you don't fix the issue??

[@iuriidascalescu4797]

I have a problem after replacing the box machine is not running 5-th transmission kick-down, and what do I do?

[@eallevato]

Seven blinks means "Igniton System Faulty". More than likely it is the main engine harness. Do you know if it has been replaced?

[@przemekiskra6471]

what about code 5? is it save to drive with it?

[@alexlevinta387]

I have a problem myself. Have a delay when switches from 3rd to 4th gear. Before it switches to 4th feels like it's in neutral (rpm's goes high fast and then pops in 4th). You got the same problem? And btw I have 1988 260e

[@MARTRELL17]

Alex Levinta mine does the same did u figure out the issue? and my code light just stays red then when I press it it only gets brighter..I need an answer right away because people are telling me the tranny is bad 95e420 automatic..

[@captainbulus5400]

But my benx M104 doesnt have that push botton for diagnostic

[@eallevato]

A scanner is not necessary. When there are multiple DTCs, the LED will blink one sequence after another,until a single LED blink, indicating that is the last one.

[@yogavnture1]

do u think this car will be desirable as a restorable car in some years time? I have one that just sits. with 70000 miles on it

[@OldBenz4ever]

Please help! I push the button for 4 Seconds ,but the bulb stays off . 😞

[@mikejohn0088]

Me too--- I think the module has to be reset so I'm going to disconnect the negative battery post for a hour and then try again.

[@rencitin]

HI, MINE IS NOT FLASHING GREEN AFTER PRESSING FOR 4 SECONDS. THANKS

[@MrKunguru]

WHAT DOES BAS light indicator mean?

[@eviechau4973]

What do you do when there are multiple codes

[@createbad]

so is a scanner actually necessary since one is pretty much built in

[@napoleonbalvarez1361]

can you tell me about a 1990 300e?

[@iurkadaskalesku7263]

Thank you very much

[@mustafabenz6736]

hello, i have mercedes 300e and i buy a new engine (E320L M104) i have a wiring diagram for the ECU but i can't find the throttle body wiring diagram ,,,, can any 1 help me

[@eallevato]

+Olds Oldsmobile Google "w124-zone". When you go to the website, you will find a ton of information.

[@mustafabenz6736]

eallevato tnx for helping

[@Oghurrakane]

What the 17 code mean ?

[@randolphcirilo4800]

Dont suppose the 92 w140's have that anywhere??

[@bobl78]

unique to US and maybe Japan models...in Europe they did not have check engine lights

[@VanessaKlinger]

I performed this test on my 95 e320 and the light didn't flash at all.. What does that mean? Oh the check engine light is still on..

[@okam1000]

يازين سياراتكم

[@saeedf4517]

ههههه ايه والله

[@okam1000]

@@saeedf4517 يا الله تعليقي هذا من 8 سنوات !! يالله عمر وعافية

[@saeedf4517]

آمين اجمعين باذن الله

[@lexusry]

HOW DO YOU READ CODE ON 91 MERCEDES 300CE AND CLEAR CODE

[@DanyAlva31]

Keep on blinking 5 times Help me please

[@michaelburney8833]

could someone show me how to replace the secondary air pump on a 97 e420 mercedes

[@dianegallina6904]

thank you very much for this video. I had a bad radiator leak so replaced that and the thermostat. After test driving for few miles the check engine light came on. The car is driving perfectly fine but there as mas amounts of coolant spraying everywhere before it was fixed. When i ran diagnostic it blinked 7 times when seems to be ignition failure. Do you have any input as to what it could be ? and How fatal ? Thanks in advance !

[@eallevato]

+Diane Gallina Do you still have the original wiring harness? If yes, then maybe when you had the coolant spraying everywhere, it temporarily shorted something out. I would clear the Check Engine Light and see if it stays off. If you have not seen my other video on how to replace the biodegradable engine harness, check it out. Good luck.

[@dianegallina6904]

+eallevato actually i just tried to reset like you mentioned and now its not blinking 7 times its blinking 12 times. Very Odd !! I looked it up and it says 12 blinks is heat oxygen sensor heater/open / short circuit any input ?

