Not in the short term as long as it is running OK. You may see you gas mileage suffer some. Take it to a Advance Auto or Auto Zone to see why it is coming on. They will check it for free.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Frontier Light Horse was created in 1877.
check for blown light bulbs ,then check for broken wire at lights
P0303 : misfire cylinder #3
check your brake fluid levels
I was told by my mechanic that the bulb is hardwired straight to computer, therefore there is no fuse.
The first thing to check is low brake fluid. A leak in the system or worn brakes causing the fluid to be too low is the most common cause for the light to be on.
According to my references, there was no 1997 Nissan Frontier. It may be a 1998. Check your owner's manual for the procedure on changing the "center high mount stop light" commonly referred to as the 3rd Brake Light. It may be a fairly specialized bulb since it doesn't come up on the list below.
how to change a rear break light on a 1998 nissan frontier four cylinder?
I just had this problem on my 98 Frontier because the brake lights were staying on. I had to replace the brake light switch and the brake light button for it to go out.
on a 2004 Nissan frontier changing the small marker light on the driverside (clear one)?
It is a light that illuminates when the vehicles computer has detected a problem in one of the eight operating systems monitored by the computer. You will need to have a diagnostic performed to determine what code is set and what is causing the problem.