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Old 11-02-2006, 01:49 PM
Registered User
Join Date: Jan 2005
Posts: 6
Check Engine Light 1988 560sl


The check engine light on my 88 560SL is on and I can't find a reader for the diagnostic code. Car is running fine. From what I have read, it is OBD not OBDII.

How can I read the code setting off the light? Are there any sources for a OBD code reader? (I have found a ton for OBDII) I remember reading somewhere that there was a way to jump the connector so that the flashing of the panel lights indicated what is setting off the light. Is this true? Does anyone have any info?



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Old 11-02-2006, 06:12 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
on the 88 560sl the cel only comes on when the o2 sensor sees a voltage that is stuck and not changing i.e. .950 or .001 .if there is nothing wrong with way car is running then maybe o2 sensor bad.there are other things that can cause the k jetronic to run rich or lean and trigger the cel but you say it's running fine.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 11-02-2006, 07:22 PM
Registered User
Join Date: Jan 2005
Posts: 6

Thanks David.

Without having anything else to guide me in a direction, I was going to change the O2 sensor. It's the simplest potential fix and from reading many things online it seems to be the most common problem.

The check engine light went on and off intermittently for a few days, then has stayed on constantly. I've notice no difference in performance.

Thanks again.

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Old 12-20-2006, 09:02 PM
Registered User
Join Date: Jan 2005
Posts: 6
Changed O2 sensor Light still on

I changed the O2 sensor, but the light is still on. Any suggestions? I there a way to read the code without a scanner/reader?


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