View Full Version : Inspection light (how accurate )

02-17-2009, 02:15 AM
If you look on your E30 cluster, there is GREEN-YELLOW-RED strip inspection light close to the E brake bulb. When I got my car, it would stay on yellow or green most of the time. Now It stays on red, and when I drive it the next day it goes back to yellow or green.
My question is , how accurate is that inspection light considering the age of our cars? Should I look things over evethough I am not getting "check engine" warning.
There is also the oil inspection light. That one stays on green since I put good oil in her. What is your bet?

02-17-2009, 02:22 AM

02-17-2009, 03:39 AM
you have to have it reset with a tool under the dash when you change the oil. Just change your oil every 5000 km or 3 months, don't go by the light, but have it reset.

This is the only light I don't trust on my Dash, No car can tell you what shape your oil is in, its just a mathimatical timer of some sort, even in the newer cars, oil change lights are shit.

02-17-2009, 03:50 AM
on my E34, I'd change the oil when I have 1 green light left.

02-17-2009, 05:33 AM
2000km since I did the oil. I agree, I don't follow the cluster lights. As soon as I am close to 5K, I change it.
How about on the right side of that strip set of lights. It is the inspection that I am more interested to find out. How accurate is inspection light?

How would I reset it?

02-17-2009, 09:36 AM
Most oil change shops should have the reset tool, stop by one and toss somone 10 bucks and ask them to reset your light, or buy the tool for yourself, think you can get one for about $100

02-17-2009, 10:48 AM
resetting the light on an m20 is really easy. theres a procedure out there for doing it. try to google something.
its just sticking a jumper between 2 pins on the testing socket in the engine bay, you turn the car on with the jumper in, wait 5 secs or somehting, then shut car off and remove jumper.
Its along those lines. It shouldnt be going from red one day to yellow or green the next though. You might need a new service ind board someday if it really bothers you.

02-17-2009, 11:26 AM

It's a complete waste. It can be done with a test light or a piece of wire.

What you need to do is ground Pin#7 in the dianostic plug under the hood. Either take a test light or speaker wire and stick it in there, turn the key to ON - Don't start, wait 3 seconds, and the lights should reset. Wait longer i think 5-7 seconds to reset the Inspection light.

I believe pin#14 is gound(not sure thou) so bridging it to the ground PIN would work also.

But i found using a test light is easier, since it is pointed and sticks right into the PIN and i just ground it to the shock tower.

02-17-2009, 04:19 PM
I dont really pay attention to my inspection light. Mine goes on and off. Lol.

02-17-2009, 08:36 PM
Just wanted to get some peace of mind. Took it for a car wash and she is back in yellow. Does not bother me too much.
Thanks a lot.

02-17-2009, 09:23 PM

02-17-2009, 09:31 PM