Q: Check engine light illuminated all the time. 2000 Mazda B4000

asked by on

Recently, the dashboard in my truck has started showing the check engine light illuminated and it doesn't turn off. I've had several repairs done, which include MAF sensor and oxygen sensors replacement, along with the gas cap change. The check engine light is still illuminated. Also, I've been getting a very low gas mileage. What might be causing the CEL to be on all the time and is there a way I could improve gas mileage?

Hello. If there is a misfire in multiple cylinders of the engine, this will cause the Check Engine Light to come on. However, there are a lot of other reasons that the Check Engine Light could be on. It is important to retrieve the codes that have been stored by the PCM to properly diagnose the problem instead of blindly throwing new parts on. If the spark plugs are faulty, changing them may increase gas mileage. Using a premium gas can increase gas mileage as well. Have a certified technician, like one from YourMechanic, come and complete an inspection to determine why your Check Engine Light is on and help restore performance on the car.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check engine light illuminated all the time. 2000 Mazda B4000

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Advise on what to use for automatic transmission fluid

Automatic Transmission Fluid (ATF) can be petroleum-based, partially synthetic, or totally synthetic-based oil. All domestic automobile manufacturers require a petroleum-based fluid in their automatic transmissions. Some import manufacturers require the use of a partially synthetic fluid. ATF is a petroleum-based...

Q: The engine light is on and displaying a P1101 code on my code reader.

Hi and thanks for contacting Your Mechanic. The code P1101 means that the mass airflow sensor (MAF) is out of self-test range. Check to see if the clamps to the sensor are tight. A slight leak of air around the...

Q: Q: Car gets very low gas mileage

I would do a little quick research and find out what is typical real-world MPG for others who drive your make and model. That will provide you a realistic base-line expectation that will be more accurate that Mazda or EPA...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.