[@eallevato]

+Diane Gallina Hi, you did not answer my question about the engine harness. If you have the original engine harness, it could be degrading badly and you will see all kinds of bogus faults. You may have multiple faults that need to be cleared.

[@dianegallina6904]

+eallevato Sorry yes it is the original harness to my knowledge. If a issue with the harness how long till it causes major issues ? or is it ok to drive on it. I tested it a few times with time between and am only getting the 12 blinks. again drives fine minus some shaking at high mph but i think its due to bad brakes

[@porceder]

Thanks helpful, but should mention there may be multiple Codes & should continue reading.

[@eallevato]

I am sorry, but I am not an automatic transmission mechanic/expert. I would research the topic on a couple of good Mercedes Benz forums on the Internet or perhaps talk to a transmission specialist at a garage.

[@TheLavozdedios]

Where did you find on the internet the DTC codes for free download???? Thank you for your info its been great

[@eallevato]

+Michael Fitzhugh Google "E320 16 pin DTC".

[@VanessaKlinger]

It blinked 7 times what does that mean?

[@ze_german2921]

that was cool. My 94 E320TE cranks but no start. I bridged the Fuel pump relay and tricked the fuel pump to come on but still no start, so then I sprayed carb cleaner into the intake and still no start, which tells me I have no spark as well. You recon I have some sort of Imobilizer interfering? No fuel no spark? everything was running fine and after 4 month of sitting the batterie died and would not start anymore. It is a North American model non Calif.

[@ze_german2921]

UPDATE: I had fault Code #17 which indicated bad OVP Relay so I drove to a pick-n-pull Junkyard and scored multiple Relay's. I Swapped the Fuel pump Relay as well as the OVP Relay and I am back in Business, running like it always has.

[@Antoni2u]

Thank you, I got it fixed. I have ANOTHER issue...sometimes when I accelerate the engine hesitates and it makes a sputtering-putt putt sound preventing me to speed up... any ideas my friend???

[@19tuureluur86]

Air sensor? It hesitates above 3800rpm? I hope you still have the W124.

[@eviechau4973]

are able to reset it

[@babyj154]

@eallevato dude I love your videos keep posting! I have the same e320 like you sir! Yep! Pearly white! I've already had the wire harness replace a while back and I wish I would of discovered your video sooner hahaha! I have this electrical issue. My radio will not cut on and my power locks are not working automatically any more. Also my seatbelt light keeps flashing. I believe something is draining my battery (perhaps the altenator) can you put up a video on how to replace the altenator please thanks

[@karakartal1123]

The check lights come back again or pernamently!

[@eallevato]

It should have worked. If you look at my video, it also did not work on the first try. I had to press it and hold it for a second time.

[@Steven-cg2tt]

1994 e420 read code 6 any help?

[@eallevato]

+steven davila Six flashes means that the Idle Speed Control is faulty.

[@leomarchan2532]

steven davila I have same car and same code, did you resolved the problem with code 6?

[@edwinordaz5294]

Code 25???

[@pargevpogosyan8781]

netu Armiaski ili ruski yaziki ?

[@ashot164]

Pargev Pogosyan насколько я его понял, 26 миганий значат что у него задержка (delay) при переключении с 2 на 3ю скорость. у меня тоже самое на машине, но как он это лечить хочет, я не понял

[@pavisingh7049]

good me like

[@johnsmith-uh1gs]

Clearing a code by itself does not solve the problem. If you do not repair the function that set the code, it will come back.

[@eallevato]

Yes, I know that. That is why at 02:50, I said "I choose not to do anything about it" about this particular DTC code. The intention of the video was to show how to use the built in diagnostics port and how to clear the Check Engine Light.

[@thelittleleprechaun]

Here we have another smart ass telling the teacher how he should do the job but never having the intellegence to make his own video Eall, was simply showing how to troubleshoot a problem on the car. As i have a Merc i found this extremely interesting and intuitive for future use Instead of critisizing try making your own video

[@serjiohernannes585]

Qué sí ni fica 26 par paneos ne un mersenesben 1993 400e

[@okam1000]

here in Sudia Arabia no technician good...