6.2L LS3 V8 · Exhaust
Oxygen sensor
Tightening procedure
- Torque 30 lb-ft · 41 N·m
Tools
- socket
Notes
Two upstream, two downstream. The LS3 O2 sensor part numbers are 12581966 (upstream) and 12611165 (downstream) per figure 1Y03-095 of the 2011 GM Professional Parts Catalog. Torque spec is not in the parts catalog — typical GM HO2S torque is 30-40 N·m (22-30 lb·ft) per industry standard; verify against GM SI document 2296270 for the LS3-specific value before relying on it. GM SI "Heated Oxygen Sensor (HO2S)" 41 N·m (30 lb·ft) per fastener spec doc 1964256 (Engine Exhaust). The companion doc 1709008 lists 42 N·m / 30 lb·ft — equivalent given measurement rounding. Applies to upstream and downstream HO2S positions on LS3.
Sources
- 2011 Chevrolet Corvette Parts Catalog (GM Professional, Dec-11 supersedes May-11)
- GM Service Information: Fastener Specifications (Engine Exhaust), Document ID 1964256
Values are cited as facts. We do not reproduce the manufacturer's prose, table layout, or diagrams.