sorry to double post
but some people post in one section only
diesel vectra common faults
1. Injector #3 wiring loom: This is a blatent design fault, complete ****-up by vauxhall. Good news is it's cheap to fix, especially if you DIY.
2. Throttle body: A manufacturing fault sometimes causes a solder joint to break. Easily and cheaply fixed with a soldering iron and some solder - usually no need to buy a new one.
3. EGR valve: This can sometimes get clagged up and cause problems at 60-80k miles, maybe sooner if used on a lot of short journeys or around town. Usually cleaning fixes it, but sometimes a new one is required. This problem affects many modern diesels and is inflicted by EU emission regs. I don't consider this to be vauxhall's fault.
4. Intake manifold/swirl valves: Swirl valve bearings wear out at around 80-100k. Crap design, blame vauxhall entirely for this one. Only solution is to fit a complete new one. Not an easy DIY job, so expect to pay a garage around £700 for this.
5. Dual Mass Flywheel: Usually knackered by 100k miles, maybe sooner if abused (harsh gear changes, stalling, etc). I'm in the same camp as many others on this forum - this has to be considered a very expensive service item as the same problem seems to afflict most car manufacturers. Not an easy DIY job, so expect to pay a garage around £650.00
6. Diesel Particulate Filter: Only fitted on Vectra Estate and Signum IIRC. Not usually a problem provided the car gets a decent run - at least 20 miles at high speed every few weeks. If it does fail, it can be removed and ECU remapped to disable it for around £150-300. Will still pass MOT test without it.
just wondered your opinions