Why is Engine Light On in Phoenix, AZ?

Why is the engine light on in Phoenix, AZ? What does it mean?  The necessary engine repair may be major or minor, but it’s vital to get the vehicle checked right away. In our hot temperatures, things can go from bad to worse very quickly. Here’s what you should know.

The malfunction indicator lamp is part of the onboard diagnostic system.  Computers are regularly controlling and monitoring everything from ignition timing to the fuel mixture.  Computers regulate engine speed and automatic transmission shifting. 

An illuminated engine light means that the computer has found something seriously wrong.  This is a good thing, although it may not seem like it.  The problem may be that a sensor has gone out.  Your mechanic replaces the sensor and everything is working again.  On the other hand, if the owner does nothing, then the broken sensor leads to more broken parts. This may result in the need for a major engine repair. 

What does a flashing engine light mean?
Flashing represents a more immediate problem.  A misfire can overheat the catalytic converter.  A faulty internal part can lead to a fire due to high engine temperatures.  Your onboard computers are warning you that things are getting worse.  Phoenix AZ temperatures won’t help the matter.  

Ten Reasons Why the Engine Light is On -- 

  1. Spark plug wires
  2. Spark plugs
  3. Ignition coil
  4. Oxygen sensors
  5. Mass airflow sensor
  6. Broken Thermostat
  7. Exhaust gas recirculation valve
  8. Evaporative emissions purge solenoid
  9. Fuel Injectors 
  10. Catalytic converter

Engine Light Average Cost of Repair

Consumers can expect to pay from $100 to $500 for timely repairs of sensors and most parts.  Large parts such as fuel injectors may cost more.  The catalytic converter replacement can push into the $1,000-plus range. That’s why it is vital to fix the small stuff before it affects more expensive parts. 


Phoenix AZ Engine Light Dos and Don’ts

  1. Do check the gas cap. Occasionally, a loose cap is the culprit.  If the light doesn’t turn itself off, you need to get a diagnosis.
  2. Do not have the code diagnosed unless you are ready to make repairs. You can do this at an auto parts store, but it will waste your money. They can’t fix it.
  3. Do not have the engine light turned off at an auto parts store. 
  4. Do consult a certified mechanic for an accurate code reading and skilled diagnosis. The code itself is not a diagnosis. It only points toward the problem.
  5. Do not wait for the engine light to come on if you sense that something is wrong. Engine lights don’t cover all aspects of the vehicle’s operation.