P0521 Cadillac -

Question

I have a 2013 cadillac Ats with a low oil pressure light came on after a guy put four new pistons in the car the guy didn't put a new bolt on the oil pump drive bolt for the pully the car had been running bad for three weeks the guy did a compression test and found number four only had 75lbs In it so the guy pulled the motor apart and found one of the landing to be broken so the guy put all four new pistons and rings in the car he said the oil pump pully bolt was a torque bolt but he wasn't able to get the bolt for four day so he reused it after about 20mins of running the oil light came on saying that the car had low oil pressure so he churches it and it was only making about 2.6lbs of oil pressure is there a way that the bolt had came lose and it is not turning at a high speed now the car had a code p0521 low oil pressure light I like to find out more about this problem with my car

Answer 1

P0521 Oil pressure sensor / switch

Low oil pressure if that bolt is not secure then you have a internal oil pressure loss. The sensor is just detecting the condition of it mechanical condition.