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Q: Replaced gas cap and cleared p0420 code?
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How do you fix a P0420 code for a Cadillac Seville?

it cant be fixed just tightend your gas cap harder


What is code P0420 on a 1998 Toyota Corolla?

P0420 Is an evaporative emissions system leak code. This code is most often caused by a bad or loose fuel cap. It is also often caused by people refueling their vehicles with the engine running. It can also be caused by a leak in the system that has nothing to do with the fuel cap or refueling.


Why doesn't the Check Engine light go off after I replaced the gas cap on a2008 Toyota Tacoma?

How do you know the gas cap is responsible for the Check Engine light? The computer will have to be cleared by a repair shop with a scanner.


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How do you know if your gas cap is bad?

Your check engine light will come on and the computer will give you an emissions code reading. I have had 2 cars show this code and it went away after I replaced the gas cap. Hope this helps.


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Have a 1999 Honda CRV with an engine code of 1399 and have just replaced all the ignition-related parts timing belt plug wires rotor cap plugs and now get this code Can it be valve timing?

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