On 27th September 2016 I bought an Innovate mtxl wideband for £162.50 (sensor amd sensor control unit for my car).

This was installed by a professional mechanic on 10th October 2016.

On 11th November 2016, less than 1000 miles later, the sensor failed.

I contacted the company I bought it from requesting a refund

but they would only offer a replacement sensor which I eventually accepted.

The replacement was fitted on 21st April 2017 (the car was in stotage over winter),

the replacement sensor then failed on the 26th April 2017 with the exact same error code (E8) again less than 1000 miles later.

I have again contacted the company who sold me the product and they now state that there is no warranty on the product and the first replacement was out of the goodnes of their heart.

Having googled "innovate e8" there are many, many others with the same story.

I do not believe this product to be fit for purpose or of sufficient quality.

No way a sensor on a car should need replacing every 1000 miles.

The manufacturer of the sensor claims an average sensor life of 80,000 km

and other manufacturer's controllers that also use this sensor do seem to manage this.

I sent the company a letter explaining I do not feel this product is fit for purpose and they responded (in a rather unprofessional tone) they they would not be refunding me.

What else can I do to try and resolve this issue?

How did you pay?

By credit card.

then a section 75 reclaim to the credit card company as they are equally responsible.

just for ref

WARRANTIES are not worth the paper they are written on

CRA is your friend.

they've had one change now they must refund

their response doesnt take into account of the law and timescales set by normal application of the law in these matters.

buy something electrical new and you get 2 years worth of use from it or some settlement for it being unfit for purpose or of unsatisfactory quality.

For a bigger item like a telly then it is now 5 years before the law considers it to be past it.

Write to the company in a proper letter and tell them that you wish to rely on your consumer rights and that the goods are not of satisfactory quality and unfit for purpose and therefore as a replacement was the same poor quality you now want a full refund.

If this is not forthcoming you will be taking legal action to recover your monies via the county court.

Please refund within the next 14 days to avoid such action.

This is an alternative to a S75 claim against your CC provider.

If the card provider sods you about name them as a co-respondent in any claim against the supplier.