P0143: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
Severity
Medium
System
Fuel and Air Metering
What Does P0143 Mean?
P0143 is a diagnostic trouble code indicating: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Symptoms of P0143
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ O2 Sensor reading at zero or minimum value
- ⚠️ Related system not functioning or in fail-safe mode
- ⚠️ Poor fuel economy
Common Causes
- 🔍 Open or broken wire in O2 Sensor circuit
- 🔍 Poor ground connection at O2 Sensor
- 🔍 Faulty O2 Sensor with no output signal
- 🔍 Disconnected or loose O2 Sensor connector
- 🔍 Blown fuse in related circuit
Frequently Asked Questions
What does P0143 mean?
P0143 indicates: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3. The vehicle's computer has detected that the O2 Sensor is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P0143?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P0143 for extended periods may cause additional problems.
How much does it cost to fix P0143?
Repair costs for P0143 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.
What To Do Next
Possible Fixes
- 🔧 Repair broken wire or restore ground in O2 Sensor circuit
- 🔧 Clean and secure O2 Sensor connector and ground points
- 🔧 Replace failed O2 Sensor
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.
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