P0143
O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
P0143 is an OBD-II diagnostic trouble code meaning: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3. Common causes: open or short circuit in the sensor wiring harness, oxygen sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Unstable engine operation
- Check Engine light comes on
- Increased emissions of harmful substances
Causes
- Open or short circuit in the sensor wiring harness
- Oxygen sensor malfunction
- Poor grounding of the sensor circuit
- Problems with the ECU
How to Fix
- Check the integrity of the sensor wiring harness
- Check sensor connections and grounding
- Replace the oxygen sensor if necessary
- Check the operation of the computer
Related codes
Error P0143 by Vehicle Brand
FAQ
What does the P0143 code mean?
P0143 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
What causes a P0143 error code?
The most common causes of P0143 include: Open or short circuit in the sensor wiring harness; Oxygen sensor malfunction; Poor grounding of the sensor circuit; Problems with the ECU.
How do I fix a P0143 diagnostic trouble code?
To fix P0143: Check the integrity of the sensor wiring harness. Check sensor connections and grounding. Replace the oxygen sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0143?
Limited driving only, diagnose soon
How much does it cost to fix P0143?
The estimated repair cost for P0143 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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