TorqueMech Beta
TorqueMech OBD Code Guide

P0137 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Downstream O2 sensor signal voltage low (B1S2).

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Code Meaning

Downstream O2 sensor signal voltage low (B1S2).

Common Causes

O2 sensor failure
Wiring issue
Exhaust leak
Lean condition

Quick Checks

  • Inspect exhaust for leaks
  • Inspect sensor wiring
  • Verify activity on scan tool

Likely Repairs

Use test results to confirm the fault before pricing the repair.

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Related Codes

P0420
Catalyst Efficiency Below Threshold (Bank 1)
Open ->
P0430
Catalyst Efficiency Below Threshold (Bank 2)
Open ->
P0138
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
Open ->
P0140
O2 Sensor Circuit No Activity (Bank 1 Sensor 2)
Open ->

Next Steps

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