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Diesel Box Sensor Issues

cbennett1991
cbennett1991
in Ford Focus Club

Featured Replies

Has anyone came across any issues with NOx sensors. I have potentially had to have mine replaced 3 times in the space of 20 months. 

Reference I drive a 2020 Focus Diesel 1.6

Surely I can't be going through these sensors at this rate, the parts should be good for 10 year surely. I'm wondering at this point if its electrical? 

 

Any thoughts?

  • Quote


    2 hours ago, cbennett1991 said:

    Any thoughts?

    Well I would be claiming warranty on the parts for a start, and using a different garage for the second thing.

  • Quote

    Parts good for 10 years? I think not. Nox sensors are notorious for failing early and often. Ive done plenty with 10 miles on the clock. ( Not focus I should add) 

  • Quote
    • Like 1
    • Author
    9 hours ago, unofix said:

    Well I would be claiming warranty on the parts for a start, and using a different garage for the second thing.

    I've taken/taking it back to the garage in which dealt with it last night (dealership) as it was replaced in May and part is guaranteed for a year.

     

    I had a fiesta beforehand and had zero issues with it and it was a diesel too. 

    Just seems like new cars or at least newish cars are built so crap these days 

  • Quote
    44 minutes ago, cbennett1991 said:

    Just seems like new cars or at least newish cars are built so crap these days 

    @Sanddancer would probably agree 🤣

  • Quote
    • Haha 1

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    • The Digestive Forum Roundup (24th May - 31st May 2026)

      Steve ·
      The Digestive Forum Roundup (24th May - 31st May 2026) We hope this email finds you well and enjoying your week. As always, our forum has been buzzing with activity, so we’ve compiled the highlights for you. Plenty of interesting discussions are taking place, especially around the Ford Focus and Fiesta models. Starting off with the Focus, many members have been discussing issues with the Emergency Call System, particularly in the Mk4 model. PLB raised concerns about persistent malfunctions, a se
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