View Full Version : Check Engine Light

08-30-2007, 05:55 PM
Looking for a little help...

1989 325is

When the engine is warm, while idling at a light or in traffic, the check engine light comes one.

I am a little stunned as to what it could be because I just did my etest with it last week and it passed with flying colours.

Any info would be greatly appreciated.



08-31-2007, 12:26 PM
I guess i should have mentioned that once you press the gas, the check engine light goes out until next time you are at idle. hope that helps.

08-31-2007, 12:47 PM
O2 sensor maybe?

08-31-2007, 03:22 PM
when the light comes on, shut the car off and do the gas pedal trick to get the code.

Its most likely a o2 sensor or afm issue.

08-31-2007, 04:35 PM
you are going to have to explain the gas pedal trick to me... i have never heard of it before.

I think it is the O2 sensor also, but it passed emmisions with flying colours. I dont get it.

08-31-2007, 08:07 PM
gas trick? Fill me in too, because I have had this problem as well before but then it went away about 2 months ago. I have never heard of the gas trick.

08-31-2007, 10:00 PM
There is something called Google, learn how to use it.

Late 1980's systems. Motronic 1.3

The fault codes for these systems will appear on the check engine light when you turn the ignition key to the On position (but dont start it), then: fully depress the accelerator pedal, then fully release it. Repeat the depress,release cycle 5 times fairly quickly, but not too fast. It should be completed in a few seconds. What you are doing here is clicking the wide open throttle switch then the idle switch each 5 times. This signals the Motronic unit to send the fault codes by flashing the Check Engine light. You should see the light flash once then it will start flashing the 4 digit codes. If there are no faults, you should see the 1444 code (and 2444 if you have a 12 cylinder). The codes appear as a series of flashes for each digit. The flashes indicating one digit are about 1 second apart, the next digit appears after a couple second interval. The rest of the fault codes appear in Table 1 below.


08-31-2007, 10:35 PM
damn I never knew that, thanks for the update. I have to go check that out.

09-03-2007, 12:41 AM
hey thanks for the tip, but i tried it and I dont know if i am doing something wrong, but it didnt work for me. this is what i did...

turn key
depress gas pedal
release gas pedal
turn key back
repeat 5 times

Nothing happend.

09-03-2007, 01:57 AM
what the hell is a check engine light.. haha but seriously, I have never seen mine on my Eta..

09-03-2007, 02:07 AM
keep trying, it may take you alot of tries before you get it right.

El Gato Liso
09-03-2007, 02:14 AM
i have this exact same problem too! time to try this trick outtttt