How to Use DIY OBD2 Code Scanner

Diagnose car problems without going to a mechanic with an auto code
reader. Simply plug it into the car's computer system, then interpret
the trouble code readout.

Nothing can knock your day off track
faster than a “Check Engine” light popping up on your dash. You wonder
if you should pull over and shut off your vehicle or drive right to a
shop. An OBD2 Code Scanneurs can help you make the drive/no drive decision and even help you fix the
problem. It works by plugging into the car's computer system and
displaying a “trouble code.”

A code reader/scanner is worth buying
if you're a fairly competent amateur mechanic who understands how an
engine works. But it's not a silver bullet that will always tell you
exactly what's wrong. It'll give you a head start, but you'll still have
to do some detective work before you start pulling and replacing parts
(more on this later).

The least expensive units are simple code
readers that burp up an alphanumeric trouble code but no information
about what it means. You'll have to look up the code in a reference book
or search the Internet. Midpriced units actually display the problem on
the screen, like “P0115 Engine Coolant Temperature Circuit
Malfunction.” One model even accesses the Internet, so you can upload
the trouble code to a Web site that has information on the most likely
cause of the problem.

But if you're a true grease monkey, go for a
more expensive scanner. A scanner gives you real-time “live”
information so you see the same data your car's computer is seeing. That
saves you the hassle of diving under the hood (with a wiring diagram in
hand), piercing wires and taking sensor readings.

Code reading
and scanning sound simple, right? Well, there's more to it than that. A
code that indicates your oxygen sensor is “lean” can mean the sensor is
dead, or it can mean that the air/fuel mixture really is lean and you've
got either a vacuum leak or a fuel problem. How do you know? Here are
three ways to get to the root of a problem without replacing good parts. obd2 guide

Go to the code reader/scan tool manufacturer's Web site to see if it has information on your trouble code.

Take advantage of Internet forums. Just search for your car's model and
add “forum” to the search term. Register for the site (usually free)
and post your question, including your vehicle's year, mileage, code
number and what you've done so far. You'll be surprised by the number
and quality of responses you get. Subscribe to an online shop
manual. It will have not only all the carmaker's technical service
bulletins listed but also the complete diagnostic procedure for your
particular code. It will walk you through the testing procedure, telling
you which wires to check and what voltages you should see. The services
also include component locators to help you find the part in your
vehicle, and wiring diagrams showing the connector position for each
wire.

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