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2010 GMC TERRAIN
2.4L I4•FWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor547Torque2316Fluid6DTC941Battery1Maintenance0Recalls3
P1153moderate severityPowertrain

HO2S Insufficient Switching Bank 2 Sensor 1

on 2010 GMC Terrain 2.4L I4 · FWD

What this code means

The PCM determined that the upstream O2 sensor on Bank 2 is not switching between rich and lean often enough during closed-loop operation. This is the Bank 2 counterpart to P1133 and the two codes are frequently seen together.

Symptoms

  • Check Engine Light
  • Poor fuel economy
  • Rough idle
  • Hesitation
  • Failed emissions test

Common causes

  • Faulty or lazy upstream O2 sensor Bank 2
  • Exhaust leak near sensor
  • Vacuum leak
  • Fuel delivery issue
  • MAF sensor contamination

Diagnostic steps

  1. Monitor O2 sensor switching rate with scan tool
  2. Check for exhaust leaks
  3. Perform vacuum leak test
  4. Test fuel pressure
  5. Clean or test MAF sensor

Repair notes

Replace upstream O2 sensor Bank 2. Check for exhaust leaks. Commonly appears alongside P1133.

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Other Powertrain codes on this vehicle

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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