B2871 Code - Left Rear Tire Pressure Sensor Fault
Quick Answer
The B2871 code indicates a fault with the left rear tire pressure sensor in a vehicle's tire pressure monitoring system (TPMS). Common causes include Faulty left rear tire pressure sensor, Corroded or damaged wiring/connectors leading to the sensor, TPMS control module malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B2871 indicates Left Rear Tire Pressure Sensor Fault.
- Common causes
- Common causes include Faulty left rear tire pressure sensor, Corroded or damaged wiring/connectors leading to the sensor, TPMS control module malfunction.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B2871 Description
The B2871 code indicates a fault with the left rear tire pressure sensor in a vehicle's tire pressure monitoring system (TPMS). The TPMS is designed to monitor the air pressure in each tire and alert the driver if there is a significant deviation from the recommended pressure levels. A fault in the left rear tire pressure sensor can lead to inaccurate readings or a complete loss of communication with the sensor, potentially affecting the vehicle's handling, traction, and overall safety.
Common Causes of B2871
- Faulty left rear tire pressure sensor
- Corroded or damaged wiring/connectors leading to the sensor
- TPMS control module malfunction
- Low battery in the tire pressure sensor
- Physical damage to the sensor from road debris or impacts
Symptoms of B2871
- TPMS warning light illuminated on the dashboard
- Inaccurate tire pressure readings displayed on the instrument cluster
- Loss of communication with the left rear tire pressure sensor
- Fluctuating tire pressure readings while driving
How to Fix B2871
- Use a TPMS diagnostic tool to identify the specific cause of the fault with the left rear tire pressure sensor.
- Inspect the sensor, wiring, and connectors for any visible damage or corrosion. Replace or repair as necessary.
- Reset the TPMS system and reprogram the left rear tire pressure sensor to ensure proper communication with the control module.
- Test drive the vehicle to verify that the TPMS warning light is no longer illuminated and that accurate tire pressure readings are displayed.
- Clear the diagnostic trouble codes (DTCs) from the vehicle's computer system to complete the repair process.
Cost to Fix B2871
The typical repair costs for addressing a left rear tire pressure sensor fault can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. Keep in mind that prices can vary based on factors such as location, vehicle make and model, and the repair shop's hourly labor rates. It is recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's specific needs.
Tech Notes for B2871
Need more information about the B2871 code?
Need more information on how to fix the B2871 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B2871 code diagnosed by a professional: Find a repair shop in your area
Code B2871 Information for Specific Makes
- B2871 Ford — Left Rear Tire Pressure Sensor Fault
- B2871 Lincoln — Left Rear Tire Pressure Sensor Fault
- B2871 Mercury — Left Rear Tire Pressure Sensor Fault
Frequently Asked Questions about B2871 Code
1. What does the OBDII code B2871 mean?
The code B2871 indicates a fault with the left rear tire pressure sensor, often related to a malfunction, communication issue, or low battery in the sensor.
2. What are the common symptoms of a B2871 code?
Symptoms may include a tire pressure warning light on the dashboard, inaccurate tire pressure readings, or no data displayed for the left rear tire.
3. What causes the B2871 code to appear?
Common causes include a faulty tire pressure sensor, a weak or dead sensor battery, damaged wiring, or interference with the sensor signal.
4. Can I drive with a B2871 code?
Yes, you can drive, but it’s important to manually check your tire pressure to ensure safety, as the left rear tire pressure sensor may not provide accurate readings.
5. How is the B2871 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the left rear tire pressure sensor, check for sensor signal strength, and examine the wiring and connections.
6. How do you fix a B2871 code?
Repairs may involve replacing the faulty left rear tire pressure sensor, reprogramming the sensor, or repairing any damaged wiring or connections.
7. How much does it cost to fix a B2871 code?
The cost varies, but replacing a tire pressure sensor typically ranges from $50 to $150 for the part, plus labor costs.
8. Can a low battery in the tire pressure sensor cause a B2871 code?
Yes, a weak or dead sensor battery is a common cause of this code and may require sensor replacement.
9. Do I need to reprogram the sensor after replacing it?
Yes, most tire pressure sensors require reprogramming or relearning using a scan tool to ensure proper communication with the vehicle.
10. Could extreme weather trigger a B2871 code?
Yes, extreme cold or heat can sometimes affect sensor functionality or battery performance, potentially triggering this code.
Discuss the causes and fixes for B2871 OBDII Code
Code B2871 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.