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P0136

O2 Sensor Circuit Malfunction Bank 1 Sensor 2

Downstream O2 sensor (after catalytic converter) on Bank 1 has a circuit fault.

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

⚡ Common Causes

  • ›Faulty downstream O2 sensor
  • ›Damaged wiring
  • ›Failed catalytic converter
  • ›Exhaust leak after cat

⚠️ Symptoms

  • ›Check engine light
  • ›Possible failed emissions test
  • ›No noticeable driveability issue usually

✅ How to Fix — Step by Step

  • Step 1:Check sensor wiring and connector
  • Step 2:Test sensor voltage
  • Step 3:Replace downstream O2 sensor
  • Step 4:Check catalytic converter efficiency

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0136 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Downstream O2 sensors mainly monitor catalytic converter health — driveability is rarely affected.

Repair Cost Estimate

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

Frequently Asked Questions

What does OBD2 code P0136 mean?+
P0136 stands for O2 Sensor Circuit Malfunction Bank 1 Sensor 2. Downstream O2 sensor (after catalytic converter) on Bank 1 has a circuit fault.
What causes code P0136?+
Faulty downstream O2 sensor; Damaged wiring; Failed catalytic converter; Exhaust leak after cat
How do I fix code P0136?+
Check sensor wiring and connector; Test sensor voltage; Replace downstream O2 sensor; Check catalytic converter efficiency
How much does it cost to fix P0136?+
Estimated repair cost for P0136 is $100–$350.
Is P0136 DIY-friendly?+
Yes — P0136 is generally DIY-friendly with basic tools.

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