Skip the auto shop - Our mechanics make house calls

Q: Engine light...

asked by on

So my engine light came on 2-3 weeks ago and I took it to a mechanic I had never used before and they checked it and also did a full car inspection, so they did a lot of good amount of work (Oil chance, Air filter change, etc.) Then 5 days after I got it back the engine light came back on and it was leaking gas out of intake valve/gasket and they fixed that, now 5 more days after getting it back again the engine light came back on and I was wondering what might cause that and/or I should still trust that mechanic.

My car has 70000 miles.
My car has an automatic transmission.

A: when your check engine light comes on, it i...

when your check engine light comes on, it is because your car’s controller has detected a malfunction and stored a corresponding trouble code. The technician can read the codes with a scan tool, and take the appropriate action. He then clears the code from the system and the light goes out. Even if the malfunction has not been fixed, the car has to go through two complete "drive cycles" before the light will come back on. A drive cycle begins with a cold start and requires that the car be driven long enough for it to warm up fully before it is complete. That is why, in many cases a technician can fail to repair the problem and the CEL will not return for a couple of days. Sometimes a novice technician might not know how to road test a car and check for "pending" codes to make certain the problem is solved. I can’t give you any advice about the repair without knowing what code(s) the technician found. But I can suggest that you start fresh and contact YourMechanic, who will send a technician to your home or office to read the codes and help you understand what needs to be done.

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: Oil burning, window, and alignment issues

Hi there. Oil consumption can vary and is vehicle specific. If you're having to add a quart of oil every week, this means that there is an oil leak or abnormal oil consumption. The wire in the vehicle's door panel...

Q: Needs to pass smog check..

If the check engine light is only coming on when your on the freeway it might be a problem that the computer is only recognizing at cruising speeds. Your best bet would be to have a certified mechanic read the...

Q: Small fluid leak in front after car is shut off and sits,temperature gauge rising.

You should have the cooling system pressure and leak checked to locate the leak in the cooling system and also check to see why your engine ran hotter than normal. This overheating inspection will locate the leak and then a...

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...
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...
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...