Something none of us likes to see is the “Check Engine” light
illuminating our dashboard. After the initial horror and disbelief, our
thoughts turn to hoping it is not a major issue. The worst thing we
can do is avoid seeing a mechanic immediately – some issues just get
worse if left unchecked. So, what is that little light telling you? Here
are the eight issues it could be signaling you to address:
1. Oxygen sensor failing
Oxygen sensors keep engines performing at
peak efficiency levels, and they manage emissions. O2 sensors monitor
gasses leaving the engine. Engines need exact ratios of fuel and air for
the most efficient operation. Malfunctions can drop your fuel economy
by up to 40 percent. Engine performance is also negatively affected.
2. Ignition coil problems
Ignition
coils take electric current from the battery and ignite the spark
plugs. Without properly functioning coils and spark plugs, the electric
current powering your car's engine are disrupted. All the parts in the
car's electrical system take a lot of wear and tear from the electricity
passing through them.
3. Spark plugs and spark plug wires
Along
with the ignition coils, spark plugs and wires are critical components
of the vehicle electrical system. Symptoms of problems with plugs and
wires include rough engine idling, engine misses or pings, erratic
engine power including power losses and power surges. When engines
misfire, fuel economy drops. Ignoring spark plug and plug wire problems
can permanently damage the car's catalytic converter, leading to very
expensive repairs.
4. Mass airflow sensor malfunctions
The
mass airflow sensor, or MAF, measures the air coming into the engine and
calculating how much fuel to add to the mix. This data goes to the
Engine Control Unit (ECU). Without correct information from the MAF, the
ECU cannot correctly balance or deliver the right amount of fuel to
your engine. The result is very poor engine performance and 10 to 25
percent decreases in fuel efficiency. Replace this critical component
immediately if it begins to fail.
5. Faulty vacuum hose or evaporative emission control system
The
evaporative emission control system (EVAP) of a car keeps gasoline
vapors from the fuel system and gas tank from release into the air.
Leaking vacuum hoses and vents, defective valves and faulty gas caps all
contribute to EVAP system problems.
6. Exhaust gas recirculation valve and ports are dirty
The
exhaust gas recirculation system (EGR) controls your car's emissions
and helps cars run more efficiently. Rough idling, engine hesitation and
misfires can indicate an EGR problem. Worsening performance and fuel
economy often result from EGR problems. Often the components of the EGR
system are dirty or clogged.
7. Catalytic converter failures
Catalytic
converters are often the most expensive mechanical repairs made to
vehicles. As a part of the exhaust system, it converts dangerous
chemicals in car exhaust into less harmful compounds to release into the
air. Catalytic converters should last for the lifetime of the car. Most
problems with catalytic converters come from underlying problems such
as those that occur with bad spark plugs or ignition coil problems.
8. Dead battery and charging system problems
Most
cars have computer systems that monitor voltage in the electrical and
battery systems. The computers activate the check engine light when
anything appears amiss in the charging system of the car. High
temperatures in the engine compartment contribute to rapid aging of
batteries.
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