Skip the auto shop - Our mechanics make house calls

Q: Why is the check engine light always on?

asked by on

The Check Engine light in my 2006 Toyota Corolla (87k miles) always seems to be on for one reason or another. I had it serviced the first few times but now it just comes on with no difference in performance and no other warning lights. I am worried that if the light just stays on all the time for no reason then when something really does go wrong I won’t have any way to know. If there an easy way to find out why the light is always on without getting it serviced weekly?

A: You are correct that when the Check Engine ...

You are correct that when the Check Engine light is illuminated with no drive symptoms you will not have any indicator if any more problems are happening. That is, unless another light comes on or you get symptoms you did not have before. I would first recommend you contact YourMechanic to have the Check Engine light diagnosed and resolve any issues the mechanic determines as a cause for the light to be on. If a code P0456 is present then Technical Service Bulletin(TSB) 0235 09 may be the cause. This TSB is an update to an earlier fix for your vehicle that you may have had done. This is a replacement or recalibration of the engine control module. A thorough diagnosis by YourMechanic can steer you in the right direction to fixing your vehicle so you won’t have to get it serviced weekly anymore.

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・Save up to 30%

Get a quote

What others are asking

Q: Lights melted the headlights

Hello! Thank you for writing in about this problem. This issue is common in 2005-2011 Tacoma models. Toyota recently released Technical Service Bulletin (TSB) TC-14-025 that specifically covers this problem. An extended warranty has been placed on the headlamp assemblies...

Q: How much should it cost to replace a fuel pump relay?

A fuel pump relay will typically cost about $25 for the part, and a mechanic may charge a minimum of an hour's worth of labor to replace it. The vehicle not starting may be a fuel pump or relay along...

Q: What does the maintenance required Warning Light mean?

The maintenance required Warning Light is located on the instrument panel. When this light illuminates, then the vehicle is due for schedule maintenance based on the miles that have been driven since the last maintenance. Tip Like all warning lights,...

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...
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...
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...