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Discussion Starter · #1 ·
Hello all,

I was driving my 2013 Altima S and the Malfunction Indicator Light came on and stayed on. What does that mean? Is it indicating that there is a problem/malfunction with the engine? I currently have 85,945 miles on the car. Any advice will be greatly appreciated.
 

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That could possibly mean that one of the following has failed or is failing: O2 Sensor, Air/fuel Sensor, Catalytic Convertor, etc., but, you won't know for sure unless you have the code read.

At that mileage, I would suspect an O2 sensor, but Nissans can trigger such warnings from simple things like a loose gas cap...try that first.
 

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From the Nissan Altima Owner's Manual, Instruments and Controls section:

Malfunction Indicator Light(MIL)

If this indicator light comes on steady or blinks while the engine is running, it may indicate a potential emission control malfunction. The Malfunction Indicator Light may also come on steady if the fuel-filler cap is loose or missing, or if the vehicle runs out of fuel. Check to make sure the fuel-filler cap is installed and closed tightly, and that the vehicle has at least 3 gallons (11.4 liters) of fuel in the fuel tank.

After a few driving trips, the light should turn off if no other potential emission control system malfunction exists.
If this indicator light comes on steady for 20 seconds and then blinks for 10 seconds when the engine is not running, it indicates that the vehicle is not ready for an emission control system inspection/maintenance test. See “Readiness
for inspection/maintenance (I/M) test” in the “Technical and consumer information” section of this manual.

Operation
The Malfunction Indicator Light will come on in one of two ways:

● Malfunction Indicator Light on steady — An emission control system malfunction has been detected. Check the fuel-filler cap if the LOOSE FUEL CAP warning appears in the vehicle information display. If the fuel filler cap is loose or missing, tighten or install the cap and continue to drive the vehicle. The light should turn off after a few driving trips. If the light does not turn off after a few driving trips, have the vehicle inspected by a NISSAN dealer. You do not need to have your vehicle towed to the dealer.

● Malfunction Indicator Light blinking — An engine misfire has been detected which may damage the emission control system. To reduce or avoid emission control system damage:
– do not drive at speeds above 45 MPH (72 km/h).
– avoid hard acceleration or deceleration.
– avoid steep uphill grades.
– if possible, reduce the amount of cargo being hauled or towed.

The Malfunction Indicator Light may stop blinking and come on steady. Have the vehicle inspected by a NISSAN dealer. You do not need to have your vehicle towed to the dealer.

CAUTION
Continued vehicle operation without having the emission control system checked and repaired as necessary could lead to poor driveability, reduced fuel economy, and possible damage to the emission control system.
 

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It means a problem has been detected and you need to get it checked out.

There must be a couple hundred different codes the engine computer and the numerous other control modules can detect so guessing is an exercise in futility as "Cold Forged" has demonstrated.


Bottom line , get it checked out.
 

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"...guessing is an exercise in futility as "Cold Forged" has demonstrated."
I'm sure that you meant to write "as Cold Forged has indicated."

Otherwise, you are suggesting that my comments are also an exercise in futility. My point was that you would only be guessing until you had the codes read.
 
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Discussion Starter · #7 ·
Thank you all for your feedback. I had it checked and it came back saying that I have an o2 sensor that needs to be replaced.
 

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...I had it checked and it came back saying that I have an o2 sensor that needs to be replaced.
BINGO!...perhaps Nissan-MasterTech will appreciate the irony in that "futile" guess...I likely will not be so lucky in the future ;)
 
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