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Old 07-26-2019, 11:12 AM   #1
Tyson
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2002 L-Series 3.0L Sedan
Default Service light

Does anyone know why my service light comes on. Doors will unlock also

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Old 07-26-2019, 12:10 PM   #2
Dsaturn
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2001 L-Series 2.2L Sedan
Default Re: Service light

Go to an autozone or the likes, Have them read codes then report back.

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Old 07-26-2019, 12:41 PM   #3
Tyson
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2002 L-Series 3.0L Sedan
Default Re: Service light

Had autozone read codes. Nothing. But I donít believe the scanners they use can diagnose service lights. Just check engine lights

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Old 07-26-2019, 01:18 PM   #4
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2001 L-Series 2.2L Sedan
Default Re: Service light

If it is the wrench light then I think but I am not sure of this you have to take it some place that has a tech 2 reader. Also some service light codes have to be read by a tech 2 reader.

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Old 07-26-2019, 02:16 PM   #5
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2003 L-Series 3.0L Sedan
Default Re: Service light

Tyson, since you know there are two different service indicators, please specify which one. The indicator with a wrench symbol is the wrench light. The indicator showing an engine symbol is termed; malfunction indicator light (MIL), service engine soon light (SES) or check engine light (CEL). Basically you have either a wrench or engine light. Which one is it? Calling it a service light is misleading everyone. There are two service lights.

Wrench indicators cannot be read by universal readers or scantools because wrench codes are manufacturer specific. Engine light codes are emissions related and universal to every vehicle sold in the USA since 1996 adhering to OBD II. Engine light error codes can be read by almost every reader/scantool like the auto store readers from AutoZone, AAMCO, personal readers bought from Harbor Freight, eBay, etc. Wrench codes, in this case Saturn/ GM are only decoded by GMs scantool, a Tech II device capable of reading every GM vehicle, update eprom chips, program replacement remotes, activate individual solenoids, etc. An extensive tool dealers must have. Used ones are available but they're still pricey. And a subscription to GM online services is required for some features.

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