Help with interpreting codes #19, E420
 

My car just light up the check engine light and I checked the code was code 19, i don't know what it mean. the car is running normally, but i want to know what is wrong. please tell me what this code 19 mean and to fix it.

Your help is so much appreciated.

Let's just say . . .
 

that DTC#19 is not 'nice'! The LH-SFI module (Menu#7) has reached the end of its 'self-adaptation' range, so the CEL come on. Of course, it could be a cracked or broken vacuum line and / or a malfunctioning injector but normally if you haven't been working on your car, it's due to "aging".

I can fix the problem with a new eprom for the LH-SFI module.

Because you got a code #19, I'm assuming you have a '94 or '95 E420, but it is just a guess.....

Help with interpreting codes #19, E420
 

Thank you JimF and Suginami for your help. Yes my car is 1994 E420. It is running fine, but why this lighted up? I have reseted the computer and so far the light hasn’t come back yet. Should I have to worry about it?

Thanks

No . . .
 

. . don't worry! Even if the CEL comes back on, it can be fixed. I sent you email re the problem.

Thanks again JimF. Nothing related to wiring harness right? I took care of my car real good. This car never fails once. I love it so much.

:)

If you haven't changed your
 

wiring harness (w/h), count your blessings! Since they all degrade, you are living on borrowed time.

But the DTC#19 does not normally involve the w/h. If the #19 problem is "real", the CEL will come back.

You can 'test' to see what's going on: If you have access to a "pro" scanner, then the self-adaption (s/a) can be read using the live-data feature in the scanner. The current state of the s/a can be read it and that will tell you whether the CEL was 'real' or not.

The present limits are +/-15% from nominal (which is "1"). So if you have it read, then let me know. If it's close to 0.85 (the lower limit), then the DTC#19 is "real"!

E420 CODE19 solved by JimF chip
 

One more happy customer:), CODE 19 fixed by JimF's chip
Simple CHIP replacement and the CODE 19 is gone!
THANK YOU JIM!!!
I've attached few pictures and hopefully it could help some peoples.

Glad that it fixed the problem . . . the track record continues to climb.

Now, thanks are in order to you for those great pictures. I've been meaning to add a page and your pics may be just the ticket I need. May I use them??

Jim, sure feel free to use those pictures. I'll e-mail more to you with the original size that you could pick and edit the prefered one.
We're here to help peoples!:)