Check engine reset
Thread Starter
Newbie
Joined: Jul 2017
Posts: 8
Likes: 0
clk w208
Check engine reset
Hello, is there any way to reset check engine indicator without diagnostics tools ? Check engine went on because of missfiring i fixed that problem, but check engine is still on.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
Have to agree with cindyclk.
When it's a OLB II emissions issue, after a successful repair and 3 cold starts, the CEL will turn off.
However, that occurring , if you're due for a state emissions test, there are additional sensors that need to change to 'ready' in order to pass. After a successful repair, it will take a couple of hundred miles of additional driving to reset the sensors (even though your CEL is off).
If your CEL hasn't turned off after at least 3 cold restarts. that indicates that the necessary repair is still pending.
Alternatively, you can clear the trouble code, with most OBDII scanners and see if the CEL reoccurs.
Hint: Miss-fires are not always due to just spark plug condition.
When it's a OLB II emissions issue, after a successful repair and 3 cold starts, the CEL will turn off.
However, that occurring , if you're due for a state emissions test, there are additional sensors that need to change to 'ready' in order to pass. After a successful repair, it will take a couple of hundred miles of additional driving to reset the sensors (even though your CEL is off).
If your CEL hasn't turned off after at least 3 cold restarts. that indicates that the necessary repair is still pending.
Alternatively, you can clear the trouble code, with most OBDII scanners and see if the CEL reoccurs.
Hint: Miss-fires are not always due to just spark plug condition.
Last edited by Serndipity; Jul 9, 2017 at 07:21 PM.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 1,232
Likes: 168
From: Glasgow, Scotland, UK
SL 350 R230 (3.7L with AMG Speedshift autobox)
Miss firing in my experience is usually not the plugs but an ignition coil.
What car have you got ? If its a 200 or 230 then you will have two ignition coils one per pair of plugs.
What car have you got ? If its a 200 or 230 then you will have two ignition coils one per pair of plugs.
Thread Starter
Newbie
Joined: Jul 2017
Posts: 8
Likes: 0
clk w208
I already fixed that missfiring 
like i said it was spark plugs for me. But check engine dont go off and i dont have diagnostic tools to reset it :/ tried to off battery and press and hold brake for about 2 min, nothing happend just radio reset 
like i said it was spark plugs for me. But check engine dont go off and i dont have diagnostic tools to reset it :/ tried to off battery and press and hold brake for about 2 min, nothing happend just radio reset
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