Volvo s40 wont start been told its dieselinjector problem

try a different key, also can try unlocking driver door with key to disable the immobilizer

A weak battery will make the "clicking" sound you hear, also bad connections, loose battery cables or worn battery cables. Jump start the car to see if it cranks, if it does, charge or replace battery.

We just had this problem, and we replaced the battery - it was due- but a properly recharged battery should solve this.

first check your compression if that checks out have your alternator tested it can cause the engine not to start

I had the same problem with my 2005 s40. I took it into the dealer and they told me it was "A faulty AC clutch." Apparently this part turns the compressor on and off in the car or something along those lines. It was covered under my extended warranty but the total invoice cost was around 400 dollars.

my 04 did the same thing-my mechanic has a friend at volvo they finally told him the drain on the sunroof clogs up based on the design- they have a repair kit-get it done asap-had to rip my carpets out- they want 500.00 each on the carpets....

will have to get it towed to the dealer to have car and key reprogrammed

sounds like you need a new battery, it probably isnt running enought cranking amps to start your car, try a different battery and it should start fine

no such switch

my car volvo s40 2000 had problem with engine managment light. I took it to the garage & they did dignostic check and the problem was(reset the camshaft valve)he gave me the part nomber and i put new part in ad problem solved.i do not know the name of part but this part is next to the spark plugs on right hand side,its got 4 bullts and the wire pluged in to it. It might be not problem with your car becaus macanic told me that this is not the common foult with s40, with yor car it may be sensor. good luck