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CHECK ENGINE PERIODICALLY ON AND OFF

S

ScIlles

New Member
#1
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City
Bonyhád
State
Non-US
Country
Hungary
What I Drive
Ford Focus 3 2011 1.6 Ti-VCT
#1
Hello members!

After an exhaust repair and O2 sensor change (not factory part) the check engine light turns on and off periodically. (Driving for a few miles and it pops on, then turns off after a few days and repeat)
The car runs OK so I do not understand why this happens.

Did anyone suffer from this?
Thank you all!
 
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