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1996 Chevrolet pick up -- Service engine soon light stays on. Checked gas cap. It has code # PO140. Any help would be appreciated.

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  • Chevrolet Master
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P0140 is 02 sensor ckt no activity ( bank 1 sensor 2). bank 1 sensor 2 is in back of convertor, it will need replaced it is sending wrong info to pcm.

Posted on Sep 17, 2010

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Service light for gas cap


Hi there:

The gas cap code is a common diagnostic trouble code that might turn on your check engine light. I put together a video discussing a problem my neighbor had with his vehicle after they filled the fuel tank.


You can see the short video and diagram below. But first I wanted to talk a little more about the gas cap code and the possible causes, on some automobiles it is known as the P0440 code.





Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.


Thank you for using FixYa, have a nice day.

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How can I reset the service engine soon light on a 2000 Oldsmobile Intrigue


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The service light is indicating there is a fault code either in the ECM or BCM system. The only way in which this can be switched off is to have these codes checked and cleared in these to control unit with a diagnostic tool.

Mar 21, 2012 | 2000 Oldsmobile Intrigue

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Service engine soon light.


Hi:
There are hundreds of things that trip that light. You need to have your vehicle codes scanned to see what has caused it. Most auto parts stores will do this for free. It could be something as simple as a loose gas cap, but this is an easy way to figure it out!

Apr 13, 2010 | 1997 Chevrolet S-10 Pickup

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1998 Cheverolet Lumina, ''service engine soon'' and hard gear shift


I doubt the two problems are connected. I would try a new gas cap and see what happens since it runs fine. The service engine soon light won't reset on it's own right away.

Jan 11, 2010 | 1998 Chevrolet Lumina

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Service engine light stays on. Adjustment of gas


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The gas cap is usually a good suspect in this case, but to figure it out, you need to have your code scanned to figure out what is causing the light. Most auto parts stores will scan it for free, so give them a shot

Dec 01, 2009 | 2004 Chevrolet TrailBlazer

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1998 sls service engine soon light stays on. autozone said code indicatted gas cap / air in gas should go out on its own but has'nt after 2 fillups


should reset after 100miles but if didnt was code from gas cap left off or is gas cap seal gone bad also the same code is for the evap system check canister and lines for cracks and damage or smell of gas

Sep 29, 2009 | Cadillac Seville Cars & Trucks

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"Service enging soon" light stays on....


This could be a number of things causing this ...most common is that after you fill up the gas cap is not fully tightened...make sure it "clicks" 3 times while turning.The other common problem is that the gasket on the gas cap is old and thus does not seal the tank/fuel filler area...check with replacing the cap.If neither correct then you will need to bring to a service center or dealer to run a code check...maybe a bad O2 sensor or a code for the transmission.

Jul 29, 2009 | 2003 Chevrolet Tracker

1 Answer

2001venture van service engine soon light stays on


most any sensor going bad can cause the check engine light to come on,try disconnecting the posative battery cable for 15 seconds ,then put it back on,will reset the codes, or take it to auto zone,they will test your computer for codes at no charge to you.i had a venture van my was ox. sensor. thanks robert b.

Jun 16, 2009 | 1998 Chevrolet Venture Cargo

3 Answers

Check engine light/gas cap will not stay tight.


Yes, the gas cap will cause the Check Engine Light to come on. Will set code P0441 if I remember correctly. It should be okay to drive it. If you would like to confirm the code, take the truck to an auto parts store like Autozone and have them hook up their scan tool and read the code. If its P0441 it will probably be something like EVAP or Evaporative system leak.

Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.

Dec 31, 2008 | 2005 Chevrolet Colorado

2 Answers

Service Engine Soon


The light is on to alert U to the fact that a fault has occurred in the engine management system(s) or a part of the emission control system, there are over a 100 different problems that turn this light on, take the car to any Kragen auto parts,Auto Zone, Shukes etc and they will test the system for free, it could be as simple as a loose or defective gas cap seal, no way to tell until you give me the trouble codes.

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