I have a 2016 1.6 tdi with 125k miles on the clock. The car is showing symptoms of what I think is probably injector issues. It's definitely down on power, MPG is down, struggling to accelerate uphill, just feeling slower than it did plus I get the occasional blip which feels like a misfire on a petrol engine. It's not the turbo which cuts in as it should.

OBD11 showing no faults.

Is it likely to be injectors? If yes how can I tell which one? I'm assuming only 1 given it doesn't feel "too bad". I've bought a fuel additive so will try that when it arrives.

If it is the injectors, it doesn't look too difficult a job. I'm reasonably competent and have the tools needed but am I missing anything which may make it more difficult than it looks? Do new injectors need to be coded? If yes what is the process?

Grateful for any help or advice

A good mechanic can test the injectors for either leaks or sticking solenoid. Typically injectors will do up to about 120k miles before being replaced. Try to replace all 4 if they need replacing.

Other things to check: high pressure fuel pump; fuel filter and check for leaks on the fuel injection system too.

You could also run several tanks of super diesel though and see if that cleans out the injectors and valves.

Thanks for the reply. I will get it booked in to my loxal garage and see what they say