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Service Engine Indicator. 900

uid 39390's pic
posted by  EJO on  Wed Dec 27 05:08 CST 2006
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last visit: Wed Jun 17 05:55 CST 2009
[RELATED]

My '94 940T Service Engine light always stays on for 2 to 4 minutes after I start the car. After that time is goes out.
The car has 189K (miles) on it and the engine seems to run fine.
What is this light telling me?
Do I need new O2 sensor, or AMM?
Or should I just disregard it it keep on trucking.
Thanks in advance for your input.
--
EJO now a 1994 940T 190K; ex '63 123S; ex '75 245; and ex '81 242GT






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