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Replacement of O2/Lambda Sensor on a Ford Focus Mk.4 hatch

Ant_S
Ant_S
in Ford Focus Club

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A few weeks ago the Engine Warning light came on.

I went to my local garage almost immediately and they diagnosed a faulty catalytic converter sensor.

They reset the fault and told me the car was safe to drive.

For various reasons I didn't use the car for a couple of weeks but when I did the EW lit up again.

I went back to the garage and they replaced the sensor on the same day.

What surprised me is that it was done under warranty.

I've done a bit of Googling and nothing I read indicates that the warranty covers a car bought new in March 2019 and with nearly 90,000km on the clock.

I suppose I have two points/questions:
1 - Does anyone know why this might be covered?
2 - If you have a similar problem then maybe a good starting point would be "of course this is covered under the warranty".

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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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