Skip the auto shop - Our mechanics make house calls

Q: Check Engine Light on - 2007 Mazda CX-7

asked by on

The check engine light is on. This remains on for couple of days and again without doing any rectification job the light automatically goes off. The light does not remain again for couple of days. Again it comes on. Usually the light goes off during starting the car. But the light always comes on when the car is running.

My car has 155920 miles.
My car has an automatic transmission.

A: Hi there. When the Check Engine Light comes...

Hi there. When the Check Engine Light comes on, it will store a trouble/fault code in the engine control unit. It will remain on as long as the ECU continues to see the fault that turns it on. If it goes off by itself, then comes back on a few days later then you have an intermittent fault. The best way to find the cause while the Check Engine Light is on is to have a certified technician perform a diagnosis of any existing trouble codes that are being read with the light. That way, the fault present in the system can direct the mechanic towards the problem and the technician can find the root cause.

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: car sat for 14 days and now won't start even after turning it off after jumping it.

From what you've described, it sounds like your battery is not capable to hold a charge anymore for long periods of time. I suggest having the battery and charging system checked. Have a certified technician, like one from YourMechanic, diagnose...

Q: Car shaking and misfiring

Hi. The first thing to do is check the codes stored in the engine computer. If the engine is indeed misfiring, codes will be stored. The source of the misfire will need to be identified, possible faults include a failing...

Q: At light on and car stalling

The AT Light is indicating a fault with your transmission. The transmission in your particular vehicle has its own computer that can self diagnose issues it may be having. A qualified technician, like one from YourMechanic, could retrieve any stored...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.