I have a 1995 altima with a PO400 and a PO325 code are they related ?

Question

I have a 1995 altima with a PO400 and a PO325 code and the temp gauge bounces at idle and pegs on the low side under acceleration, any thoughts on where i should look? Are these problems related ?

Answer 1

P0400  Exhaust gas recirculatiion malfunction

P0325 Knock sensor circuit malfunction

Could be related to temperature, If the coolant is not proper and is low maybe from a leak ,then yes the EGR would malfunction and your engine will set off a knock sensor code,