Skip the auto shop - Our mechanics make house calls

Q: Engine light showing on a 2011 Toyota Corolla

asked by on

I have a 2011 Toyota Corolla. It shows the engine light on. I took it to a friend with a code reader and it said it's an emissions leak somewhere in the system. Is this an expensive leak to fix?

A: It could be. I would put a gas cap scan on ...

It could be. I would put a gas cap scan on it first, that’s often the easiest fix. If the gas cap is worn and it leaks, it’s going to trip that code. If it’s not that, the problem is what’s called the EVAP system, and you have a minor EVAP leak.

EVAP systems go from the gas tank and all the way around, under the car, in front of the engine. It’s very complicated to check. It requires a dealer-level scan tool, the open-and-closed valve, and a smoke machine to check for leaks. It can be a real stinker.

But on the plus side, on a Toyota, they will run perfectly fine. I had a customer that had that. He drove his car for five years that way and then, for some inexplicable reason, at the end of the five years--it stopped tripping the code and the light didn’t come out anymore. So, it doesn’t really mean all that much if the car runs fine. You could get a second opinion from a certified technician if you are not sure. A mechanic from YourMechanic can come to your home or office to diagnose your Check Engine Light and detect any leaks if they are present.

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: Some lights don't work - 2011 Mitsubishi Outlander Sport

Hello. Using a VOM check for voltage at the bulb receptacle. You will probably find that the circuit is "dead" at that point. You then have to trace the circuit to find out where it is open. You might have...

Q: I have a diagnostic trouble code P147d.

The code P147d is coming up for the fuel canister purge valve that could be sticking and not working properly. The purge valve is designed to control the emission's vapors in the fuel system. If the valve is not functioning...

Q: Car making loud noise and barely running.

This sounds like it could be a serious problem for your car. My first recommendation would be to have this vehicle inspected by a certified mechanic as soon as possible to avoid these symptoms turning into larger problems. The list...

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...
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.