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How to diagnose 'check engine' light?

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07-22-2006, 08:42 PM

e430guy

e430guy is offline

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Join Date: Apr 2004

Location: California

Posts: 12

How to diagnose 'check engine' light?

I have to do a smog check on my '99 E430 in several weeks. The check engine light has been on for awhile and needs to be fixed. It used to be fixable by either adjusting the gas cap or rubbing vasoline on the cap gasket. I replaced the cap to no avail. Is there a port for the OBDII diagnostics I can plug into? Where is it located?

thx

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