We are in the same boat and my Antara has not been starting right for 1 year. I find no experts on this web site proposing fixes. First the car would progessively not start and idle, starting hot is my only problem now. I changed the high pressure fuel pump after bad Vauxhall dealers advice. This is my horrible story.
First problem progressively would no start cold.
Second problem would not idle
Third problem would not start hot without a ton of throttle.
Vauxhall dealers told me it was the high pressure fuel pump or injectors. EGR was fine. I changed the pump at a cost of 720 pounds only to discover the fuel filters under the car were caked with goo. Once changed it starts cold and idles well but wont start hot.
Items first and second resolved but not third.
No codes other them P200A all the time which has no impact because the manifold flaps only open above 2,000rpm. They are always closed for starting being moved by engine vacuum.
The strangest thing is if I shut the car off hot and don't remote lock the door the engine starts hot. If the door is locked and unlocked with the remote it does not start. The remote has a coiled that gets it power from the steering column. I wonder if the ECU does not see the remote working or disables the starting. My Antara has some of the best mechanics baffled due to no codes we are all lost.
Can any diesel experts please help, I've read numerous posts here but I'm still stuck. I recently bought my good lady a 2012 Antara 2.2cdti s/s with 63 k and a known oil cooler failure. The car drove fine on and off the trailer and up to the garage but after a week of sitting battery disconnected whilst I got the cooler it wont start and there are no codes. I had the code P0340 but only as a pending which hasnt come back since changing the camshaft sensor.
According to my scanner the fuel rail pressure is good, there are drips of fuel on the leak off side when cranking ( I havent cracked off anything pre injector) , half tank of fuel. Scanner reads 250/300 rpm cranking and 10.5 v, The glow plugs are heating fine too.
The only thing I thought iffy was that the egr valve buzzes loudly when the ignition goes on and keep buzzing for about a minute after I stop cranking. I took it off and cleaned it tho it was pretty clean. With the top electrical part off I can see that it rotates anti clockwise when the ignition goes on. I assume this moves the valve and thought perhaps the excess buzzing was it trying but failing to open. I've tried changing the valve position manually with the electrics connected but still it wont fire. I've even tried easy start but although it coughs briefly it wont run.
Any help would be appreciated as its driving me nuts !!