1993 is a OBD 1 system so you must pull out the 15A EFI fuse under the hood for at least 30 seconds. Or unhook the battery for the same amount of time.
If the check engine light stays on for the Nissan Pulsar n16, you would need to check the engine in order to clear codes. You can take the car for service and the problem will be diagnosed and restored to normalcy.
There are hundreds of different codes that can cause the check engine light to come on. It needs to have a code reader hooked up to find out the specific code. Most auto parts stores will do this for free.
Auto Zone will check your engine codes and if you ask they will clear your codes for FREE.
pretty much instantly. As soon as the codes are cleared the check engine light goes off and vice versa, unless there still is trouble. In this case the codes won't clear until the trouble is repaired.
Fix the cause of the codes, and clear the codes with a scanner or by unhooking the battery.
You can disconnect the battery for about 5 minutes and this will clear the check engine codes stored in the computer. If the problem that caused the code has not been repaired the check engine code will just happen again. The only way to get the check engine light to not be on is to repair the problem then clear the codes.
After reading the codes, and repairing them, you clear the codes with a scan tool.
A person can reset the check engine light by using an OBD scanner to clear the codes. This is after the problem is fixed.
Disconnect the Battery. Negative prefered. Wait a couple minutes and reconnect. This will clear codes on 1994 and older. If the light comes back on, check the trouble codes and a repair may be needed.
check obd2 with scanner for trouble codes find problem, fix or replace sensor or part, clear codes with scan tool
you can either purchase a computer programmer ($200-$350+) that will allow you to check and clear codes as well as adjust computer settings for maximum performance or take the vehicle to most auto parts stores that can check the codes for free.
Either try disconnecting the battery for about 10 minutes or have vehicle scanned to determine problem and clear codes