Check Engine Light Code Diagnostic?

Let the experts at T&K check this out for FREE!

When your check engine light turns on, your vehicle is giving you a heads up that something is about to go wrong. The vehicle does this by recording a series of 1 to 9 six digit code or information on the problem. This code lookup requires a hand held computer or scanner to be plugged into the car's computer system to read and diagnose the series of codes. Yes, the engine light can be turned off.

When you ignore a check engine light you risk:

  • Further engine or transmission damage
  • Poor gas mileage
  • Vehicle performance problems
  • Serious repair cost

There are three common and very useful computerized tools used by T&K that can assist you in diagnosing your vehicle and turn off the check engine light:

  • A Scan Tool can be used to read and erase trouble codes, display, record and play back LIVE diagnostic data and perform other tests allowed by the vehicle maker. We have scan tools that cover vehicles 1982 to present depending on required coverage.
  • A Code Reader can be used to read and erase diagnostic trouble codes as well as other additional features depending on the tool. These tools work on all vehicles 1996 and newer.
  • A Code Scanner reads diagnostic trouble codes generated by the vehicle's system. Codes are displayed on the vehicle's dashboard and/or identified through audio prompts. These products work with 1981-1995 vehicles.


Irving transmission diagnosis and repairAll modern vehicles are equipped with an onboard computer diagnostic system (OBDII or OBD 2) that constantly monitors your vehicle's major operating systems and most importantly the power-train (engine and transmission). The main purpose of monitoring these systems is to insure that the vehicle is operating at top efficiency with the lowest possible emissions. As fuel economy and emission control has become increasingly important and complex, your vehicle's electronics systems need to constantly adjust and fine-tune various parameters according to driving conditions (such as vehicle load, temperature, and air/fuel mix to name just a few). When the computer reads that any of these parameters do not fall within the acceptable range for operating the vehicle, your CHECK ENGINE LIGHT is lit to warn you that you may have a serious problem and to take your vehicle to a certified technician - such as your local T&K technician - to check the faults and restore it to manufacturer's specifications.

OBD2 Codes Explained

OBD-II codes consist of a number of parts. Here is a sample OBD2 code: P0171

Here is a breakdown of what each digit of the code means:

First Character - System

The first character identifies identifies the system related to the trouble code.

P = Powertrain
B = Body
C = Chassis
U = Undefined

Second Digit - Code Type

The second digit identifies whether the code is a generic code (same on all OBD-II equpped vehicles), or a manufacturer specific code.

0 = Generic (this is the digit zero -- not the letter "O")
1 = Enhanced (manufacturer specific)

Third Digit - Sub-System

The third digit denotes the type of sub-system that pertains to the code

1 = Emission Management (Fuel or Air)
2 = Injector Circuit (Fuel or Air)
3 = Ignition or Misfire
4 = Emission Control
5 = Vehicle Speed & Idle Control
6 = Computer & Output Circuit
7 = Transmission
8 = Transmission
9 = SAE Reserved
0 = SAE Reserved

Fourth and Fifth Digits

These digits, along with the others, are variable, and relate to a particular problem. For example,a P0171 code means P0171 - System Too Lean (Bank 1).

And these are just a few of the hundreds of codes, causes, and symptoms. Each has multiple fixes and requires a scan tool or computer to read them. At T&K, we use up todate, professional Scan Tools and Code Readers that are designed to communicate with cars and light-duty trucks which comply with US emission standards.

So come by today for a Free Check Engine Light Check reading and diagnostic. You will then have the facts.

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T&K in Irving
1100 W. LBJ Fwy. #100
Irving, TX 75063

(214) 753-8611

T&K in Addison
15200 Marsh Lane
Addison, TX 75001

(972) 241-8833