Mercedes benz part failed

fishingcinema

At the end may fuel pressure regulator went on my mums mercedes A170 so she brought a new one from mercedes benz dealer at £150 and had it fitted (not by mercedes)

The part has now failed, she knows its the fuel pressure regulator as has had another one put on to test if it was that, so she took the part back to mercedes today and was told that she needs to have the part fitted again so they can test it, if it has failed again then they will give her a new fuel pressure regulator, if it's not the fuel pressure regulator then she will be charged for testing it.

The part is less than 6 months old she returned it in its box with receipt, id this right that she has to now pay again to fit the part so mercedes can test it, is there no way of them sending the part off to be tested, i appreciate that it would probably need to go back to germany.

I have little confidence left in mercedes as going back about 18 months, her car would not start, so a family friend put it on a machine to see if any fault codes came up none came up, she then took it to mercedes and told them about it said it had been on a machine but no fault codes came back, they told her she would need to put it on a machine to see if it had any fault codes and this would cost £65 she agreed but no fault codes came back, they then said that it could be one of two things (a) dis@ £800 (b) ecu @ £1200. and she said if i have the work done will it fix the problem and was told it may do it may not

It turrned out to be euc needed re initalising and done by a gent who worked at mercedes for £10.

any advice would be greatly appreciated as i can not find any terms and conditions for this, i can only seem to find it for vans.

Thanks in advance