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My service engine light comes on and off. I replaced the gas cap and so far it has not worked.

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  • asuntos27 Sep 20, 2008

    Hi, I had this same problem and a friend of mine who has a Leganza had the same problem, too. There is a gasket on the engine block, under the cover of the engine which is worn out. Look and see if you don't see a little oil seeping out or build up around the engine block right under the black plastic cover. It cost me about $90 to fix, and the light has never come back on again. And, I had drove the car this way for 2 years because no one could figure out what the problem was.

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  • 3 Answers

Unplug you batt of the can for 30 or 60 sic

Posted on Aug 25, 2008

5 Suggested Answers

bunnydawg
  • 5158 Answers

SOURCE: Service engine light comes on, replaced gas cap,

usually you need to unhook the battery for about ten or 15 minutes. if it's an antitheft radio make sure you know the code and how to enter it. also it won't reset if replacing the gas cap didn't fix the issue.

Posted on Jun 09, 2009

  • 7353 Answers

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

  • 67 Answers

SOURCE: code displays po440 ;i've replaced evap cannister

your local dealer can perform a smoke test to test your evap system for leaks

Posted on Nov 12, 2009

  • 1752 Answers

SOURCE: service engine soon light came on. AutoZone read

Sometimes you have to wait a week for the light to go off, the computer has to go through several start/run/stop cycles.

Posted on Nov 22, 2009

Onifade
  • 268 Answers

SOURCE: Three problems so far. Check engine light stays

You might try removing the battery connectors for five minutes and replacing back.

If the codes do not disappear, please you might have to get a scanner to do that.

Cheers.

Posted on Dec 15, 2009

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2 Answers

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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