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2007 CADILLAC SRX

3.6L V6•AWD•AUTOMATIC•gas
1 active safety recall on this vehicle — view recalls
Repairs0Labor1000Torque4939Fluid16DTC1772Battery0Maintenance0Recalls1
P0138moderate severityPowertrain

O2 Sensor Circuit High Voltage Bank 1 Sensor 2

on 2007 Cadillac SRX 3.6L V6 · AWD

What this code means

The downstream O2 sensor on Bank 1 is reading high voltage consistently.

Symptoms

  • Check Engine Light
  • Failed emissions
  • May indicate catalyst failure

Common causes

  • Faulty sensor
  • Catalytic converter failure
  • Rich running condition

Diagnostic steps

  1. Test sensor voltage
  2. Check catalyst efficiency
  3. Monitor upstream vs downstream O2 patterns

Repair notes

Replace sensor. If catalyst failed, replace catalytic converter.

Other Powertrain codes on this vehicle

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