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  #1  
Old April 6th, 2009, 12:08 PM
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RED Check Engine Light

Hi,

My check engine light came on today. I searched this site and found many answers from "if the truck is running don't worry about it, to disconnect the battery, to study the fault codes, etc."

My truck is running great. It came on today for no reason when I was idling in light rain. Questions:

1) Any problem to keep driving the truck - the manual does not say so. How long can I go?

2) Anyone in the Columbia Maryland area have a fault reader and want to show me how to do it, so I can get the magic fault code. Seems like I can not know too much without this fault code.

3) Will disconnecting the battery reset it, and let me see if it comes on again over time?

4) Any chance this "check engine" light will just go out, if there is no real problem?

Thanks,

Flagg
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  #2  
Old April 6th, 2009, 12:28 PM
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Chris Snyder
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Have you checked to see what the code is? It might just be a non issue or it may be useful.

The "proper" way to reset codes is to disconnect the ECU, turn the ignition on until you hear the ECU relay drop out, shut the ignition off and reconnect the ECU. Resetting the code that way just erases the displayed code and leaves any others that may be in the ECU (while will display with ignition turned back on).

However just disconnecting the battery will do it as well you will just loose ALL codes (should there be multiple).
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  #3  
Old April 6th, 2009, 12:29 PM
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Scott T
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Hey Flagg,

The '95 defenders were OBDI compliant vehicles, so there is no place to plug a scanner into, and the ECU wouldn't know how to communicate with it anyway.

If you look under your passenger seat (in the compartment) there should be a black box displaying an Error code in LED lights (with the ignition on). You can take that code and cross reference it with this list.
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  #4  
Old April 6th, 2009, 12:38 PM
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Chris Snyder
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Whoops sorry I didn't read you weren't sure how to check it. Here's what the box looks like:
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  #5  
Old April 6th, 2009, 01:25 PM
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Scott and Chris,

You guys are awesome in your quick responses. I am an original owner of my Defender, and have been in that passenger compartment - but never noticed that box (I am sure it is there - I was just never looking).

I am swamped with work right now - but will try to get that LED code in the next couple days, and cross reference it with the list.........I will be back to you and let you know what I find. Thanks!

Flagg
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  #6  
Old April 6th, 2009, 07:30 PM
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What light came on? The RED "Service Engine" light or the AMBER "check engine"?

The amber one is the EFI fault lamp (as folks described above), the red one is the stupid emission service reminder light that comes on every so often based on miles.
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  #7  
Old April 6th, 2009, 09:34 PM
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Mike,

Thanks for clarifying........

Definitely the AMBER Check Engine light. Not the "Service Engine" light. Mine looks red to me - but it is the CHECK ENGINE light that the manual describes as AMBER (under the Diff Lock warning light).

I will try to look under the passenger seat tomorrow, pretend that I am a mechanic, and get the fault code Then we will see what we got! When I get that fault code I will post it.........

Flagg
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  #8  
Old April 6th, 2009, 10:43 PM
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http://www.robisonservice.com/servic...ouble.asp#1990

Here is the list of fault codes.

14CUX are not that hard to diag once you get it to actually throw a code.

Ron
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  #9  
Old April 7th, 2009, 09:56 AM
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OK.........My fault code is #44.

"Code 44 - Lambda sensor A - left bank"

So tell me in basic terms what that means, if I can drive the truck, and how soon it needs to be fixed???

Thanks, Flagg
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  #10  
Old April 7th, 2009, 10:10 AM
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Lambda sensor = oxygen sensor.
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  #11  
Old April 7th, 2009, 10:14 AM
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If it were me, I'd clear it and make sure it comes back. This is just to be sure it wasn't just a weird fluke. If it comes back, then begins the diagnosis.

Follow-up Post:

Quote:
Originally Posted by JimC
Lambda sensor = oxygen sensor.
Good point. The code doesn't always means it's an actual problem with the O2 sensor, however. Something else can be causing the weird values.
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  #12  
Old April 7th, 2009, 10:18 AM
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If it were my truck I would spend $200 and replace both if the code comes back if you have more than 60k on the truck.
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  #13  
Old April 7th, 2009, 10:39 AM
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I am having the same issue on my Classic, how has your truck been running? I got a used O2 from Will Tillery for like 20$ I am going to have the cats replaced this week. I hope that this will cure my issues, if it does I will report back. I have been having all kinda of trouble the last couple weeks.
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  #14  
Old April 7th, 2009, 02:53 PM
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The lambda sensor check engine light could pertain to a lean fuel mixture caused by a clogged injector too. I had this code when my fuel pump started going out and would not pump enough fuel to operate above 3000 rpms, so it was running lean.
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  #15  
Old April 7th, 2009, 08:35 PM
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Douglas Wozny
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Cellulararrest,

Which side of the "black" box is the display? I don't have any fault codes to display but I didn't see any "window" where the code would be displayed. If there is a code displayed is it REAL EASY to be seen?
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  #16  
Old April 7th, 2009, 09:09 PM
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Wizard,

The first time I checked mine it was just black...........then I realized you had to have the engine running. The code was pretty easy to see then.

I have to figure out what to do next!

Flagg
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  #17  
Old April 7th, 2009, 09:24 PM
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If they're on you'll see it! It's a bit difficult to get a picture of it lit up. There are two large glowing red numerals almost the height of the box. You won't have to search.
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  #18  
Old April 8th, 2009, 11:04 PM
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Questions with a code #44:

1) If the truck is running great - how soon do I guess this looked at........
2) It is safe to be driving it around
3) Should I try to clear the code and see if it comes back? One of the links up above gave instructions on how to do this.

Flagg
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  #19  
Old April 8th, 2009, 11:06 PM
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Quote:
Originally Posted by Flagg
Questions with a code #44:

1) If the truck is running great - how soon do I guess this looked at........
2) It is safe to be driving it around
3) Should I try to clear the code and see if it comes back? One of the links up above gave instructions on how to do this.

Flagg
1. The sooner the better as you're probably loosing fuel mileage
2. Yes
3. Yes
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  #20  
Old April 9th, 2009, 11:45 AM
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Code 44 is the left O2 sensor.

Go to Rockauto.com and do a "Part Number Search"
You want Standard Motor Products # SG-130
They still have 6 in stock under a closeout price, at $27 each.

You will need to swap the wiring connector from the old O2 sensor onto the new one, but it is the correct sensor. I'm running a pair of them right now. I'd replace the pair just to keep it all matching.

-Hans
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