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emission system service required and check engine light S80 1999

posted by  someone claiming to be Sandy on  Tue May 11 07:59 CST 2004 [RELATED]

Hi,
My 1999 S-80 T6 is acting up again. The computer shows "emission system service required" and on the other side the check engine light comes on. It stays like this for about 3 drives then the emission system service required goes out and the next drive the check engine light goes out & everything is back to normal. No change in how the car drives. Twice in the past 2 week, 2 days apart, the car following me started flashing their lights like something was wrong. Upon arrival at home, the lights work fine, the tires are fine. The shop found codes ECM-261A, ECM-271A, ECM-901E, and ECM-903F. When they found this the lights had gone back to normal the first time. It has done it twice since. The last time I drove both lights were on. Does anyone know what is going on & if it is something that must be fixed? It is out of warranty & I take it to a private volvo shop. Any info would be appreciated.
Sandy






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