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need help with emissios 700 1986

posted by  someone claiming to be Mark H on  Mon Jan 9 03:01 CST 2006 [RELATED]

Can anyone give me advise why my car is failing emissions on high HC and high NOX? Car is passing CO. The car is a 1986 760 Turbo Wagon with 252000 miles. The car was recently tuned up, air box thermostat is fine, car seems to be running well. Any advice as to where to start would be appreciated. I am wondering if this could be an oxygen sensor problem. I have not changed it in many years.

Thanks,

Mark H







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