There are many different reasons for a check engine light to illuminate, and the system that triggers these lights on your dashboard alerts you of minor and major issues.
see Sometimes the system can even incorrectly trigger your check engine light on your diesel truck without anything being wrong. One of the most common reasons for seeing the check engine light on a diesel truck is the aftertreatment system. Diesel trucks have nitrogen oxide NOx sensors that measure what your car is putting out into the environment.
With recent regulations, laws have caused engine manufacturers to add diesel particulate filters DPFs to its aftertreatment standards, which help to further manage exhaust levels. This means even something as small as your diesel exhaust fluids being low could trigger your check engine light. This is a common problem that can be an easy fix.
Without the MAS, a car will struggle at high altitudes where larger volumes of air are required to burn fuel due to lower oxygen density. Please help improve this article by adding citations to reliable sources. Read more about maintaining your car well here Maintenance Tips. These sensors help your car burn fuel cleanly and efficiently, by monitoring the amount of unburned oxygen in its exhaust system. Car Review.
Maybe you left the cap a little loose after filling up, or accidentally rested your gas cap on the roof and drove off. It represented 6. This is the most expensive repair in the top 10 by far.
Drivers are getting the message that a gas cap that is loose, missing or damaged can trigger the check engine warning and allows gas to evaporate. This problem accounted for 4. Use our auto loan payoff calculator to figure out how much you would save by paying more each month and shortening the term of your auto loan.
A malfunctioning mass air flow sensor MAF accounted for 3. Replacing the ignition coil or coils some cars have more than one accounted for 3. Ignition coils can malfunction due to high under-hood temperatures and the overall age.
Pay attention to problems, as ignition coil failures can cause other problems, including with the pricey catalytic converter. Replacing spark plugs and wires now represents 3.
When these items fail, they can cause the engine to misfire and your gas mileage to decline. Replacing the evaporative emissions EVAP purge control valve represents 2.
This valve prevents vapors from the gas tank from being released into the atmosphere and channels them into a charcoal canister to be burned in the engine. Over time, the valve sticks and often needs to be replaced. Replacing the thermostat represents 2.
Replacing the evaporative emissions EVAP purge solenoid represents 2. Like the purge control valve No. It is controlled by the engine control module or powertrain control module and typically needs replacing when it starts to fail and is left partially open.
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