For 1990-2009 cars

# INFO. ON PICTORIAL OF OXYGEN SENSOR DESIGNATIONS

#### SUBJECT: INFORMATION ON PICTORIAL OF OXYGEN SENSOR DESIGNATIONS IN VARIOUS EXHAUST SYSTEMS CONFIGURATIONS

#### MODELS: 1996-97 PASSENGER CARS, GEOS AND TRUCKS

THE FOLLOWING ARE PICTORIALS OF THE DESIGNATION OF OXYGEN SENSORS IN GENERAL MOTORS VEHICLES.

THERE HAS BEEN SOME CONFUSION RELATIVE TO OBD II OXYGEN SENSOR DESIGNATION. THE INTENT OF THIS BULLETIN IS TO ELIMINATE MISDIAGNOSIS OF THOSE OXYGEN SENSORS DUE TO MISIDENTIFICATION. WHEN USING SECTION 6E OF THE SERVICE MANUAL, THIS CHART CAN HELP LOCATE THE APPROPRIATE BANK AND SENSOR FOR THE DIAGNOSTIC.

FOR "V" ENGINES; BANK 1 IS ALWAYS ON THE SIDE OF THE ENGINE WITH THE NUMBER 1 CYLINDER (ODD CYLINDERS), AND BANK 2 IS ALWAYS ON THE SIDE OF THE ENGINE WHERE THE NUMBER 2 CYLINDER (EVEN CYLINDERS) IS LOCATED.

JUST A REMINDER, THE OBD II P-CODES, TECHNICIAN OBSERVATIONS AND CUSTOMER COMMENTS ARE ALL TO BE RECORDED ON THE REPAIR ORDER IN ACCORDANCE WITH ARTICLE 1.6.2G OF THE GM SERVICE POLICIES AND PROCEDURES MANUAL.

USE THE APPROVED LABOR OPERATION FOR THE SENSORS REPLACED. J6372 IS USED FOR ENGINE OUT SENSORS. LABOR OPERATION J6380 IS FOR THE PRE- SENSOR (THE SENSOR JUST IN FRONT OF THE CATALYTIC CONVERTER) AND THE POST SENSOR (THE SENSOR BEHIND THE CATALYTIC CONVERTER).

FIGURES: 6 ATTACHMENTS: 0

FRONT OF VEHICLE FIGURE 1 1.- BANK 2 SENSOR 1 2.- BANK 1 SENSOR 3 3.- BANK 1 SENSOR 2 4.- BANK 1 SENSOR 1 5.- CYLINDER 1 CAR: L36 (F CAR ONLY) TRUCK: L35, LF6, L30

FIGURE 2 1 - BANK 2 SENSOR 1 2.- CYLINDER #1 3.- BANK 1 SENSOR 1 4.- BANK 1 SENSOR 3 5.- BANK 1 SENSOR 2 CAR: L47, L37, LD8

FIGURE 3 1 - CYLINDER #1 (L36, L67) 2 - CYLINDER #1 (L82, LA1) 3.- BANK 1 SENSOR 2 4.- BANK 1 SENSOR 1 CAR: L82, L36 (C, G, H, W, U), L67, LA1

FIGURE 4 1.- BANK 1 SENSOR 2 2.- BANK 1 SENSOR 1 3.- CYLINDER #1 CAR: LD9, LL0, L24, LP2, L01 TRUCK: LN2

FIGURE 5 - BANKED SEQUENTIAL FUELED ENGINE 1.- BANK 2 SENSOR 1 2.- BANK 1 SENSOR 2 3.- BANK 2 SENSOR 2 4.- BANK 1 SENSOR 1 5 - CYLINDER #1 C/K L31 LIGHT DUTY AUTOMTICS AND MANUAL TRANSMISSION

FIGURE 6 - BANKED SEQUENTIAL FUELED ENGINE 1.- BANK 2 SENSOR 1 2.- BANK 2 SENSOR 2 3.- BANK 1 SENSOR 2 4.- BANK 1 SENSOR 1 5 - CYLINDER #1 TRUCK: C/K L31 + L29 HEAVY DUTY, G VAN L31 + L29 LIGHT + HEAVY DUTY, P TRUCK L31 + L29 CAR: LS1, LT1, L99, LT4

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.

COPYRIGHT 1997. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.