Question about 1998 Mercedes-Benz Mercedes Benz Cl Class

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Check engine light is on after fuel cap was loose. How do you reset the light?

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It is coming, because the fuel tank has more oxygen when you left it open. Take your car to autozone or napa, they can reset the code for you for free. Let me know

Posted on Oct 04, 2009

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1 Answer

Loose fuel cap


Without disconnecting the ECM. Try disconnecting the battery. Both negative and positive for about 30 minutes.

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If you Googled the code, you would find you
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If the gas cap was just loose the light will go out

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The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
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Hi and welcome to FixYa!

As a first course of action, I strongly suggest that you tighten the gas cap. It may be a little loose that's why the engine light is on.

Hope this helps and thank you for using FixYa! Have a good one!

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Most of the time this happens, it is due to a loose fuel cap. The system senses that the tank is not pressurized and send a fault as if th cap is missing. Ensure the cap is on tight and allow for a few days to let the system reset itself. Other that that, most check engine light fault are due to failed or failing components in the Emmissions...these include EGR valves, PVC valve, and O2 sensors. If you are not experiencing less that optimum fuel economy, you may just have a bad seal at the fuel cap. I hope this information helps narrow down the problem.

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1 Answer

2008 Toyota Sienna check engine light is on, diagnostic check reports code PO451. Checked the fuel cap, it is ok, anything else I can do? How can I reset so lights go off?


Hello and happy holidays
Fault code P0451 is a code for the fuel tank evaporative emission control pressure sensor, this sensor is located on the top of the fuel tank, the gas cap is not the problem here, as far as the check engine light goes it will reset by itself if the problem is fixed in 3 drive cycles (about 60 miles of mixed driving), to clear it you either use a scanner or disconnect the battery for 5 minutes, I do not recommend the battery method as it can cause you to loose vital settings in the control modules in the car.

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1 Answer

My check engine light came on. I took it to get testes and it showed the fuel problem. I fill the car with gas and did not shut off the engine.the machanic reset the sensor and the light went off. i drove...


A loose or worn out gas cap can cause the check engine light to activate too.
Don't panic, it sometimes takes several days for the light to shut off, just make sure the cap is tight.

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1 Answer

FUEL CAP LIGHT ON


Hi:
The check fuel cap light is tripped when your cap has been loose or off, and the engine is running. Often you need to have the light reset by a code scanner. If you have checked the cap and it is secure, if you reset the code and it comes back, you possibly need a new gas cap.

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PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.

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Check fuel cap light will not immediatly go out upon replacement of the fuel cap. Might take several days. You could go to a local autoparts store and have them read the trouble code (for check engine light) and reset it. If it was indeed the fuel cap the light should stay off after resetting it. Most autoparts stores do not charge a fee to do this.

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