2006 Volvo XC90 gives "no oil pressure" warning when revved above the red line for more than a second.
Following advice from a Volvo forum I used motor cleaner and changed the oil (twice) attempting to remove sludge.It got better after the first change but no difference after the second one. Once, after the warning light came on it made some bangy clanky sounds that I didn't notice until I slowed down and rolled down the windows. So I don't think it's a sensor issue. Anyways turning the car off for ten seconds makes the issue go away.
Instead of fixing that I just want to lower the rpm limit. Is that possible?