An oil pump on a 1994 Honda Civic is found in the bottom end of the engine. To replace the oil pump the engine will require a rebuild as the crankshaft will have to come off as well.
The oil pump on a 1992 Honda Civic is located underneath the engine. The pump is placed through the crankshaft and as the crankshaft spins it operates the oil pump.
Take it to a Honda Civic garage / mechanic.
The recommended oil change for a 2002 Honda Civic is every 5,000 miles. If synthetic oil is used oil can be changed every 10,000 miles.
buy a manual or go to pro, cheapskate
Oil Change
A 1 Honda Civic 8th Gen. : Oil change + Tire rotation
You should change the air filter in your Honda Civic when it is dirty or at every second oil change. Most filters will last for two oil changes through standard daily driving.
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drain the oil.Pull the oil pan.Pull the belts off and the crankshaft pully.Pull off the oil pick up tube.It is held with 3 bolts.Pull the bottom driverside of the block apart.The oil pump is inside.You need a Honda manual for this job.
NO.An oil change will not harm the sensor.
My recommendation is every 5,000 miles change the oil & filter.