O2 Sensor - Bank 1 Downstream
1972 Dodge Challenger · 400ci V8
Sensor Type
not-applicable
Waveform Type
not-applicable
Location
Not equipped - 1972 Dodge Challenger has no catalytic converters or post-cat oxygen sensors
Pins
Unknown
Timebase
N/A
Voltage Scale
N/A
Trigger
N/A
Wiring
N/A - No emissions feedback system
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0V to 0V
Expected Pattern
Not applicable - no catalytic converter or post-cat monitoring
Known-Good Waveform
The 1972 Dodge Challenger 400ci V8 exhausts directly through manifolds, head pipes, and mufflers with no catalytic converters or oxygen sensors. Downstream O2 sensors for catalyst monitoring were not introduced until OBD-II in 1996.
Common Failure Patterns
No sensor present on this vehicle
Cause: Pre-emissions control era vehicle without catalytic converters
Diagnostic Tips
Exhaust system diagnostics focus on mechanical condition: check for manifold cracks, exhaust leaks at gaskets and pipes, and proper heat riser valve operation. Listen for rattling baffles in mufflers.
Related Diagnostic Trouble Codes
P0136P0137P0138P0139P0140
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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