96 burb fuel injectors

took my 96 burb to the shop and they said the code read P0175, P0172 and P0430. Said that all the fuel injectors needed to be replaced.
I have already replaced the front O2 sensors.
I trust the guys at that shop, I've been going to them for about 17 years but I wanted to see what you guys say about it.

Any thoughts?

thx

Well, two codes could be caused by bad injectors. The P0430 is usually a bad cat on the passenger side, but I wouldn't replace until the other codes are fixed. The most likely suspect for the P0172 and P0175 codes would be the fuel pressure regulator, followed by leaking injectors and pinched return fuel line. An unlikely cause for the P0172 and P0175 would be a problem with the base timing of the engine but it would most likely be accompanied by a misfire that may not set a trouble code

A fuel pressure test may determine a faulty pressure regulator. With the key on, engine off the pressure should be 60-66 psi and the pressure should not fall after the fuel pump shuts off