Check-Engine Light-Powertrain Control Module
By GREG ZYLA

Q: Greg, is there a device that will allow me to check my engine's trouble messages so I don't have to take my car to the garage whenever the checkengine light comes on? -Pete in Florida

A: Yes, Pete, there is. Your car's engine and transmission management system is what controls your car engine, transmission and emissions systems, and it's called a Powertrain Control Module. When the PCM detects a malfunction in the monitoring system, the "Service Engine Soon" light comes on.

A computer scanner can read the trouble codes to inform you on the particular sensor that has failed. The most frequent is the "02 sensor" (oxygen sensor), which is an item that looks like a clothespin with wires and should be replaced every 60,000 to 90,000 miles.

If you would like, you can scan your On Board Diagnostics system for fault codes with a engine scanner from PocketScan ($69.95 at eAutoElectronics.com). This handheld scanner pinpoints information in the malfunctioning system to help you correctly replace the sensor or valve needed for the repair, and eliminate any "hit and miss" do-it-yourself repair.

This device enables the user to read OBD II diagnostic trouble codes from the on-board computers of 1996 and newer cars and light trucks to quickly determine the cause of the "Check Engine"

light coming on. Once repairs are made, the PocketScan permits the user to clear the trouble codes and turn off the light. Check it out on the Web or call 1-800889-8675 for more information. Write to Greg Zyla in care of

King Features Weekly Service, P.O. Box 536475, Orlando, FL32853-6475, or send an e-mail to letters.kfws@hearstsc.com.

(c) 2006 King Features Synd., Inc.