What Is the On-Board Diagnostics (OBD) System?

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Your car contains a vast number of different systems, all of which must work in harmony to ensure proper operation. There must be a way to monitor your ignition and emissions systems and the On-Board Diagnostics (OBD) is a computer that keeps tabs on what’s going on with your vehicle.

What the OBD system does

Simply stated, the OBD system is an on-board computer that communicates with other systems, including the ECU, TCU and more. It monitors the performance of your ignition system, engine performance, transmission operation, emissions system operation and more. Based on feedback from sensors around the vehicle, the OBD system determines if everything is working properly, or if something is beginning to go wrong. It’s advanced enough to warn drivers before a serious problem occurs, often at the first symptom of a failing component.

When the OBD system identifies an issue, it turns on a warning light in the dash (generally, the Check Engine Light), and then stores a trouble code (called a DTC, or diagnostic trouble code). A mechanic can connect a scan tool to the OBD II connector under the dash and read this code. This provides the information needed to begin the diagnostic process. Note that reading a code does not necessarily mean that the mechanic knows immediately what has gone wrong, but that the mechanic has a place to begin looking.

As a note, the OBD system also determines whether your car will pass emissions testing. If the Check Engine Light is on, your car won’t pass the test. There’s also a chance that it won’t pass even if the Check Engine Light is not on.


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Jason

31 years of experience
148 reviews
Jason
31 years of experience
Land Rover Range Rover Sport - Brake Pads Replacement (Front, Rear) - Surprise, Arizona
Needed new brake pads on my Land Rover-and booked through “your mechanic”- this was my second time using this service and I have to say- these guys are awesome- Today, Jason came out to my work place- and completed the work quickly. Thank you!!
Honda Accord - Brake Pads Replacement (Rear) - Phoenix, Arizona
Jason was on time, self motivated, well educated in his craft, and very helpful. I am fully sold on your method of using the home service. Jason helped by creating a safer ride for my wife, saving me time, and saving money for my family. I will be a client forever. Dennis Laycock

Lee

18 years of experience
105 reviews
Lee
18 years of experience
Toyota Camry - Brake Pads Replacement (Rear) - Richmond, Virginia
Lee was professional and knowledgeable. The job did not take long he was a little late but like I said professional because he let know that he was running late. LEE IS AWESOME!!!!!!

Willie

23 years of experience
23 reviews
Willie
23 years of experience
Jeep Compass - Brake Pads Replacement (Front, Rear) - North Hollywood, California
I made an appointment to have my brake rotors/disc replaced. On the day I scheduled my car services- it ended up raining. Willie checked in, moved my appointment, and continued to communicate through out the day until he was able to come work on my car. He took great car to make the repairs ANNNDDD SAVED ME MONEY by only doing what was necessary (only one of the rotors needed replacing). A blessing.

Honorio

18 years of experience
782 reviews
Honorio
18 years of experience
Saturn Vue - Brake Pads Replacement (Front) - Sunnyvale, California
This was our second appointment to service our Honda and Saturn with Honorio and we will continue to do so in the future. We highly recommend Honorio.

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