Oil pressure sending unit, or depending on the year it might be the computer as well. If it runs ok and doesnt make a whole bunch of noise and bang and rattle then its fine to drive to the shop to get it fixed.
With the thermostat.
my gas gauge is not working what could be the problem
belt is stretched buy new one( serp. or single alt.).
If the temperature gauge is not working, one thing it could be besides the gauge itself is a blown fuse. Another possibility is a loose or broken wire on the gauge.Ê
Could be temperature sensor Could be gauge
There are several reasons why a gas gauge could stop working. A short in the wire from the sending unit could be the culprit. The computer that controls the dashboard gauges could be going out.
If it's a heavy gauge (around 8 AWG IIRC), that's the charge wire to the alternator BATT post. The larger cable (about 4 AWG) goes to the starter.
the problem could be that the enegn is jamed
If your gas gauge is not working on your 2000 Impala you need to take it in to a repair shop. There could be a fuse that needs to be replaced to prevent you from running out of gas.
The reason for the failure could be a failure in the connection or the gauge itself. Alternatively, the temperature sensor could have failed.
It could be the fuse, but mine is because the floater that measures for the gauge is stuck.
This is a long shot: Take a jumper wire from the engine block to a good chassis ground. Sometimes the engine/drivetrain is so well (electrically) insulated that various items won't work if the bonding strap was left off. You'll oftentimes find that the bonding strap is connected to the head and may have been overlooked during an r&r.