Failed inspection because check engine light won't light up?

Rangerdanger2000 · Apr 21, 2017

Hello fellow members! My name is Frank and I currently own a 2000 Ford Ranger 3.0 v6 extended cab step side. I bought the truck last week and when I took it for inspection it failed for not having a working check engine light. While driving the truck I also noticed that the door ajar light is always lit even though all the doors are closed all the way. It seems as if there is a malfunction within the dash warning lights. I was told that this could be caused by a bad bulb but highly doubt that since other warning lights aren't working either. Any advice out there on how I can fix this? Thanks in Advance!

Spott · Apr 21, 2017

Rangerdanger2000 said:
other warning lights aren't working either.

Please clarify. You mention that plural "lights aren't working", but only specify the door ajar light.

In general, it is extremely likely that Check Engine bulb is just burned out, and that the Door Ajar light has a bad door switch or something. Why are you looking for a more complicated reason?

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RonD · Apr 21, 2017

Welcome to TRS

Google: ford ranger door ajar light stays on

It is a common issue and often can be fixed by spraying WD40 or similar into the effected door's latch mechanism

Yes, it could be a wiring problem, but...............some sellers do disable lights on purpose so things "look fine" when they are not, so just a grain of salt.

CEL(check engine light) should come on when you turn on the key, shows that computer is booting up, then it will go off after engine starts up, assuming there are no codes set in computers memory, if there are it will come back on.
Most buyers would shy away from a vehicle with CEL on all the time, so...........bulb is pulled out or blacked out with tape.

Most warning lights in the cluster, including the CEL, get 12volts when key is turned on, the way they are activated(light up) is by GROUNDING the bulb.
You will need to pull out the cluster and check voltages and GROUNDS so have a volt/ohm meter to do this testing.
Also test the bulbs and have some extras handy
You may want to change all the cluster back light bulbs as well, 6 of them, not expensive and hard to get to, so just do it now, they are 17 years old.

I posted wiring diagram for 2000 Ranger instrument cluster in this thread that you can download and print: http://www.therangerstation.com/forums/showthread.php?t=167158

CEL is called MIL by FORD in the diagram, MIL = multi-function indicator lamp, because it also will come on if there is a transmission problem(automatic), or emissions problem so not just "engine" issues

Failed inspection because check engine light won't light up?

Rangerdanger2000

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