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?

A: Hello. If there is a misfire in multiple cy...

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Starts then stalls.

Hi there. Check the fuel pump relay and see if its working. If the fuel pump relay is getting hot, it will cut off and causing the fuel pump to shut off when the engine is running. This will cause...

Q: When vehilcle gets to 60mph or more it sputters / (small backfires) in the exhaust along with increased valve clatter, heating up.

It sounds like the engine is getting starved for fuel above 60 mph. I would first try and test for any codes in computer and then if no codes then check fuel pressure to see if it is normal. If...

Q: purchased isspro R8480M speedometer, and have to replace new one with old one in vehicle, must match mileage to the mile. but no p

Hello. I would contact the manufacturer of the gauge for specifics on whether or not the mileage on the unit can be advanced. It may be possible that mileage can be advanced electronically or mechanically by disassembling the unit. However,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...