How is the Check Engine Light Issue Diagnosed?

How is the Check Engine Light Issue Diagnosed?


The “Check Engine” Light comes as one of the warningsignals that the onboard computing system of your vehicle sends to you, when any of the parts in the engine compartment does not feel right. In usual times, the “Check Engine” light is meant to come on the dashboard with many other indicator lights, when you key the engine and go off with them, once the car gets moving.

But if it comes up in the middle of your journey, and stays back, then it must be treated as a warning sign and must be addressed immediately, advised a senior technician who is in charge of the center for Flagstaff check engine light service.

It is from him that we came to know, that if our car dashboard is displaying the message “check engine” light constantly, and if it is blinking for long, it is indicative of the fact, that some major impairment has taken place in the engine compartment, and that we must ask for professional help, if things do not improve after we try the basic tricks. He also took pleasure in showing us how at an auto repair shop, the “check engine” light issue is diagnosed and resolved.

Checking Out the Gas Cap:

The first thing that is checked when the “check engine” light turns on is the gas cap. The gas cap is the seal that protects the fuel reservoir and is responsible for maintaining the optimum level of pressure in the fuel tank. Sometimes, the fuel cap might crack up just because of the salt deposits or canbecome loose and fall off from its slot. Since with no cap to protect the reservoir, the fuel is most likely to spill off into the compartment, the onboard computer system detects this issue and sends message to the car user by turning on the “check engine” light.

If that is the sole reason behind the turning on of the “check engine” light, then the mechanics will address the issue, wither by tightening back the gas cap, or by replacing it, in case it has broken down.

Checking Out the Oxygen Sensor:

Sometimes it is because of the faulty oxygen sensor that causes the “check engine” light to turn on. The oxygen sensor is that part which monitors the exhaust system checking out the amount of unburned oxygen. It plays an important role of indicating the fuel efficiency of the engine and also checks for the air-to-fuel ratio. When this oxygen sensor gets out of order, it fails to provide the correct data to the onboard computer. The latter detects the fault and sends the intimidation to the car user through the “check engine” light.

If the mechanics find this to be one of the causes behind the “check engine” light, they will replace it immediately to resolve the issue.

Damaged Catalytic Converter:

At the unit of CEL testing & diagnosis in Flagstaff we were shown how a damaged catalytic converter can cause this light to get turned on. To know if it is the major reason behind the “check engine” light issue, the mechanics will check this part through their scanner and replace itimmediately.

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