i have a 94 e 420 i check the codes yesterday an it came back with 4, 6, 19, 20 could some one give me some advice to what each code is n how to fix oh i did clear them but havent had a chance to recheck

also i forot to mention the abs light is on also

You may have an issue with your OVP relay (the ABS light has come on in my 560SEL when my OVP went out).

Here is a fault code list that I got from somewhere about a year ago, and I'm pretty sure this would apply to the e420 you have, but #19 and #20 would make me question that (I know it's for a w124 e320 anyway...)

Display Diagnostic Code
1. turn-engine off;
2. turn ignition switch to #2 position (do not start car);
3. depress switch (at diagnostic port) for 1-second, then release;
4. count number of LED blinks before going to solid/always on;
5. depress switch again to see if there are any other faults in memory (faults are displayed in descending order, and if there are no other faults in memory, the first fault number should re-appear);
6. record the number of blinks you counted for history;

Erasing/Resetting Check Engine Light
within 20-seconds of LED going to solid/always on,

1. depress switch for 6-10 seconds, release;
2. LED should blink ONCE then go to solid/always on;
3. turn ignition switch off;
4. restart car and verify that Check Engine Light is OFF (assuming you have CORRECTED the problem).

Here are the error codes.
Count the blinks after pressing the diagnostic button for 1 sec.

1. No Malfunctions;
2. Full load contact, throttle valve switch implausible;
3. Coolant temp. read by CIS-E implausible;
4. Potentiometer voltage implausible;
5. O2-sensor signal implausible;
6. Not Used;
7. TNA-signal (RPM-signal) read by CIS-E implausible;
8. Altitude pressure signal from EZL control unit implausible;
9. Current to EHA is implausible;
10. Idle contact, throttle valve switch implausible;
11. Air Injection System;
12. Absolute pressure values from EZL is implausible;
13. Intake air temp. reading is implausible;
14. Speed signal read by CIS-E is implausible;
15. Not Used;
16. EGR
17. O2-sensor line shorted positive to ground;
18. Current to idle speed air valve is implausible;
19. Not Used;
20. Not Used;
21. Not Used;
22. O2-sensor heating current implausible;
23. Short circuit to positive in purge switchover valve circuit;
24. Not Used;
25. Short circuit to positive in start valve circuit;
26. Short circuit to positive in shift point delay circuit;
27. Data exchange between CIS-E unit & EZL unit interrupted;
28. Intermittant contact in coolant temp. sensor circuit;
29. Difference in coolant temp. read between CIS-E unit & EZL unit;
30. Not Used;
31. Intermittant contact in intake air temp. sensor;
32. Not Used;
33. Not Used;
34. Coolant temp. from EZL unit is implausible.

thanks elrojo but that is what the blinking light is giving me 4, 6, 19, 20, i see u have nothing for 6, 19, 20, what is a potentiometer for #4. i thought there was no ovp on a 94 e420 if so where is it . also with the abs light would that have to do with the brake light switch i thought i read that some where on this forum some while back

Nucor, what problems/symptoms are you experiencing with your car?

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

cal
when i try to start car it will not start unless i push the gas pedal then it would act as if its missing then it would settle out n i would smell raw gas i check codes n i come up with 4,6,19,20. plus where is the ovp located on my car its a 94 e420

Car does not have an OVP.
Check the fuses at the Base Module.

Are you getting the codes from the DM ?


Pull the vac hose off the FP reg at idle and see if fuel comes out the vac port.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1994-Mercedes--Benz-E4--0-Fuel--Injection&yearid=1994%40%401994&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6396%3AMBC%7C1530%3AED%7C10000072%40%40E420&catid=240621%40%40Fuel+Injection&subcatid=240645@@Fuel+Pressure+Regulator&mode=PA

__________________
A Dalton

<< and I'm pretty sure this would apply to the e420 you have,>


It doesn't

__________________
A Dalton

Well, I tried... Sorry it wasn't helpful. Mr. Dalton-- any idea what that code list DOES apply to? I'm now guessing it's for an earlier version of the 124???

thanks arthur i got the codes from the box with the blinking light. i erased the codes but code 19 came back could you tell me what that code is. i will try the fp reg tommorow. also what fuse should i check in the base module. also thanks elrojo

>>

Rojo.

That would be an ealier 124 CIS system car.

Here is a site that has all codes..so you can be Model/Year specific.

http://www.geocities.com/MotorCity/Downs/1039/mercedes/cs1000_mb.pdf

__________________
A Dalton

[QUOTE=nucor;2246359]thanks arthur i got the codes from the box with the blinking light. i erased the codes but code 19 came back could you tell me what that code is. i will try the fp reg tommorow.

also what fuse should i check in the base module.

All 4.


Code 19 can be a troublesome code on that chassis. It is a fuel adaptation code and they did not allow enough % of limit. So, they can be modified.

But, before I get into that, check the FP regulator. That , and vac leaks, are common causes of an adaptation limit code. Check those first.

You can re-set the memory adaptation back to mean , but you will have to build the led tool for that.
Are you familiar with the tool???

__________________
A Dalton

yes i built a code reader but if i have to reset the codes in the 38 pin iam going to have to get smaller ends to put in the holes . i have not used it but i have read some of the post on how to use. as for the fuses would that be #4 fuses plus check all of them. thanks A D YOU ARE THE MAN