Service Engine Soon Light

2001 NISSAN FRONTIER
70,000 MILES • 4 CYL • 2WD • MANUAL
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JBIZZLE
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The other day my service engine soon light came on, and has remained on. I looked it up in my owner's manual, and all it said was to check and make sure my gas cap was screwed on tight. It then stated that after a few trips the light should go off. Well, I did and it hasn't. The only other alternative is to take it in and I am new to my area, and I don't have a mechanic yet. I looked at all of the fuses and checked underneath the hood for any loose connectors, etc. Any suggestions before I take it in?
Jun 4, 2008 at 10:07 PM
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LEGITIMATE007
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I would bring it to autozone, or your local parts place for a free scan, then you can post the results to me and we will take it from there, in the mean time make sure all of your fluids are correct.

Read the guide below, it will help . You may still need a scan to find out the code


https://www.2carpros.com/articles/check-engine-light-top-ten-reasons
Jun 5, 2008 at 5:59 AM
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IDIVER
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Truck is running normal
Service Engine Soon light came on, took to a "Autozone" Got error code
P0420
"Catalyst Efficiency Below Threshold"
Bank 1.
Replaced up-stream (engine manifold) Oxygen Sensor With Universal fit 3 wire, 1 white 2 black O2 sensor. Reused original plug from old O2 sensor, making sure to rewire it the same as to original.
Took back to Autozone, cleared error code. Ran truck at highway speed for about a 1/2 hour, Service Engine Soon light came back on.
Now what? HELP!
I'm trying to avoid taking it in to be serviced, if I can. Don't have the $$.
Thank you for any help!!
Jun 1, 2019 at 7:10 PM (Merged)
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BLUELIGHTNIN6
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a dirty MAF sensor can cause this code to appear as well. make sure MAF sensor is clean , if its OK then the cat. converter may need flow tested , if its clogged or partial clogged it will also throw this trouble code.
Jun 1, 2019 at 7:10 PM (Merged)
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IDIVER
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[quote:cfed9462d1="bluelightnin6"]a dirty MAF sensor can cause this code to appear as well. make sure MAF sensor is clean , if its OK then the cat. converter may need flow tested , if its clogged or partial clogged it will also throw this trouble code.[/quote:cfed9462d1]

Sorry, I'm not a mechanic. What, and were is a MAF sensor? Is there some-wear I can get a PDF image?
Thank you
Idiver
Jun 1, 2019 at 7:10 PM (Merged)
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BLUELIGHTNIN6
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MAF is mass airflow sensor which senses the incoming air into the engine. assuming you have the 2.4L engine, it will be located on the right side of the engine, near the throttle body (pic below). https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf


https://www.2carpros.com/forum/automotive_pictures/261618_Noname_2774.jpg

Jun 1, 2019 at 7:10 PM (Merged)
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IDIVER
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I'll give it a shot . Thank you
Jun 1, 2019 at 7:10 PM (Merged)
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FRANK VELEZ
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Code is 1446 What is the cause of the problem and how is it fix
Jun 1, 2019 at 7:10 PM (Merged)
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DOCFIXIT
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Hi Fault with Evap Canister Control valve need a diagnostic scanner to do testing. see diagram locate and see if hose good or anything looks damaged.


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_269.jpg

Hope this helps Thanks for donate
Jun 1, 2019 at 7:10 PM (Merged)