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UPDATE cel S70 1999

What kind of a shop did you go to? There is no 'mainstream O2 sensor,' just a front and/or rear O2 sensor.

Before plunking down hard earned dollars to fix it, I would first look for any vacuum leaks around the intake manifold. Any small air leak will cause the engine to run rich and foul the O2 sensor.

It is OK to drive the car in this condition. Just a word of warning, if you keep the rpms below 2,000 you might have the engine stall at idle speed because of dirty plugs.

Klaus
--
Proud owner of a 220S. If I had more room, I would have more Volvos.






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