Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Engine misfires and hesitates while accelerating

If the issues only began to occur after the vehicle was fitted with a new MAF and different intake, then it may be possible that the issue is related to the recent work. The mass airflow sensor is one of...

Q: Very low fuel efficiency

Your mileage is low compared to the EPA rating. Your vehicle was sold with a 3 yr/36,000 mi basic, 5 yr/60,000 mi powertrain warranty. In the event that there is an engine or transmission problem that accounts for the low...

Q: Car cuts off when put in drive, doesn't go backward - 2007 Chrysler Pacifica

Hello. A common fault with your vehicle is the torque converter clutch not releasing properly. This causes stalling when shifting to Drive or Reverse. If you need someone to come to your car, a mobile expert from YourMechanic can come...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...