Q: My check engine light comes on then leaves randomly

asked by on August 13, 2017

The check engine light comes on then leaves randomly. Sometimes it takes just a few hours and sometimes a day. I get the same codes for the MAP sensor (changed it twice) and the fuel tank pressure sensor. The car does not buck anymore nor does it behave abnormally. The only thing that bothers me is the throttle being tweaked to prevent too-low idling. This causes the car to move more without using the pedal (i.e letting the car move by itself now makes it hit 7 MPH quickly from a complete stop, which was not how it was before).

My car has 146000 miles.
My car has an automatic transmission.

Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or spark plug wires and many other reasons. Due to the wide range of possibilities for the check engine light to come on, the best and most efficient way to narrow down the scope of what may be causing this is to have the vehicle hooked up to a scanning tool to download any potential fault codes that may have registered in the computer. This will allow a mechanic to determine more specifically what to look for in diagnosing your vehicle. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to determine what may be causing your check engine light to come on.

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

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

I have a 2001 honda cr-v se 2 Li I4 engine. on the back of the throttle body is a im guessing it's some type of sensor,two mires p

You are correct. This is the throttle position sensor or TPS. You should not need any special tools to remove it. Most throttle position sensors are mounted to the throttle body with 7mm, 8mm, or tor bolts. If you have...

Can I go to a trip through the state with the following problems with my car?

You should ask the shop that gave you the estimate since they quoted you to replace the transaxle. The transaxle problem may be something that could leave you stranded and cost thousands of dollars to replace this part. The car...

Why would there be smoke coming from under my hood and now my car does not shift 2001 Honda Civic

Hi there. It seems that the transmission fluid is leaking. Check the cooler hoses from the transmission to the radiator on the car and see if they are leaking. A leak on the transmission will cause the vehicle to not...

Related articles

The Top 5 Selling Cars in Georgia in 2012
Georgia Georgia offers drivers a mild climate with very little snow, but rain is a major factor. Previous best-selling cars in the area, such as the Escape, Fusion and Camry, have shown that residents prefer a mix of both SUV...
The Best Used Cars to Buy If You’re Single
When When you’re buying a vehicle that needs to meet the requirements of all kinds of passengers the process can prove to be rather tricky. However, if you happen to be single, you’re the one in control, and your list...
The Top 5 Selling Cars in Delaware in 2012
Delaware Delaware offers a variety of weather, which means drivers have to be prepared for both the mild and the treacherous. In previous years, the best-selling vehicles have included the Honda Civic, Accord and CR-V, along with the Toyota Camry....