AutoCodeFix
🔍
EmissionsMinor✅ DIY Friendly

P0159

O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Downstream O2 sensor bank 2 is responding too slowly.

SeverityMinor
CategoryEmissions
Est. Repair Cost$100–$250
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Replace downstream O2 sensor bank 2
  • Step 2:Check for oil burning
💡 Pro Tip: Slow downstream O2 sensors are common on high mileage vehicles — replace as a set with upstream sensors at 100k miles.

Repair Cost Estimate

Full Repair Estimate
$100–$250
DIY Possible?
YES
Severity
Minor

Frequently Asked Questions

What does OBD2 code P0159 mean?+
P0159 stands for O2 Sensor Circuit Slow Response Bank 2 Sensor 2. Downstream O2 sensor bank 2 is responding too slowly.
What causes code P0159?+
Aged sensor; Oil or coolant contamination; Carbon buildup on sensor element
How do I fix code P0159?+
Replace downstream O2 sensor bank 2; Check for oil burning
How much does it cost to fix P0159?+
Estimated repair cost for P0159 is $100–$250.
Is P0159 DIY-friendly?+
Yes — P0159 is generally DIY-friendly with basic tools.

AI Diagnosis

Related Codes

P0442Evaporative Emission Control System Small Leak Detected
MinorDIY
P0455Evaporative Emission Control System Large Leak Detected
MinorDIY
P0456Evaporative Emission Control System Very Small Leak
MinorDIY
P0135O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
MinorDIY
P0141O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2
MinorDIY
P0136O2 Sensor Circuit Malfunction Bank 1 Sensor 2
MinorDIY