Check your fuel pressure regulator. Based on that code, I think it is a fueling issue you’re experiencing. You could try hooking up a scanner to check fuel trims as well to see if it’s running too rich or lean.

I have Volvo S40- 2010 diesel- 1560 cc.
It goes into limp mode when rpm 20000.
Please let me how I can resolve.
Error p0089.

I agree. These sensors are just boondoggles for the industry. What did we do in 1975?

Oxygen sensors. And ur good.

Do a diagnostic check
I think your problem might be fuel pressure regulator

If it’s got 4 wires then it’s fuel rail pressure temp sensor.
Pin 3 temp, pin 1 pressure, 4 sig return, 2 ref voltage.
3 wire is just pressure sensor. There’s a you tube video, cheap ones from amazon can be defective, or eBay, seems doable to replace self, while running pull out fuel pump fuse, put rag underneath disconnect vacuum hose remove bolts, pop in new one, a mechanics gonna want 200$. I replaced one for pressure code now I got temp code, two years later, I don’t notice any loss of gas mileage maybe it runs too fast warming up cause it thinks it’s always 0 degrees out ,?

You’re probably going to need a professional diagnosis on this one, from someone who can see the vehicle in person and hook up their own scan tool.