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Well you have two different issues. The p0121 is going to be your throttle position sensor fault and that's why wiggling the wires changes things. It's seems you have a poor connection at the sensor at the throttle body. As for the p0011 that is for a camshaft solenoid. Those are very common. If you google 1999 Volvo S80 camshaft solenoid you will find what it looks like and how it operates. Your issues are very easily solved. And again are two separate issues. Hope this information helps Please take a second and click the box and rate my service GOOD OR EXCELLENT SERVICE if you feel I have been helpful and please request me in the future. If you feel I have not been helpful please DO NOT RATE BAD OR POOR AND WASTE YOUR MONEY , I will opt out to see if another expert can provide more or better assistance so you're not wasting your money!!. Thanks for choosing just answer. Lou. also , if you feel i deserve one , BONUSES are GREATLY APPRECIATED ! 😉 Keep in mind then when you rate it does not end our conversation. you can still return here to me for follow up information if needed, Lou.
I see four screws , not sure if we are on the same page can you upload a photo ?
Here's what I find , is this what yours looks like ?
It's one of them on the side. I don't know which one exactly. Which one did you wiggle wires to?
Ok is the sensor on the bottom also round ?