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Emissions Light Light goes on and off sometimes

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Get scanner and check what it is.

Posted on Apr 27, 2013


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What are the drive cycle steps to reset the system so we can get an emissions test done?

Sometimes it's not just one sensor that is faulty or worn and won't activate the engine light until one sensor is replaced to clear the light. Some vehicles have more than one sensor( such as 2 or 3 catalytic converters could have an oxygen sensor for each converter). I would have the dealership do another scan to locate which sensor is activating the check engine light (CEL.) I imagine they warranty their work for the initial work done recently if that's the problem. Most auto part stores will run a scan for free to detect what part (sensor) is engaging the light.

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Your mass airflow sensor and your o2 sensor may have failed?
Sometimes an after-market cold air intake system, could create problems like your having?

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Oct 30, 2013 | Volkswagen Cars & Trucks

1 Answer

Engine light goes on and then goes off

Dear Fcorrela,

On some makes and model of cars and vehicles, this is acceptable, but if the light is remaing on for longer than 5-10 seconds then you may have a problem with the engine management, even so, get it to a garage and have them inspect the engine and also have an emissions test done too. . . Most problematic engines can be diagnosed by analysing the vehicle emissions.

I hope this is the fixya for you, and please do let me know how you get on with regards to this matter.

Yours sincerely


Feb 07, 2012 | GMC Sierra 1500 Cars & Trucks

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My 1988 F 150 has a dying problem. Sometimes when I stop at a traffic light the truck will die. I have replaced the fuel pumps, the tps, normal tune up parts. I have had the injectors cleaned, the trans...

First thing you need to do is when it stalls out, determine what it's not getting (fuel or spark) then once that's been isolated you can do some testing to determine why. If emissions system isn't working properly it can influence running...check and find that problem as well.

Jun 17, 2009 | 1988 Ford F 150

1 Answer

Will not pass emissions test

the light is an emissions code in there sometimes its a oxygen sensor or the egr valve gets clogged in need to retrieve the code to narrow the problem down

May 11, 2009 | 1998 Honda Civic

1 Answer

1996 Maxima - Emissions (Diagnostic)Testing isn't reading

there is a section inthe manual that tells you how to prepare the car for emissions test which can take less than 2 hrs without driving 400 miles normally if there still a problem the check eng light will come back on shortly after the preperation. if the eng light comes on in acc position on igition switch and goes off the computer is fine.

Jan 06, 2009 | 2002 Nissan Maxima

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