Question about 2004 Isuzu Ascender

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Check engine light on got new gas cap reset light 1 hour light is back on

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Run fault codes as it is probably something else besides the cap.

Posted on Nov 29, 2013

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1 Answer

Check engine light is on duee to gas cap got new gas cap how do I reset


Remove the negative battery cable for 5 minutes or so and it should clear it.

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Go to the parts store where you bought the cap. Sometimes the code clears on it's own and sometimes you need to have it reset. If this is not an option disconnect the negative battery cable for a minute. Just as a warning, if you disconnect the battery you will have to reprogram most all of your electronics.

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Service engine soon light came on, I took it to get it checked out, they said it was the gas cap not sealing properly, got a new gas cap, the light went out, it has only been a few hours, it is on aga


there is, unhook the battery let the car set for an hour and re hook it. but i can tell you it will come back on. the reason they told you it was a gas cap is the code told them it was an evap/purge system problem. this is very commonly the gas cap. but in your case it might not be as the light came back on.

Feb 12, 2012 | 2001 Buick LeSabre

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Mar 08, 2010 | 2003 Chrysler Town & Country

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if its code p0442 the most common problem is gas cap unless they reset the code for u the vehicle has to cycle- start up a few times or reset after certain amount of miles are driven--but-- this code also can b a cracked, broken,or disconnected vent line,go back to auto zone have them rescan and check for code and have them reset the trouble code if it comes back on than a problem still is present

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By "Replace the gas cap", do you mean put it back on, or buy another one? If you fuel these trucks with the engine running, or don't tighten the gas cap, the light will come on. It will also come on when the seal in your gas cap goes bad. I have had to replace the gas cap on my jeep and dodge already. It fixed the problem both times.

Jul 07, 2009 | 2007 Dodge Ram 1500 Quad Cab Sport

1 Answer

2006 pt cruiser, check engine light came on. Shortly after, gas cap light. Replaced gas cap and reset. Today bith lights came on again.


are you fueling car with key "on"? That will cause light to come on. Disconnect battery for 1 hour and this will reset "keep alive memory" and clear codes from memory. Drive car for 10 miles so computer can relearn engine parameters. It may run rough during this period.

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2 Answers

Check engine light keeps coming on replaced gas cap already


Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:

1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engine Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.

Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 18, 2009 | 2003 Dodge Caravan

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