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Old 04-18-2001, 05:47 AM
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MBenzNL MBenzNL is offline
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
The check engine lights will come on (when something is wrong) and will go out when everything is OK again.
The car's compu will remember the faults and the dealer when necessary can read them. Just connect the sensor and if everything is OK, the light has to go out again.
No need to disconnect the battery...

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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