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  #1  
Old December 6th, 2005, 12:09 PM
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Jameson
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Orange Check Engine Lamp

1994 Defender 90, 64000 miles
Note: I don't think the O2 sensors were ever replaced.

I was driving the Defender on the highway today and the Orange Check Engine Lamp came on while I was going 75 mph. I don't see any change in performance.

What could cause this lamp to come on?
How can I reset the lamp?
Will it reset on its own if the problem is fixed?
If I disconnect the battery, will this reset it?
Does the 1994 have the ability to plug the decoder in to read the fault?
Where is this located?

Thanks for all the help. I am stressed since it is the Holiday Season!!!
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  #2  
Old December 6th, 2005, 12:17 PM
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Phillip
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I think those are programmed to come on at 60k miles if my memory serves me correctly. i think if you disconnect the battery for a bit it will reset everything. IF it seems to be running good I wouldnt worry. I am sure someone knows more than I and will provide input
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  #3  
Old December 6th, 2005, 12:20 PM
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Great. I will try that right now.
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  #4  
Old December 6th, 2005, 01:08 PM
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Just to make sure, there are 2 possible lights.

One says "Service Engine" and runs off a timer, coming on at certain intevals. This one basically says "your truck has gone a while, why not check the emissions system to make sure it's all working?". This light IIRC is red.

The other, "Check Engine", comes on if the computer is noting a fault code. When this happens it does two things.

1. It goes into a pre-set mode that ignores input from certain sensors.
2. The display lights up with an engine code.

On a '94 the display is on the passenger side firewall. If you have Air Conditioning it can be a bit hard to get to. If not, it's right there. Just lift up the cardboard that your passengers keep kicking, it will be a dark brown box the size of a cigarette pack that says "Land Rover Diagnostic Display". You can actually see the codes through the plastic if it's not too bright out, otherwise you have to pop the cover off. On mine, they are shown on the side that faces the firewall, so I have to slide the box off it's mount and turn it over.

Grab the codes, and post them up for us.

-Hans
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  #5  
Old December 6th, 2005, 01:21 PM
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Thanks for the follow up.


Prior to your post, I disconnected the battery for a minute or two. After reconnecting and starting the Defender, the Orange Check Engine Light was no longer illuminated. I let the engine run for several minutes to confirm that it did not come back on. By disconnecting the battery would this reset the LED Diagnostics? I have AC with my defender located in the center of the dash. Do I need to remove this to investigate the potential fault code? If it is located near the passengers feet, is it something that I can't miss? Let me know. I really appreciate the help.
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  #6  
Old December 6th, 2005, 01:48 PM
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A lot of times, just resestting the computer like that does take care of the problem. If the light is out, I wouldn't worry about it.

Should it come on again, then you'll have to dig in to get to the diagnostic box. A lot of the AC components are mounted on the firewall in front of the passenger, and the diagnostic box I believe is behind that. Never had a chance to look at a 94 with AC, so I can't say for sure. Maybe somebody else that has one can chime in?

-Hans
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  #7  
Old December 6th, 2005, 02:26 PM
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Its on the passenger footwell behind a piece of plastic trim that has 2 screws in it. Unscrew and remove said piece and the computer and display will be right there.
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  #8  
Old December 6th, 2005, 05:25 PM
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Check engine

Mine comes on whenever the temps dip under 30 or the humidity changes drastically. Goes out after a day or two. Might be just that.
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  #9  
Old December 6th, 2005, 10:24 PM
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Thanks for all the help. I was able to drive home today from work without the Check Engine lamp coming back on. I will keep you posted. Thanks again.
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  #10  
Old March 12th, 2006, 07:51 AM
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mine came on last night the red one came on I am guessing it is the emissions inspection light?
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