I have a 2002 golf 1.6 16V SE which for the last year has had an intermittent starting problem. Working with my local independent garage and following the codes so far they have replaced (at different times) the lambda probes; the temp sensor and the crank shaft sensor. However the problem remains and the codes coming up (injector cylinders 1-4; purge valve; o2 sensor) apparently seem unlikely considering what has already been replaced.

I am now in a dilemma about how to progress with this having spent quite a lot of money and time - not to mention being stuck in various locations with small kids, on the problem. I have contacted my local vw garage who when pressed said that they could look at it (this would cost around £100+vat) and if at worst it was the ecu it would cost around £1000 to fix. To be honest I would be happy to pay this if I was convinced it would resolve it once and for all but there seems no guarantee of this and they do not seem too interested in helping.

Would you recommend I replace the car totally considering its age/current value even if it was reliable or press on with repairs? I don't want to sell the car privately but if undertaking a part exchange would its unreliability reduce any offer enormously? I wouldn't feel comfortable pretending all was well with it.

I would be hugely grateful for any advice, my incredibly helpful independent garage are totally stumped now!