The dreaded "Check Engine" light is on on my Ford Ranger 95 STX SuperCab, 6V 4.0. The raster says it's "EGR" but nothing else. I've heard a lot about gasoline quality or the cathalizer, but the cathalizer is good and I can't change the gasoline. I'm in Brazil, where the gasoline has around 25% of ethanol on it. What can I fix or change to turn it off? Thanks.

  • EGR = Exhaust Gas Return. What makes you think you have a gasoline problem, as opposed to an EGR valve problem? My 1991 Ford 4.0 V6 needed EGR valve replacement at around 90k miles... Oct 3, 2023 at 12:46
  • This is something that is commonly believed in Brazil.
    – Ivan
    Oct 7, 2023 at 9:50
  • Solved by switching the EGR valve.
    – Ivan
    Nov 15, 2023 at 16:52

1 Answer 1


I fixed this warning by replacing the EGR and the DPF valves, and now the engine is more responsive and no more Check Engine light on.

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