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 SYSTEMSOXYGEN SENSORLOCATIONSCOMPONENT LOCATIONSTECHNICAL SERVICE BULLETIN UPDATE
1997 Chevrolet Astro Van 2WD V6-4.3L VIN W
Technical Service Bulletin Update
1997 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Technical Service Bulletin Update
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 67-65-40
Date: March, 1997
INFORMATION
Subject:
Pictorial of Oxygen Sensor Designations in Various Exhaust Systems Configurations
Models:
1996-97 Passenger Cars, Geos and Trucks
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 mis-identification. 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. J 6372 is used for engine out sensors. Labor Operation J 6380 is for the pre-sensor (the sensor just in front of the catalytic converter) and the post sensor (the sensor behind the catalytic converter).
Bulletin No.: 67-65-40
Date: March, 1997
INFORMATION
Subject:
Pictorial of Oxygen Sensor Designations in Various Exhaust Systems Configurations
Models:
1996-97 Passenger Cars, Geos and Trucks
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 mis-identification. 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. J 6372 is used for engine out sensors. Labor Operation J 6380 is for the pre-sensor (the sensor just in front of the catalytic converter) and the post sensor (the sensor behind the catalytic converter).
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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.