Can I drive with a faulty occupant sensor?

A faulty occupant sensor may cause the passenger airbag to be disabled. While the vehicle is still drivable, the passenger airbag will not deploy in a crash. Have it repaired promptly.

Why is my fuel gauge reading incorrectly?

The most common cause is a failing fuel level sending unit inside the fuel tank. The float or resistor can wear out, causing erratic or stuck readings. Replacement costs $200-$500 including labor.

B0181

Parking Sensor Circuit Malfunction - Rear

Lowsensor

Overview

The B0181 diagnostic trouble code indicates that the body control module has identified a parking sensor circuit malfunction - rear issue. This code means a body sensor or its circuit is not providing expected readings. Accurate sensor data is important for proper operation of safety and convenience systems throughout the vehicle.

Symptoms

Window pinch protection not functioning
Parking sensors not detecting obstacles
Blind spot monitoring warning not appearing
Auto-dimming mirror not responding to light changes

Common Causes

Faulty impact or occupancy sensor
Sensor out of calibration
Fuel level sending unit failure
Corroded sensor connections

Diagnosis Steps

1Connect an OBD-II scanner and read all stored body control module trouble codes
2Inspect the affected sensor and its wiring connector for damage or corrosion
3Test the sensor resistance or voltage output with a multimeter
4Check for physical obstructions, contamination, or misalignment of the sensor
5Verify sensor calibration using scan tool where applicable

Estimated Repair Cost

$50 — $400

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Hyundai TucsonFord EscapeHonda CR-VMazda3

Related Codes

B0030 B0050 B0028

More Sensor Codes

P0070Ambient Air Temperature Sensor Circuit

Low

P0071Ambient Air Temperature Sensor Range/Performance

Low

P0072Ambient Air Temperature Sensor Circuit Low

Low

P0073Ambient Air Temperature Sensor Circuit High

Low

P0074Ambient Air Temperature Sensor Circuit Intermittent

Low

P0095Intake Air Temperature Sensor 2 Circuit

Low

Frequently Asked Questions

A stuck or misaligned door ajar switch is the most common cause. The switch is located in the door latch mechanism and can be cleaned or replaced for $20-$100.