Q: 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?

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Why is the check engine light always on?

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: does flushing your coolant system fix mixed fluid buildup?

Hi there. You may have to flush the engine a few times and then run fresh water a couple times until system is clean. Then refill it with the proper coolant and distilled water in a 50/50 mixture. If you...

Q: Front passenger seat won't move backward

Hi. If it moves forward, but not backwards, it is most likely the switch. A few simple checks with a test light can determine what it needs. Make sure there isn’t anything in the track preventing the movement. I’ve seen...

Q: My car shifts gears but doesn't move

The vehicle not moving in any gear for a manual transmission is going to most likely be a clutch is not engaging from a worn out clutch disc. You will need to have the transmission removed and new clutch kit...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...