Q: Check Engine light on

asked by on February 25, 2016

The Check Engine light is coming on.

The powertrain control module (PCM) takes inputs from dozens of sensors. It then uses this information to control outputs such as fuel delivery and emissions equipment. If the PCM detects a problem anywhere in the system it will illuminate the Check Engine Light. There are literally hundreds of potential causes for the light being on. A trained professional will be able to retrieve the corresponding diagnostic trouble codes to analyze your vehicle and make the repairs that will clear the Check Engine Light.

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

Car overheating and there is no cabin heat while at idle.

Hi there. Check the radiator to the vehicle. It seems that the cooling system is working, but the radiator is restricting the coolant flow. This is why when you step on the gas pedal the coolant temperature drops. I recommend...

Trouble running when the engine warms up, dash lights on - 2007 Subaru B9 Tribeca

The P0137/P0157 codes indicate the "rear" (behind the catalytic converters) oxygen sensors are not functioning properly. In turn, they are signaling (incorrectly) for more fuel, which is causing the P0172/P0175 over-rich codes. This is clogging your converters, as well as...

how much would a average tune up b for my Mercedes c280 2000

Hi there: A typical "tune-up" on a modern car is not as common as they used to be. In fact, due to the multiple electrical sensors and computer controlled components on most of today's Mercedes-Benz, symptoms like you're describing are...

Related articles

P0474 OBD-II Trouble Code: Exhaust Pressure Sensor Intermittent
P0474 means there is an abnormal voltage reading caused by the exhaust back pressure regulator or a clogged back tube.
What Does It Mean When the Dashboard Warning Lights Blink?
A blinking car warning light can indicate different problems with your car. If your Check Engine Light flashes without stopping, get it checked out.
The Best Used Cars to Buy If You Live in a Cold Climate
If If you live in a cold climate, likely one of your biggest concerns when you are considering which used vehicle you should buy is how well it will perform in snowy, icy conditions. We have evaluated a number...