Service Engine light!!

[Romeo5k]

OKay, just got car out of shop yesterday. They replaced #5 injector. As it was not working. Car was shaking hard. And had service engine light on. And frigggin Low oil light keeps flickering. ANd i was leaking oil. So got #5 replaced and they tested the rest of them after putting #5 back in and #5 read at 11.0 i think, and the rest were between 11.0 and 11.4. So i told em leave the rest. They changed 2 hoses, 1 was bad other was gonna be bad one day. Changed the oil sensor switch ( ithink thats whats its called.). It was leaking oil. I dont know why. Its been changed like 2-3 times already. SO i stat car, and drive, no problems, no shaking. Get on high way to about 65 or so i guess. And service engine light comes on. WTF.. Now what. Im supposed to go back friday for them to scan it. But i want to know something. Did i/they miss something? Or is this normal? And whats with that stupid oil switch. Its the reason why the LOW OIL light kinda flickers from what i hear. But yet, doesnt work to save my life. Every time i am drving fast and slow down instantly to a stop, light flicker dimish red, solid red, dimish red then its gone. But it felt like the car was going to shut off.. So everyone shoot.

[qship96]

Are you saying the oil light still comes on/flickers AFTER they replaced the oil pressure switch? If so, this could be a major engine killing low oil pressure problem- they need to check oil pressure with a gauge to determine true oil pressures and go from there. The check engine lamp may be on due to a missed vacuum hose connection after tearing into plenum, or something left disconnected, getting the code read will lead to the cause. I am surprised you have had soo many leaky oil pressure switches- my original lasted over 225K- are you keeping up with frequent oil changes?

[Romeo5k]

yea i am.. im staying within 4k miles using synthetic blend! VAlvoline and Valvoline filter!

[Romeo5k]

correct.. vaccuume hose missed.. and for some reason.. knock sensors code coming up./... Oh my lord now what??