Audi mobile A4

I have got it repaired. The cost for repairs was eye watering and much more than the vale of the car. As I started the repair, I could not cut my losses and leave without repair.

First I wish to Thank You for your informed advice. I was perhaps not totally clear with my post. Sorry. When I took my car on a loader, and my mechanic looked into it few days later, I presume after plugging in diagnostics. He offered me both means. One to change the whole system and he explained it will cost with Labour over the value of the car. Two..Just remove the diesel, clean the passage and change the HPFP. This I opted. Then few days later (he needed time to order the part and repair) called me to inform that now 2 injecters are showing fault(I don't know how he identified) and need replacement. At this point as I have already need to pay for what ever repaired and the car still will not move/run, suggested if it would be more appropriate to change the whole lot as was in his first suggestion at the onset. I was too worried if I not change the other filters and pump theses fragments will block any of the (new as well as old) injectors and make my car non viable. (Now after reading your reply, It is clear to me that there are filters above each injector and my suggestion to change the whole lot is over kill!!) It is too late for me to alter the repair but would be obliged for your opinion on my reliability to run for at least next few months? (I was so taken back the way car engine died on me as I was just driving away)

Audi A4 SE TDI 6SP (year registered 2009) has done 107000 miles - single owner me. Regularly serviced. Remember from memory changing particulate filter at the last service in Aug 2020. (Car did go to the dealer at some point few years back in the past to update the software after the Audie debacle & emissions) A week prior to failure I thought I could hear very faint unusual sound driving then said to my self I am imagining (doubt/thought my self if my exhaust about to fail). No sign of a failure in advance, one morning on first start very unusual noise top near the fan belt under the bonnet. When I start to pull away into 2 gear & 100 meters car died. It would crank but not start. Took it to my mechanic on a loader. He'd found metal shavings in HPFP. Now I am adviced to change the whole fuel system or 4 X injectors, fuel rail, pumps near fuel tank along with HPFP.. Parts plus Labour is greater than I presume the value of my Audi of 2009. Is it common problem for a diesel engine that has done 107000 miles? (I use to hear that diesel engine will last longer than petrol ) Could I trust my car for another year after this expensive repair on motorways? (The way car cut out made me worry)