Why did my check engine light just pop on?

There are countless reasons why the check engine light might pop on. For instance, a faulty gas cap, which would allow fuel vapors to escape into the atmosphere, can trigger the light. Likewise, an internal engine problem that causes a misfire, and therefore increased hydrocarbon emissions, can also turn on the light.

When engine light comes on and off?

Worn-out spark plugs can affect your engine’s combustion process and throw it all out of whack. It can also lead to a check engine light on and off intermittently. The thing about bad spark plugs is that, initially at least, you’re going to be able to continue to drive around with them.

When does the Check Engine light come on?

Check engine light came on, stayed 2-3 days, then went of… Q: Check engine light came on, stayed 2-3 days, then went off. My check engine light came on out of the blue one day (12/14) I had my mechanic look at it immediately (the same day). He informed me that my thermostat was not keeping the engine at the desired temperature.

What to do if your engine management light comes back on?

If the light returns, then you probably have an issue that requires the attention of a mechanic. Alternatively, your local garage will be able to reset your engine management light. An even simpler way to clear the engine management light is to turn the ignition on and off.

What should I do if my Mini Cooper check engine light keeps coming on?

When you bring it back to the dealer, print out the answers to your question, tell them that this issue has been present and that none of the Mini mechanics know what to do about it. The letter to the dealer should show that this happened during the warranty period. You want it fixed now, at no cost.

Why is the engine light on on my car?

It is quite likely that the fault has been present on the car previously, only to be deleted by the selling garage (or whoever in the trade they bought it off) in the hope that it won’t come back on. Which says large amounts for their ‘quality checks’, or rather the complete lack of any such checks.

Check engine light came on, stayed 2-3 days, then went of… Q: Check engine light came on, stayed 2-3 days, then went off. My check engine light came on out of the blue one day (12/14) I had my mechanic look at it immediately (the same day). He informed me that my thermostat was not keeping the engine at the desired temperature.

It is quite likely that the fault has been present on the car previously, only to be deleted by the selling garage (or whoever in the trade they bought it off) in the hope that it won’t come back on. Which says large amounts for their ‘quality checks’, or rather the complete lack of any such checks.

Why is the Check Engine light on on my Jetta?

The system had detected the imminent failure of the bulb and was warning you. On my Jetta, what sometimes happens is that you’ll get a check engine light if you forget to put the gas cap back on, or don’t put it on tight enough, before you start the engine.

Why is the Check Engine light on on my Echo?

It’s usually something related to the emissions, like everyone else in the thread has said. Sometimes a loose gas cap will cause a drop in pressure in the fuel tank and that will set the CEL. My Echo has been doing that after nearly every fill up the last couple of months.