Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1997ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSENGINE CONTROLS - REVISED HO2S COMPONENT LOCATION TABLE
1997 Chevrolet Astro Van 2WD V6-4.3L VIN W
Engine Controls - Revised HO2S Component Location Table
1997 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Engine Controls - Revised HO2S Component Location Table
71-65-35
CHEVROLET
Issued: 04/01/97
SMU-SECTION E - ENGINE CONTROLS
SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6E - ENGINE CONTROLS REVISED HO2S REFERENCES IN COMPONENT LOCATION TABLE
MODELS:
1997 CHEVROLET AND GMC M/L MODELS WITH 4.3L ENGINE (VIN W - RPO L35)
THIS BULLETIN IS BEING ISSUED TO REVISE THE HO2S LOCATIONS FOUND ON PAGE 6E-34 IN THE 1997 M/L VAN SERVICE MANUAL, BOOK 2 OF 2. THE REVISED HO2S LOCATIONS ARE AS F9LLOWS:
BANK 1 SENSOR 1 - LEFT FRONT EXHAUST Y-PIPE
BANK 2 SENSOR 1 - RIGHT FRONT EXHAUST Y-PIPE
BANK 1 SENSOR 2 - JUST FORWARD OF THE THREE WAY CATALYTIC CONVERTER
BANK 1 SENSOR 3 - EXHAUST PIPE BETWEEN THE THREE WAY CATALYTIC
CONVERTER AND MUFFLER
CHEVROLET
Issued: 04/01/97
SMU-SECTION E - ENGINE CONTROLS
SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6E - ENGINE CONTROLS REVISED HO2S REFERENCES IN COMPONENT LOCATION TABLE
MODELS:
1997 CHEVROLET AND GMC M/L MODELS WITH 4.3L ENGINE (VIN W - RPO L35)
THIS BULLETIN IS BEING ISSUED TO REVISE THE HO2S LOCATIONS FOUND ON PAGE 6E-34 IN THE 1997 M/L VAN SERVICE MANUAL, BOOK 2 OF 2. THE REVISED HO2S LOCATIONS ARE AS F9LLOWS:
BANK 1 SENSOR 1 - LEFT FRONT EXHAUST Y-PIPE
BANK 2 SENSOR 1 - RIGHT FRONT EXHAUST Y-PIPE
BANK 1 SENSOR 2 - JUST FORWARD OF THE THREE WAY CATALYTIC CONVERTER
BANK 1 SENSOR 3 - EXHAUST PIPE BETWEEN THE THREE WAY CATALYTIC
CONVERTER AND MUFFLER
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.