Car not starting

Hello and welcome to 2CarPros. I've looked up your issue on AllData and the only tests that are suggested there would have to be performed at the Volvo dealership, using expensive proprietary machinery and such. So that won't be much good to us.

What I do know though is this: (1) The keys in these cars use a cr2032 battery (aka a disk battery) which needs to be strong for the immobilizer system to get the proper code from the key. Change that battery. (2) If that doesn't do it, try getting under the hood and inspecting the starter for corrosion (greenish whitish powdery gunk) on it's connectors. If you see any at all, take off that connector and clean it off using a wire brush, piece of sandpaper, or something along those lines.

(4) You'll also want to check every fuse that you can find. See the attached images for fuse box locations. And here's a general guide that we've prepared: https://www.2carpros.com/articles/how-to-check-a-car-fuse

Start there and good luck to you! Thanks for using 2CarPros.

Harry

Yes, it's possible. But I'd like to rule out the other possibilities first. Go ahead and replace the battery in the key if you haven't already. Also, have the key tested at the dealership (most dealers will do that for free or a very low cost).

Which body style S40 do you have. In the middle of 2005 there was a change in body. The old body style had the traditional key with chip. The new body style has the black plastic key.

Do you have another key and have you tried using that that as well?

Please let us know what you find. We are interested to see what it is.

Makes sense, please let us know what happens.

Have you run the codes if not here is a guide to help see whats going on:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Run those codes and get that car away from that mechanic. I hate to say it, but it sounds like he's just guessing and changing out parts hoping to get lucky.

I like the Foxwell.

FOXWELL NT301 OBD2 Scanner Professional Enhanced OBDII Diagnostic Code Reader R2092.00

let us know.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help. Start a new question for the doors and window problem please.