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EmissionsMinor✅ DIY Friendly

P0145

O2 Sensor Circuit Slow Response Bank 1 Sensor 3

The Bank 1 Sensor 3 oxygen sensor is switching between rich and lean too slowly.

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

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Test sensor switching speed with scan tool
  • Step 2:Inspect for exhaust leaks
  • Step 3:Replace sensor if response is slow
💡 Pro Tip: O2 sensors naturally slow down with age and mileage - a slow response code on an older sensor usually just means it's due for replacement.

Repair Cost Estimate

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

Frequently Asked Questions

What does OBD2 code P0145 mean?+
P0145 stands for O2 Sensor Circuit Slow Response Bank 1 Sensor 3. The Bank 1 Sensor 3 oxygen sensor is switching between rich and lean too slowly.
What causes code P0145?+
Aging or contaminated O2 sensor; Exhaust leak; Fuel contamination
How do I fix code P0145?+
Test sensor switching speed with scan tool; Inspect for exhaust leaks; Replace sensor if response is slow
How much does it cost to fix P0145?+
Estimated repair cost for P0145 is $100-$350.
Is P0145 DIY-friendly?+
Yes — P0145 is generally DIY-friendly with basic tools.

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