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P0137

O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

Downstream O2 sensor on Bank 1 reading consistently low voltage.

SeverityMinor
CategoryEmissions
Est. Repair Cost$100–$350
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Faulty downstream sensor
  • ›Exhaust leak after catalyst
  • ›Catalytic converter failure
  • ›Lean exhaust gases

⚠️ Symptoms

  • ›Check engine light
  • ›Failed emissions test
  • ›Usually no driveability complaint

✅ How to Fix — Step by Step

  • Step 1:Check for exhaust leaks after cat
  • Step 2:Test downstream sensor voltage
  • Step 3:Replace downstream O2 sensor
  • Step 4:Test catalytic converter efficiency

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0137 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: P0137 combined with P0420 usually means catalytic converter replacement is needed.

Repair Cost Estimate

Full Repair Estimate
$100–$350
DIY Possible?
YES
Severity
Minor

Frequently Asked Questions

What does OBD2 code P0137 mean?+
P0137 stands for O2 Sensor Circuit Low Voltage Bank 1 Sensor 2. Downstream O2 sensor on Bank 1 reading consistently low voltage.
What causes code P0137?+
Faulty downstream sensor; Exhaust leak after catalyst; Catalytic converter failure; Lean exhaust gases
How do I fix code P0137?+
Check for exhaust leaks after cat; Test downstream sensor voltage; Replace downstream O2 sensor; Test catalytic converter efficiency
How much does it cost to fix P0137?+
Estimated repair cost for P0137 is $100–$350.
Is P0137 DIY-friendly?+
Yes — P0137 is generally DIY-friendly with basic tools.

AI Diagnosis

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