Why is Check Engine Light-Activated in Your BMW?
The first sign of an engine problem is when the check engine light activates on your BMW dash.
Many things can cause this light to come on; there's no single simple explanation.
You will need to pull the BMW engine's error code with a code reader.
This coded feedback tells you the problem and its origin and allows you to diagnose proper repair.
Here are the common reasons for which the check engine light is activated.
Catalytic converter
To reduce the environmental impact of exhaust, your BMW uses a catalytic converter.
It transform carbon monoxide to carbon dioxide and hydrocarbons into carbon dioxide and water.
When catalytic converters fail, you will need to replace them and if you don't, your engine will stall.
Exhaust gas recirculation valve
The exhaust gas recirculation (EGR) valve sends unburned fuel back to the engine.
Your BMW efficiently uses fuel and reduces its output of dangerous hydrocarbons from unused gas.
A knocking sound, a check engine light and rough idling indicate a clogged EGR valve.
Spark plugs
Spark plugs create the spark that ignites the gasoline in each cylinder.
Your engine won't operate with a bad spark plug, causing a drop in performance.
Rough running and idle as well as poor acceleration are also side effects of fouled spark plugs.
Mass airflow sensor
The task of balancing the amount of air going to the engine comes from the mass airflow sensor.
With too much air, your engine could burn lean, not using enough fuel and running poorly.
A bad mass airflow sensor will cause the problem of too much fuel.
Loose gas cap
A loose gas cap will cause this light to activate on some BMW models.
Tighten the cap according to your vehicle's owner's manual to see if that solves the problem.
Proper fuel system pressurization is required to avoid such warning signs.
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