SOURCE: service engine light comes on 2007 nissan xterra
Why my Check Engine/Service/Check Engines Soon light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part. THIS IS UNDER WARRANTY UNTIL 70,000 MILES OR 7 YEARS.
SOURCE: my 2007 Nissan Xterra doors locked on their own
Most likely you've got a timed lock programed into your menu parameters. You will have to go to your main vehicle instrumental menu and clear that option. This may have been inadvertantly done by one of the other operators of the vehicle.
SOURCE: 95 nissan maxima wont start
I had a 94 which i fixed this same type of problem by putting in a new distributor
SOURCE: My 2007 Nissan Xterra won't start. When I try to
SEE IF SOME ONE CAN GIVE YOU A HOT SHOT YOUR BATTERY MAY BE WEAK AND THAT CLICKING NOISE IS THE SIGN OF NOT ENOUGH JUICE GETTING TO THE STARTER
SOURCE: 2000 Nissan XTerra Electrical Probs
I was told by a loca mechanic that Nissa has had problems with electrical grounding for some time. Ii had a 1997 Altima that I intened to drive forever but finally gave up at (only) 90,000 miles. It went through 4 alternators in three years. Also a corroded radiator. The mechanic said Nissan has used the engine block as a ground, since cards today don't have the old-fashioned frame rails. Any loosening or other disturbance to that engine block ground will cause electriclaly-charged coolant to flow throughout the system: definition of elctrolysis. I don't if this applies to 2000-and-beyond vehicles, but it did in the 90s. Elsewhere in this section someone posted a ground solution (Maxima) that looks good. These are great vehicles, but if you have one (any make) with a persistent electrical glitch it can be one of the most frustrating and costly problems to fix.
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