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981 · Exhaust

P0137

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

LOW SEVERITY

Downstream Bank 1 sensor stuck low.

SYMPTOMS

  • Check-engine light

LIKELY CAUSES

  • Failed rear sensor
  • Wiring fault
  • Exhaust leak

DIAGNOSIS STEPS

  • View rear-sensor live data
  • Check wiring
  • Inspect exhaust
  • Replace sensor

RELATED PARTS

  • Downstream O2 sensor
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