Check Engine Light


Lawless Chrysler Dodge Jeep Ram

What Is The Check Engine Light?

The Engine Check/Malfunction Indicator Light (MIL) is a part of an Onboard Diagnostic System called OBD II that monitors engine and automatic transmission control systems. The light will illuminate when the ignition is in the ON position before engine start. If the bulb does not come on when turning the key from OFF to ON/RUN, have the condition checked promptly.

Certain conditions, such as a loose or missing gas cap, poor quality fuel, etc., may illuminate the light after engine start. The vehicle should be serviced if the light stays on through several typical driving styles. In most situations, the vehicle will drive normally and will not require towing.

When the engine is running, the MIL may flash to alert serious conditions that could lead to immediate loss of power or severe catalytic converter damage. The vehicle should be serviced as soon as possible if this occurs.

Should I Be Concerned?

Prolonged driving with the Malfunction Indicator Light (MIL) on could cause damage to the engine control system. It also could affect fuel economy and driveability. If the MIL is flashing, severe catalytic converter damage and power loss will soon occur. Immediate service is required. A malfunctioning catalytic converter, can reach higher temperatures than in normal operating conditions. This can cause a fire if you drive slowly or park over flammable substances such as dry plants, wood, cardboard, etc. This could result in death or serious injury to the driver, occupants or others.

What Is OBD II?

Your vehicle is equipped with a sophisticated onboard diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transmission control systems. When these systems are operating properly, your vehicle will provide excellent performance and fuel economy, as well as engine emissions well within current government regulations.

If any of these systems require service, the OBD II system will turn on the “Malfunction Indicator Light” (MIL). It will also store diagnostic codes and other information to assist your service technician in making repairs. Although your vehicle will usually be drivable and not need towing, see your authorized dealer for service as soon as possible. ONLY an authorized service technician should connect equipment to the OBD II connection port in order to diagnose or service your vehicle. If unauthorized equipment is connected to the OBD II connection port, such as a driver-behavior tracking device, it may be possible that vehicle systems, including safety related systems, could be impaired or a loss of vehicle control could occur that may result in an accident involving serious injury or death. Also it could allow others access to information stored in your vehicle systems, including personal information.


Common OBD II Codes!

There are many OBD II codes that your vehicle might give you but some of the most common are P0300, P0420, P0171, P0455, P0301, P0456, P0303, P0304, P0302, and P0442.

Schedule Your Check Engine Diagnosis!

When you are ready for a Diagnosis of the Check Engine light, we offer to work around your schedule to get you back on the road as fast as possible. Find out how you can contact us below.


How to Contact Lawless Service


Call 781-531-8883 to speak to a Service Specialist now.


Simply walk into our dealership and go the Service Counter to speak to a Service Specialist. Our address is 196 Lexington St, Woburn, MA 01801.


Simply fill out the short form below to be contacted by a Service Specialist. Please let us know what service you need and your vehicle.


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Lawless Chrysler Dodge Jeep Ram 42.468080, -71.177560.