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What's the first thing t check when warning light comes on?

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Old 11-23-2011, 07:03 PM
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FIA-F1
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Default What's the first thing t check when warning light comes on?

Here's the backdrop:
1991 944 S2 cab with 86K miles.
All fluids new and up to proper levels.
Car runs fine with no known issues.
All electrical appears to be fine.

I would imagine there is a sequence most pros go down troubleshooting the engine warning light coming on(?) Thanks guys.
Old 11-23-2011, 07:04 PM
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CEL on or blinking? There is a difference.
Old 11-23-2011, 07:10 PM
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It's just is on steady
Old 11-23-2011, 07:11 PM
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Gas cap. Oil cap. Get the code(s) read, and post.
Old 11-23-2011, 07:25 PM
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Didn't know a 944 came with a warning light.
Old 11-23-2011, 08:54 PM
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Cra$h
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I'm not familiar with the later models, but if it's the exclamation point in the center, I believe it will light up for more than just engine issues. Parking brake switch? Can't remember for sure, but I think that's one of the triggers.
Old 11-23-2011, 09:12 PM
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944V8inDFW
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brake pad sensors
Old 11-23-2011, 09:13 PM
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emergency brake switch
Old 11-23-2011, 11:42 PM
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Yep... Id check the e-brake switch first...
Old 11-24-2011, 08:45 AM
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Ok, this is helpful. I'll check those out. I don't have a code reader.
Old 11-24-2011, 12:18 PM
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Originally Posted by FIA-F1
I don't have a code reader.
FYI. Some autoparts stores have code readers, and will do this for free.
Old 11-25-2011, 09:12 AM
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If you are talking about the check engine light and not the central warning lamp you can, I think, read the codes like you can in a 968.

http://www.durametric.com/porsche968faultcodes.aspx

Note - this only works in the 1991 S2 and not the earlier models.

If you are talking about the central warning '!' light you need to figure out which other warning lamp bulb should be lit and maybe has had the bulb removed. This is often the air bag lamp. All these should light with Key On Engine Off so you can just look at what is lit and what isn't at that time.

-Joel.
Old 11-25-2011, 10:12 AM
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Sorry, I should have clarified...it is the central warning lamp with the big exclamation point in the middle. I will try and track this down this weekend. Based on what has been suggested here, it would seem the warning lamp would indicate some issue not life threatening to the engine (at least so I can start it up if needed).
Old 11-28-2011, 01:04 AM
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Make sure all your warning lights are in working order (putting the key on before starting).

For example, your ABS could be kaput, but the bulb is out or pulled from the cluster, and the big ! is on. So, make sure they all light up with the key on!



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