Check engine light - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-23-2009, 05:24 PM Thread Starter
BenzWorld Junior Member
Date registered: Jul 2008
Vehicle: 1991 190E
Location: South Jersey
Posts: 22
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Check engine light

Is there a way to find a code for the check engine light instead of taking it to a shop? If so what do you need to check it.
190E Dee is offline  
Sponsored Links
post #2 of 3 (permalink) Old 05-23-2009, 06:55 PM
BenzWorld Elite
slk230red's Avatar
Date registered: Mar 2004
Vehicle: '01 SLK230,'93 190E 2.3, 1971 LS5 Corvette Convertible
Location: Tampa, FL
Posts: 2,022
Mentioned: 0 Post(s)
Quoted: 33 Post(s)
Originally Posted by 190E Dee View Post
Is there a way to find a code for the check engine light instead of taking it to a shop? If so what do you need to check it.
My '93 doesn't have a check engine light, but the CFI Control Module still stores DTC codes and I can retrieve them using one of the homemade LED testers that has been discussed on this site.
Since yours has the check engine light then it probably has the built-in LED mounted in front of the battery. Press button for 2 to 4 seconds, note readout.

1 flash = No malfunction in system
2= Throttle position switch, wide open throttle contact
3= Engine coolant temperature sensor
4= Air flow sensor potentiometer
5= Heated oxygen sensor
6= not assigned
7= TD signal
8= Barometric pressure sensor
9= Electrohydraulic actuator
10= Throttle position switch, closed throttle position contact
12= Exhaust gas recirculation temperature sensor (California models only)

Info. from manual:

"The CFI control module monitors all the exhaust components of the CFI injection system and the exhaust gas recirculation. Malfunctions caused
by an open circuit or failure of one of these components are indicated by the malfunction indicator lamp in the “CHECK ENGINE” instrument cluster and simultaneously stored in the CFI control module.

A diagnostic connector (X92) with non-locking switch (2) and LED (4) is provided for this purpose on the right of the component compartment partition wall. When the nonlocking switch is pressed (ignition: ON) for
between 2 and 4 seconds, the flashing DTC output is initiated and the fault path indicated by the number of flashes.
After completion of the flashing DTC output, the LED shows a steady light. If the non-locking switch is again pressed for between 2 and 4
seconds, a further fault path can be indicated if it exists. If no further fault code is detected, the CFI control module switches over to on/off ratio
Erasing flashing DTCs. Once a fault has been rectified without having
disconnected the CFI control module, the flashing DTC output displayed must be erased as follows:

When the flashing DTC output is displayed, wait 2 seconds before pressing the nonlocking switch for 6 - 8 seconds.
Each flashing DTC output displayed must be erased individually.

The non-locking switch and LED have been developed to enable customers and non-MB dealers to specifically pinpoint the fault path with “on board means” in conformity with legal requirements. An impulse counter scan tool
which indicates the stored fault(s) on a digital display has been developed for MB workshop personnel (see DTC output to diagnostic connector)."

slk230red is offline  
post #3 of 3 (permalink) Old 05-24-2009, 12:33 PM
BenzWorld Elite
Date registered: Dec 2008
Vehicle: 1993 190E 2.6, 1990 300SEL, 1992 300SE, 1992 400E, 1987 190E 2.6 murdered by my brother.
Location: San Franciscisco, CA & Las Vegas, NV
Posts: 1,291
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
My 1993 190E 2.6 has a button with LED right by the battery. Lift cover and hold down the button for a 5 seconds and let go. After if flashes keep track of how many times it does. Hold button down again after it is done flashing for 5 secs and then it will reset the Check Engine Light. Have to do this with the engine running or it will not work.
Runninrebel211 is offline  
Sponsored Links

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W201 190-Class

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Topic Author Forum Replies Last Post
2002 c 230 check engine light and srs light upstaterider2003 General Mercedes-Benz 4 08-04-2008 07:35 AM
1997 S420 Fuel gage light flasehs setting Check Engine light aljabari W140 S-Class 7 09-03-2007 09:19 PM
How to check code for check engine light 94 E320 W124 Synd W124 E,CE,D,TD Class 1 05-24-2007 02:37 PM
would blown dashboard light make check engine light go on? ae98 R170 SLK-Class 3 10-07-2006 12:36 AM
check engine light & flashing fuel guage light pd99sl500 R129 SL-Class 7 02-27-2005 04:31 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome