SES LIGHT - FALSE CODE 45 (DIAGNOSE/REPLACE PROM)

SUBJECT: SERVICE ENGINE SOON LIGHT-FALSE CODE 45

MODEL and YEAR: 1992 CAPRICE WITH 4.3L ENGINE (VIN Z - RPO LB4)

ENGINE APPLICATIONS: 4.3L (LB4) ------------------- ENGINE VIN: Z ---------- SUBJECT: Service Engine Soon Light - False Code 45 ------- VEHICLE APPLICATIONS: 1992 Model Year B Cars -------------------- CONDITION: --------- Some owners of 1992 model year B cars with 4.3L (RPO LB4) engines may comment on a service engine soon light-Code 45 - oxygen sensor (02) rich. The vehicle does not exhibit any driveability symptoms.

CAUSE:

----- The original calibration sets a false code 45.

CORRECTION:

---------- 1. Perform the normal diagnostics per section 6E of the service manual.

2. If no problems are found using these diagnostic procedures replace the PROM (programmable read only memory) with the following GMSPO part:

Broadcast Scanner GMSPO P/N Code I.D. --------- --------- ------- 16191686 BFKF 1711

Parts are expected to be available on March 8, 1993.

WARRANTY INFORMATION:

Labor Operation: T0500

Labor Time: 0.5 hour

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.