Check engine light still on after replace O2 senors and ECU and EGR

Asked by May 03, 2012 at 10:27 PM about the 1999 Ford Taurus SE

Question type: Maintenance & Repair

I had a friend replace the O2 sensor under the exhaust because thats what the emissions code said and that check engine light stayed on so i replaced the ECU unit and EGR valve and took it back to emissions after driving 300 miles.  highway...street, etc.  Emissions came back with the same O2 sensor code.  Can anyone please help with any suggestions???

1 Answer


What is the actual code? You could have catalytic converter issue, vacuum leaks, fuel regulator, etc. Need that code to figure out where to start

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