P0140Medium Priority
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
Category: Powertrain• Fuel and Air Metering
12 articles · 1 makes affected
What is P0140?
Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 2). The downstream O2 sensor shows no activity, indicating sensor failure or wiring issues.
Symptoms You May Notice
- ●Check engine light
- ●Failed emissions test
- ●Possible catalytic converter issues
How to Fix It
- ●Replace downstream O2 sensor ($100-$300, intermediate)
- ●Check sensor wiring ($50-$200, beginner)
- ●Repair exhaust leak ($150-$500, intermediate)
Owner Statistics
Based on 1,901 real owner discussions • 105 confirmed solutions
$31,749
Average Repair Cost
6%
Success Rate
14%
DIY Repairs
1,901
Data Sources
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
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