INFO. ON HEATED OXYGEN SENSOR

SUBJECT: INFORMATION ON HEATED OXYGEN SENSOR

MODELS: 1998 CHEVROLET AND GMC M/L MODELS 1998 EXPORT WITH 4.3L ENGINE (VIN W--RPO L35)

THE 1998 CHEVROLET AND GMC M/L MODELS USE A UNIQUE HEATED OXYGEN SENSOR RELEASED FOR THEIR MODEL YEAR/VEHICLE APPLICATION ONLY.

ALL CHEVROLET AND GMC M/L MODELS ARE BUILT WITH THE PROPER HEATED OXYGEN SENSORS.

THE USE OF ANY OTHER HEATED OXYGEN SENSOR FOR SERVICE, IN 1998 M/L APPLICATIONS, MAY SET THE FOLLOWING DIAGNOSTIC TEST CODES:

DTC P0135--02 SENSOR HEATER CKT., BANK 1, NO. 1 DTC P0147--02 SENSOR HEATER CKT., BANK 1, NO. 3 DTC P0155--02 SENSOR HEATER CKT., BANK 2, NO. 1

DRIVEABILITY SYMPTOMS, DUE TO INCORRECT HEATED OXYGEN SENSOR USAGE, MAY NOT BE EVIDENT.

THE CORRECT M/L VAN HEATED OXYGEN SENSOR CAN BE IDENTIFIED BY THE FOLLOWING (SEE FIGURE 1--HEATED OXYGEN SENSOR IDENTIFICATION):

1 -- TYPICAL PRE-CONVERTER HEATED OXYGEN SENSOR 2 -- TYPICAL POST-CONVERTER HEATED OXYGEN SENSOR 3 -- 1998 M/L VAN HEATED OXYGEN SENSOR, PRE AND POST CONVERTER LOCATIONS 4 -- LOCATION OF STAMPED PART NUMBER

THE HEATED OXYGEN SENSOR, FOR 1998 M/L VAN APPLICATIONS, SHOULD NOT BE USED IN ANY OTHER VEHICLE APPLICATION. INCORRECT OXYGEN SENSOR READINGS WILL RESULT.

CHECK THE CURRENT GMSPO CATALOGUE FOR THE CORRECT HEATED OXYGEN SENSOR PART NUMBER.

FIGURES: 1 ATTACHMENTS: 0

FIGURE 1 LEGEND - HEATED OXYGEN SENSOR IDENTIFICATION 1 -- TYPICAL PRE-CONVERTER HEATED OXYGEN SENSOR 2 -- TYPICAL POST-CONVERTER HEATED OXYGEN SENSOR 3 -- 1998 M/L VAN HEATED OXYGEN SENSOR, PRE AND POST CONVERTER LOCATIONS 4 -- LOCATION OF STAMPED PART NUMBER

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

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