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Why Is My Check Engine Light On? Easy Fix!

hi everybody Paul here so sometimes a

check engine light symbol like the one

here will illuminate on the dashboard of

a person's car and it won't turn off so

since it doesn't tell you anything more

people are left wondering what made it

come on well basically it's telling you

something's wrong with the emission

system which it monitors so let's talk

about the most common reasons why your

check engine light comes on keep in mind

a steady light means it's something

minor and a blinking light means it's

something more serious one big caveat I

also want to mention here is that a lot

of these parts do eventually need to be

replaced because they just get old tired

worn-out however some of these items

will wear off prematurely because of not

performing routine maintenance so here

we go number one is a faulty gas cap

this maintains pressure in the fuel tank

and keeps fumes from being released into

the air the gas cap could simply be

loose damaged or missing number two is a

faulty oxygen sensor this measures the

amount of unburned oxygen in your

exhaust system and controls the air fuel

mixture going to the engine

your vehicle can have more than just one

of these premature failure can be caused

due to your engine burning more oil than

normal or also higher concentrations of

ethanol in your gasoline not replacing

it will cause reduced gas mileage rough

idle and eventually damaging spark plugs

and catalytic converters number three is

a faulty air fuel ratio sensor this

measures the air fuel mixture in the

exhaust manifold and controls the air

fuel mixture going to the engine failure

of this part will cause reduced gas

mileage a drop in engine power output

and delayed response when accelerating

as well as rough idling and even

stalling number four is a faulty mass

airflow sensor this part measures how

much air is coming into the engine and

then determines how much fuel to send to

the engine failure of this part can

cause a reduction in gas mileage engine

hesitation during acceleration harm

oxygen sensors spark plugs and catalytic

converters number five is faulty

ignition coils this part sends

electrical current to the spark plug

premature failure of this part can be

caused by driving in extremely high

temperatures extremely wet weather or

even

driving through a puddle failure of this

park can cause engine misfiring rough

idle or reduction of power and not being

able to start the engine number six is

due to faulty spark plug wires this part

sends electrical current from the

ignition coil to the spark plug

orange spark plug wires will cause

reduced gas mileage loss of power and

acceleration and in severe cases engine

misfiring and stalling it can also cause

damage to oxygen sensors air fuel ratio

sensors ignition coils and catalytic

converters number seven is faulty spark

plugs this part allows the air fuel

mixture to ignite causing engine

combustion worn spark plugs will cause

reduce gas mileage loss of power engine

misfiring and difficulty starting it can

also cause damage to oxygen sensors air

fuel ratio sensors ignition coils and

catalytic converters number eight is a

faulty thermostat this part regulates

the engines temperature a bad water pump

worn or loose water pump belt or

something as simple as a low radiator

coolant level could prevent the

thermostat from operating properly

premature failure can be caused by not

changing the radiator coolant failure of

this part will cause a high temperature

gauge reading and engine overheating

number nine is a faulty EGR valve this

part sends a portion of the exhaust

gasses back to the combustion chamber of

the engine to reduce emissions premature

failure of this part can be caused by

not changing your engine oil regularly

which causes carbon buildup and clogs

the valve the good news is it can often

be fixed just by cleaning it a faulty

EGR valve will result in reduced gas

mileage higher emissions rough idling

engine hesitation reduced overall power

it can even cause serious engine damage

number 10 is a faulty evaporative

emission an aster purge valve or evap

this part prevents fuel vapor in the

fuel tank from being released into the

atmosphere and controls the amount of

fuel vapor released from the charcoal

canister a faulty valve usually means

it's stuck open or the vacuum hoses

attached to it or damaged which can

cause rough idling

heart starting and last number 11 a

faulty catalytic converter this helps

turn harmful carbon monoxide into carbon

dioxide failure of this part is due to

other underlying problems that have not

been fixed the most common being faulty

oxygen sensors mass airflow sensors

spark plugs our spark plug wires of all

the items we've covered this will be the

most expensive to repair if you don't

replace it your vehicle will have

reduced overall engine performance to

include reduce gas mileage reduced

acceleration and power and may run at

higher temperatures it also won't pass

emission tests so if your check engine

light does come on the easiest way to

determine which part needs to be

replaced is to go to an auto parts store

most of them will diagnose the problem

for free with a handheld computer they

can plug into your car which only takes

a couple of minutes most of these parts

aren't that difficult to replace and you

might be able to do the work yourself if

you can't do the work yourself then

you'll need to take it to a mechanic so

I hope this helps somebody out there if

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god bless you too have a great day bye

for now