Question about 2001 Chevrolet Blazer

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Engine light is on after getting checked at autozone says evaperation sensor. i made sure the gas cap is tight but the engine light is still on

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There are 5 o2 sensors in the system, 2 are fuel ratio sensors i would think one of the 2 might be the problem. If its a vacume system leek and not a bad sensor its your best option is to find a mechanic with the proper vacume test equipment to test the system. Good luck

Posted on Feb 16, 2012

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Posted on Jan 02, 2017

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SOURCE: Check engine light/gas cap will not stay tight.

yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.

Posted on Apr 24, 2009

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SOURCE: '07 Tahoe; check engine light on steady. Just came

Have a dealer or garage check your Oxygen (O2) sensor. As a quick fix, try disconnecting and reconnecting your car battery. Sometimes this will reset the check engine light.Good Luck!

Posted on Aug 01, 2009

canbruce75
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SOURCE: I am getting a tighten gas cap message, however

The gas cap is most likely faulty. The gas cap is an integral part of the evaporative emission system. If it is not sealing or venting properly, it can affect the proper operation of this system. I would replace the gas cap and have the check engine light reset at an autoparts store. Most stores will scan/reset computer for free. Hope this helped and best wishes.

Posted on Aug 07, 2009

  • 59 Answers

SOURCE: check engine light on says check gas cap

The evaporative emissions system uses a vaccuum pump to check the fuel system to make sure that fuel vapors cannot escape into the atmosphere. If you leave fuel cap loose the computer will detect it and set a computer code and turn on the check engine light. If the cap is tight and the light still comes on, you may have other problems. Hopefully your vehicle is still under warranty, as evaporative emission system leaks can be very difficult to locate and repair, even for the dealership mechanics.

Posted on Aug 28, 2009

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SOURCE: 06 chevy impala v6 3.9 liter engine. Check engine

there is a large evaporative leak. keep away form ottozoo, they dont have the brain power to actually diagnose a light bulb., their job is to sell parts., if they sell you the wrong parts tough.Take it to a qualified repair shop that does a lot of GM work or the dealer.

Posted on Sep 25, 2009

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1 Answer

Engine light staying on


The engine light comes on from some kind of problem with the engine. It could be a sensor of any kind. The best thing to do is go to a place like AutoZone and have them scan it and find out what is going on. One thing you could check is the gas cap, if she put gas in it and didn't get the cap on tight it could set a code and turn on the light. If you get the cap on right the light should eventually go out. Please rate my answer so I get the points for answering your question.

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2004 Buick Raineer check engine light on; gas cap new and tight.


Hi!!

Check engine light comes on when the computer detects a malfunction in the emision control system, could be a loose or broken vacumm line, loose gas cap or a sensor.

Drive your vehicle to an AutoZone store, ask them to retreive the trouble codes from your computer memory, they will do that and a print out of the codes and their meaning. This a free service they provide for their customers.

Don't forget to rate this answer. Good Luck

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Lincoln 2005 Navigator. What should I do for my Engine light being on?


go to autozone and get the code for free, then come back and tell us. Or go get the car diagnosed.
Or make sure your gas cap is on tight. A loose cap sinks wallets. If its a gas cap issue it may take a day for the light to go off on its own.

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P0420=Catalyst System Efficiency Below Threshold Bank 1,
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Why check engine light come on mostly after refuiling after a long drive ?


Because your vehicle is a 2008 I feel it shouldn't be anything to pressing but still take some precautions.

What alot of people don't know is sometimes if the gas cap is not put on tight enough a little air might get in or your gas pump might have to work a little harder because it can't get full vacuum pressure with the cap slightly open. these are not major issues.

these are reasons why your check engine light comes on. It happened to my 2005 Buick Rendezvou We had the check engine light on for a week. The car never shuttered, stalled, delayed starts it ran perfectly fine. I took it in to check engine light their computer showed that it was the EVAP system which is the heating and cooling system I would have to get it checked for leaks or do a static check for leaks.

This didn't look good but then one day I had done some work for a friend told him of my problem he told me it could be my gas cap. The next day I asked my wife if the gas cap was working on vehicle it actually was broke I replaced gas cap and the check engine light came off.

Now with this story (which is true) don't assume every problem could be this. But if you are not noticing any stalls, delayed starts, shuttering anything out of the ordinary check the cap at times to make sure it is closed.

If you keep on having light on and replaced cap or made sure was securely on then take and get it checked out.

merry christmas

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1 Answer

The orange light picture of an engine came on today why is this?


check engine light....autozone or advanced auto will check that for free....make sure your gas cap is always tight after refueling....turn off engine before refueling....disconnect poss. post on battery and it should go away..then reconnect

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go to advance or autozone, and let them pull the codes and tell you what you need done.

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Check engine light went on


Some auto parts stores (like AutoZone) will diagnose the code for the check engine light for free. If the vehicle is running fine it may be something as simple as a bad oxygen sensor.

Jul 13, 2009 | 2003 Toyota Avalon

1 Answer

Service engine light is on code 0421


Your number 1 O2 sensor is bad replace it. this is the O2 sensor attached to your headers. Could be faulty sensor or the air/fuel ratio is offset. But replace the sensor its not running effeciently.

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