depending on your budget, a rebuilt Volvo air pump is cheap (vs new) or expensive (who has $150 for a stupid pump?). Hear is youtube link for a cheaper replacement. Looks easy to do. Let me know if this works to satisfy the P0410. Thanks

My 98 V70 turbo was giving me a P0410 which was intermittent before today . Could not hear pump operating. Read a post (cannot relocate) about diagnosing before spending for pump and valve. On the 98, pump relay Hella 4RA is the same as the engine relay located next to each other in main fuse box ...

The information below, from pfeener was extremely helpful! Thanks sir. Getting a P0410 code on my 98 V70 and will follow the procedure. Will let the board know what happens. On a 98 S70 the air pump relay is up top under the hood on the left hand side right in front of the main fuse box. It's ...

My Volvo experienced this problem. Temp gauge was at 1/4 (normal 1/2 when warm) at 30 degrees F. Car would crank and fire after cranking multiple times (got worse over time). When started, idle leveled out and ran well. Started up normally when warmed up. After a week, got worse and when car was ...

Thanks, this was very helpful. Great pics!